- 27 Jul, 2017 40 commits
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Wanpeng Li authored
commit 0e4097c3 upstream. Recent kernels trigger this warning: BUG: using smp_processor_id() in preemptible [00000000] code: 99-trinity/181 caller is debug_smp_processor_id+0x17/0x19 CPU: 0 PID: 181 Comm: 99-trinity Not tainted 4.12.0-01059-g2a42eb95 #1 Call Trace: dump_stack+0x82/0xb8 check_preemption_disabled() debug_smp_processor_id() vtime_delta() task_cputime() thread_group_cputime() thread_group_cputime_adjusted() wait_consider_task() do_wait() SYSC_wait4() do_syscall_64() entry_SYSCALL64_slow_path() As Frederic pointed out: | Although those sched_clock_cpu() things seem to only matter when the | sched_clock() is unstable. And that stability is a condition for nohz_full | to work anyway. So probably sched_clock() alone would be enough. This patch fixes it by replacing sched_clock_cpu() with sched_clock() to avoid calling smp_processor_id() in a preemptible context. Reported-by:
Xiaolong Ye <xiaolong.ye@intel.com> Signed-off-by:
Wanpeng Li <wanpeng.li@hotmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Luiz Capitulino <lcapitulino@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1499586028-7402-1-git-send-email-wanpeng.li@hotmail.com [ Prettified the changelog. ] Signed-off-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
Mel Gorman <mgorman@suse.de> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Greg Hackmann authored
Commit ff86bf0c ("alarmtimer: Rate limit periodic intervals") sets a minimum bound on the alarm timer interval. This minimum bound shouldn't be applied if the interval is 0. Otherwise, one-shot timers will be converted into periodic ones. This patch is specific to 4.11.y and 4.12.y. Older -stable trees have a slightly different patch, and 4.13-rc2 isn't impacted due to a later refactoring. Fixes: ff86bf0c ("alarmtimer: Rate limit periodic intervals") Reported-by:
Ben Fennema <fennema@google.com> Signed-off-by:
Greg Hackmann <ghackmann@google.com> Cc: John Stultz <john.stultz@linaro.org> Reviewed-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Thomas Gleixner authored
commit dea1d0f5 upstream. The move of the unpark functions to the control thread moved the BUG_ON() there as well. While it made some sense in the idle thread of the upcoming CPU, it's bogus to crash the control thread on the already online CPU, especially as the function has a return value and the callsite is prepared to handle an error return. Replace it with a WARN_ON_ONCE() and return a proper error code. Fixes: 9cd4f1a4 ("smp/hotplug: Move unparking of percpu threads to the control CPU") Rightfully-ranted-at-by:
Linux Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Thomas Gleixner authored
commit 9cd4f1a4 upstream. Vikram reported the following backtrace: BUG: scheduling while atomic: swapper/7/0/0x00000002 CPU: 7 PID: 0 Comm: swapper/7 Not tainted 4.9.32-perf+ #680 schedule schedule_hrtimeout_range_clock schedule_hrtimeout wait_task_inactive __kthread_bind_mask __kthread_bind __kthread_unpark kthread_unpark cpuhp_online_idle cpu_startup_entry secondary_start_kernel He analyzed correctly that a parked cpu hotplug thread of an offlined CPU was still on the runqueue when the CPU came back online and tried to unpark it. This causes the thread which invoked kthread_unpark() to call wait_task_inactive() and subsequently schedule() with preemption disabled. His proposed workaround was to "make sure" that a parked thread has scheduled out when the CPU goes offline, so the situation cannot happen. But that's still wrong because the root cause is not the fact that the percpu thread is still on the runqueue and neither that preemption is disabled, which could be simply solved by enabling preemption before calling kthread_unpark(). The real issue is that the calling thread is the idle task of the upcoming CPU, which is not supposed to call anything which might sleep. The moron, who wrote that code, missed completely that kthread_unpark() might end up in schedule(). The solution is simpler than expected. The thread which controls the hotplug operation is waiting for the CPU to call complete() on the hotplug state completion. So the idle task of the upcoming CPU can set its state to CPUHP_AP_ONLINE_IDLE and invoke complete(). This in turn wakes the control task on a different CPU, which then can safely do the unpark and kick the now unparked hotplug thread of the upcoming CPU to complete the bringup to the final target state. Control CPU AP bringup_cpu(); __cpu_up() ------------> bringup_ap(); bringup_wait_for_ap() wait_for_completion(); cpuhp_online_idle(); <------------ complete(); unpark(AP->stopper); unpark(AP->hotplugthread); while(1) do_idle(); kick(AP->hotplugthread); wait_for_completion(); hotplug_thread() run_online_callbacks(); complete(); Fixes: 8df3e07e ("cpu/hotplug: Let upcoming cpu bring itself fully up") Reported-by:
Vikram Mulukutla <markivx@codeaurora.org> Signed-off-by:
Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Sewior <bigeasy@linutronix.de> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Tejun Heo <tj@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1707042218020.2131@nanosSigned-off-by:
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Gabriel Krisman Bertazi authored
commit 9c75b185 upstream. There are still cases on these platforms where an attempt is made to configure the CDCLK while the power domain is off, like when coming back from a suspend. So the workaround below is still needed. This effectively reverts commit 63ff3044 ("drm/i915: Nuke the VLV/CHV PFI programming power domain workaround"). Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101517Suggested-by:
Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by:
Gabriel Krisman Bertazi <krisman@collabora.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170628210605.4994-1-krisman@collabora.co.ukReviewed-by:
Jani Nikula <jani.nikula@intel.com> Signed-off-by:
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sagar.a.kamble@intel.com authored
commit 04941829 upstream. OA buffer initialization involves access to HW registers to set the OA base, head and tail. Ensure device is awake while setting these. With this, all oa.ops are covered under RPM and forcewake wakelock. Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Signed-off-by:
Sagar Arun Kamble <sagar.a.kamble@intel.com> Reviewed-by:
Lionel Landwerlin <lionel.g.landwerlin@intel.com> Signed-off-by:
Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1498585181-23048-1-git-send-email-sagar.a.kamble@intel.com Fixes: d7965152 ("drm/i915: Enable i915 perf stream for Haswell OA unit") (cherry picked from commit 987f8c44) Signed-off-by:
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Chris Wilson authored
commit 7581d5ca upstream. Commit fabef825 ("drm/i915: Drop struct_mutex around frontbuffer flushes") adds a dependency to ifbdev->vma when flushing the framebufer, but the checks are only against the existence of the ifbdev->fb and not against ifbdev->vma. This leaves a window of opportunity where we may try to operate on the fbdev prior to it being probed (thanks to asynchronous booting). Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101534 Fixes: fabef825 ("drm/i915: Drop struct_mutex around frontbuffer flushes") Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170622160211.783-1-chris@chris-wilson.co.ukReviewed-by:
Tvrtko Ursulin <tvrtko.ursulin@intel.com> (cherry picked from commit 15727ed0) Signed-off-by:
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Chunyu Hu authored
commit db9108e0 upstream. Hit the kmemleak when executing instance_rmdir, it forgot releasing mem of tracing_cpumask. With this fix, the warn does not appear any more. unreferenced object 0xffff93a8dfaa7c18 (size 8): comm "mkdir", pid 1436, jiffies 4294763622 (age 9134.308s) hex dump (first 8 bytes): ff ff ff ff ff ff ff ff ........ backtrace: [<ffffffff88b6567a>] kmemleak_alloc+0x4a/0xa0 [<ffffffff8861ea41>] __kmalloc_node+0xf1/0x280 [<ffffffff88b505d3>] alloc_cpumask_var_node+0x23/0x30 [<ffffffff88b5060e>] alloc_cpumask_var+0xe/0x10 [<ffffffff88571ab0>] instance_mkdir+0x90/0x240 [<ffffffff886e5100>] tracefs_syscall_mkdir+0x40/0x70 [<ffffffff886565c9>] vfs_mkdir+0x109/0x1b0 [<ffffffff8865b1d0>] SyS_mkdir+0xd0/0x100 [<ffffffff88403857>] do_syscall_64+0x67/0x150 [<ffffffff88b710e7>] return_from_SYSCALL_64+0x0/0x6a [<ffffffffffffffff>] 0xffffffffffffffff Link: http://lkml.kernel.org/r/1500546969-12594-1-git-send-email-chuhu@redhat.com Fixes: ccfe9e42 ("tracing: Make tracing_cpumask available for all instances") Signed-off-by:
Chunyu Hu <chuhu@redhat.com> Signed-off-by:
Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by:
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Sudeep Holla authored
commit 975e83cf upstream. If the genpd->attach_dev or genpd->power_on fails, genpd_dev_pm_attach may return -EPROBE_DEFER initially. However genpd_alloc_dev_data sets the PM domain for the device unconditionally. When subsequent attempts are made to call genpd_dev_pm_attach, it may return -EEXISTS checking dev->pm_domain without re-attempting to call attach_dev or power_on. platform_drv_probe then attempts to call drv->probe as the return value -EEXIST != -EPROBE_DEFER, which may end up in a situation where the device is accessed without it's power domain switched on. Fixes: f104e1e5 (PM / Domains: Re-order initialization of generic_pm_domain_data) Signed-off-by:
Sudeep Holla <sudeep.holla@arm.com> Acked-by:
Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by:
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Philipp Zabel authored
commit 799ee297 upstream. The parallel panel driver should continue to work without having an endpoint linking to an panel in DT for backwards compatibility. With the recent switch to drm_of_find_panel_or_bridge, an absent panel results in a failure with -ENODEV error return code. To restore the old behaviour, ignore the -ENODEV return code. Reported-by:
Nikita Yushchenko <nikita.yoush@cogentembedded.com> Fixes: ebc94461 ("drm: convert drivers to use drm_of_find_panel_or_bridge") Tested-by:
Chris Healy <cphealy@gmail.com> Signed-off-by:
Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by:
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Dan Williams authored
commit bbb3be17 upstream. Fix warnings of the form... WARNING: CPU: 10 PID: 4983 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x62/0x80 sysfs: cannot create duplicate filename '/class/dax/dax12.0' Call Trace: dump_stack+0x63/0x86 __warn+0xcb/0xf0 warn_slowpath_fmt+0x5a/0x80 ? kernfs_path_from_node+0x4f/0x60 sysfs_warn_dup+0x62/0x80 sysfs_do_create_link_sd.isra.2+0x97/0xb0 sysfs_create_link+0x25/0x40 device_add+0x266/0x630 devm_create_dax_dev+0x2cf/0x340 [dax] dax_pmem_probe+0x1f5/0x26e [dax_pmem] nvdimm_bus_probe+0x71/0x120 ...by reusing the namespace id for the device-dax instance name. Now that we have decided that there will never by more than one device-dax instance per libnvdimm-namespace parent device [1], we can directly reuse the namepace ids. There are some possible follow-on cleanups, but those are saved for a later patch to simplify the -stable backport. [1]: https://lists.01.org/pipermail/linux-nvdimm/2016-December/008266.html Fixes: 98a29c39 ("libnvdimm, namespace: allow creation of multiple pmem...") Cc: Jeff Moyer <jmoyer@redhat.com> Reported-by:
Dariusz Dokupil <dariusz.dokupil@intel.com> Signed-off-by:
Dan Williams <dan.j.williams@intel.com> Signed-off-by:
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Jan Kara authored
commit 6883cd7f upstream. When new directory 'DIR1' is created in a directory 'DIR0' with SGID bit set, DIR1 is expected to have SGID bit set (and owning group equal to the owning group of 'DIR0'). However when 'DIR0' also has some default ACLs that 'DIR1' inherits, setting these ACLs will result in SGID bit on 'DIR1' to get cleared if user is not member of the owning group. Fix the problem by moving posix_acl_update_mode() out of __reiserfs_set_acl() into reiserfs_set_acl(). That way the function will not be called when inheriting ACLs which is what we want as it prevents SGID bit clearing and the mode has been properly set by posix_acl_create() anyway. Fixes: 07393101 CC: reiserfs-devel@vger.kernel.org Signed-off-by:
Jan Kara <jack@suse.cz> Signed-off-by:
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Bjorn Andersson authored
commit d50daa2a upstream. Include the OF-based modalias in the uevent sent when registering SPMI devices, so that user space has a chance to autoload the kernel module for the device. Tested-by:
Rob Clark <robdclark@gmail.com> Reported-by:
Stephen Boyd <sboyd@codeaurora.org> Signed-off-by:
Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by:
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Srinivas Pandruvada authored
commit 6e34e1f2 upstream. The busy percent calculated for the Knights Landing (KNL) platform is 1024 times smaller than the correct busy value. This causes performance to get stuck at the lowest ratio. The scaling algorithm used for KNL is performance-based, but it still looks at the CPU load to set the scaled busy factor to 0 when the load is less than 1 percent. In this case, since the computed load is 1024x smaller than it should be, the scaled busy factor will always be 0, irrespective of CPU business. This needs a fix similar to the turbostat one in commit b2b34dfe (tools/power turbostat: KNL workaround for %Busy and Avg_MHz). For this reason, add one more callback to processor-specific callbacks to specify an MPERF multiplier represented by a number of bit positions to shift the value of that register to the left to copmensate for its rate difference with respect to the TSC. This shift value is used during CPU busy calculations. Fixes: ffb81056 (intel_pstate: Avoid getting stuck in high P-states when idle) Reported-and-tested-by:
Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by:
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> [ rjw: Changelog ] Signed-off-by:
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Stephen Hemminger authored
commit 6463a457 upstream. This problem shows up in 4.11 when netvsc driver is removed and reloaded. The problem is that the channel is closed during module removal and the tasklet for processing responses is disabled. When module is reloaded the channel is reopened but the tasklet is marked as disabled. The fix is to re-enable tasklet at the end of close which gets it back to the initial state. The issue is less urgent in 4.12 since network driver now uses NAPI and not the tasklet; and other VMBUS devices are rarely unloaded/reloaded. Fixes: dad72a1d ("vmbus: remove hv_event_tasklet_disable/enable") Signed-off-by:
Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by:
K. Y. Srinivasan <kys@microsoft.com> Signed-off-by:
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Prarit Bhargava authored
commit 7e700d2c upstream. nfit_init() calls nfit_mce_register() on module load. When the module load fails the nfit mce decoder is not unregistered. The module's memory is freed leaving the decoder chain referencing junk. This will cause panics as future registrations will reference the free'd memory. Unregister the nfit mce decoder on module init failure. [v2]: register and then unregister mce handler to avoid losing mce events [v3]: also cleanup nfit workqueue Fixes: 6839a6d9 ("nfit: do an ARS scrub on hitting a latent media error") Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Len Brown <lenb@kernel.org> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: "Lee, Chun-Yi" <joeyli.kernel@gmail.com> Cc: Linda Knippers <linda.knippers@hpe.com> Cc: lszubowi@redhat.com Acked-by:
Jeff Moyer <jmoyer@redhat.com> Signed-off-by:
Prarit Bhargava <prarit@redhat.com> Reviewed-by:
Vishal Verma <vishal.l.verma@intel.com> Signed-off-by:
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Christoph Lameter authored
commit 112166f8 upstream. The reason to disable interrupts seems to be to avoid switching to a different processor while handling per cpu data using individual loads and stores. If we use per cpu RMV primitives we will not have to disable interrupts. Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1705171055130.5898@east.gentwo.orgSigned-off-by:
Christoph Lameter <cl@linux.com> Cc: Andy Lutomirski <luto@amacapital.net> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Mel Gorman <mgorman@techsingularity.net> Signed-off-by:
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Nikolay Borisov authored
commit 3e8f399d upstream. Currently the writeback statistics code uses a percpu counters to hold various statistics. Furthermore we have 2 families of functions - those which disable local irq and those which doesn't and whose names begin with double underscore. However, they both end up calling __add_wb_stats which in turn calls percpu_counter_add_batch which is already irq-safe. Exploiting this fact allows to eliminated the __wb_* functions since they don't add any further protection than we already have. Furthermore, refactor the wb_* function to call __add_wb_stat directly without the irq-disabling dance. This will likely result in better runtime of code which deals with modifying the stat counters. While at it also document why percpu_counter_add_batch is in fact preempt and irq-safe since at least 3 people got confused. Link: http://lkml.kernel.org/r/1498029937-27293-1-git-send-email-nborisov@suse.comSigned-off-by:
Nikolay Borisov <nborisov@suse.com> Acked-by:
Tejun Heo <tj@kernel.org> Reviewed-by:
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Nikolay Borisov authored
commit 104b4e51 upstream. Currently, percpu_counter_add is a wrapper around __percpu_counter_add which is preempt safe due to explicit calls to preempt_disable. Given how __ prefix is used in percpu related interfaces, the naming unfortunately creates the false sense that __percpu_counter_add is less safe than percpu_counter_add. In terms of context-safety, they're equivalent. The only difference is that the __ version takes a batch parameter. Make this a bit more explicit by just renaming __percpu_counter_add to percpu_counter_add_batch. This patch doesn't cause any functional changes. tj: Minor updates to patch description for clarity. Cosmetic indentation updates. Signed-off-by:
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Jeffrey Hugo authored
commit 65a4433a upstream. If load_balance() fails to migrate any tasks because all tasks were affined, load_balance() removes the source CPU from consideration and attempts to redo and balance among the new subset of CPUs. There is a bug in this code path where the algorithm considers all active CPUs in the system (minus the source that was just masked out). This is not valid for two reasons: some active CPUs may not be in the current scheduling domain and one of the active CPUs is dst_cpu. These CPUs should not be considered, as we cannot pull load from them. Instead of failing out of load_balance(), we may end up redoing the search with no valid CPUs and incorrectly concluding the domain is balanced. Additionally, if the group_imbalance flag was just set, it may also be incorrectly unset, thus the flag will not be seen by other CPUs in future load_balance() runs as that algorithm intends. Fix the check by removing CPUs not in the current domain and the dst_cpu from considertation, thus limiting the evaluation to valid remaining CPUs from which load might be migrated. Co-authored-by:
Austin Christ <austinwc@codeaurora.org> Co-authored-by:
Dietmar Eggemann <dietmar.eggemann@arm.com> Tested-by:
Tyler Baicar <tbaicar@codeaurora.org> Signed-off-by:
Jeffrey Hugo <jhugo@codeaurora.org> Acked-by:
Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Austin Christ <austinwc@codeaurora.org> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Timur Tabi <timur@codeaurora.org> Link: http://lkml.kernel.org/r/1496863138-11322-2-git-send-email-jhugo@codeaurora.orgSigned-off-by:
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Wanpeng Li authored
commit 2a42eb95 upstream. Currently the cputime source used by vtime is jiffies. When we cross a context boundary and jiffies have changed since the last snapshot, the pending cputime is accounted to the switching out context. This system works ok if the ticks are not aligned across CPUs. If they instead are aligned (ie: all fire at the same time) and the CPUs run in userspace, the jiffies change is only observed on tick exit and therefore the user cputime is accounted as system cputime. This is because the CPU that maintains timekeeping fires its tick at the same time as the others. It updates jiffies in the middle of the tick and the other CPUs see that update on IRQ exit: CPU 0 (timekeeper) CPU 1 ------------------- ------------- jiffies = N ... run in userspace for a jiffy tick entry tick entry (sees jiffies = N) set jiffies = N + 1 tick exit tick exit (sees jiffies = N + 1) account 1 jiffy as stime Fix this with using a nanosec clock source instead of jiffies. The cputime is then accumulated and flushed everytime the pending delta reaches a jiffy in order to mitigate the accounting overhead. [ fweisbec: changelog, rebase on struct vtime, field renames, add delta on cputime readers, keep idle vtime as-is (low overhead accounting), harmonize clock sources. ] Suggested-by:
Luiz Capitulino <lcapitulino@redhat.com> Tested-by:
Frederic Weisbecker <fweisbec@gmail.com> Reviewed-by:
Rik van Riel <riel@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Wanpeng Li <kernellwp@gmail.com> Link: http://lkml.kernel.org/r/1498756511-11714-6-git-send-email-fweisbec@gmail.comSigned-off-by:
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Frederic Weisbecker authored
commit bac5b6b6 upstream. We are about to add vtime accumulation fields to the task struct. Let's avoid more bloatification and gather vtime information to their own struct. Tested-by:
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Frederic Weisbecker authored
commit 60a9ce57 upstream. The current "snapshot" based naming on vtime fields suggests we record some past event but that's a low level picture of their actual purpose which comes out blurry. The real point of these fields is to run a basic state machine that tracks down cputime entry while switching between contexts. So lets reflect that with more meaningful names. Tested-by:
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Frederic Weisbecker authored
commit 9fa57cf5 upstream. Even though it doesn't have functional consequences, setting the task's new context state after we actually accounted the pending vtime from the old context state makes more sense from a review perspective. vtime_user_exit() is the only function that doesn't follow that rule and that can bug the reviewer for a little while until he realizes there is no reason for this special case. Tested-by:
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Frederic Weisbecker authored
commit 1c3eda01 upstream. It's an unnecessary function between vtime_user_exit() and account_user_time(). Tested-by:
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Jan Kara authored
commit 84969465 upstream. When new directory 'DIR1' is created in a directory 'DIR0' with SGID bit set, DIR1 is expected to have SGID bit set (and owning group equal to the owning group of 'DIR0'). However when 'DIR0' also has some default ACLs that 'DIR1' inherits, setting these ACLs will result in SGID bit on 'DIR1' to get cleared if user is not member of the owning group. Fix the problem by creating __hfsplus_set_posix_acl() function that does not call posix_acl_update_mode() and use it when inheriting ACLs. That prevents SGID bit clearing and the mode has been properly set by posix_acl_create() anyway. Fixes: 07393101Signed-off-by:
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Bart Van Assche authored
commit 99975cd4 upstream. ib_map_mr_sg() can pass an SG-list to .map_mr_sg() that is larger than what fits into a single MR. .map_mr_sg() must not attempt to map more SG-list elements than what fits into a single MR. Hence make sure that mlx5_ib_sg_to_klms() does not write outside the MR klms[] array. Fixes: b005d316 ("mlx5: Add arbitrary sg list support") Signed-off-by:
Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by:
Max Gurtovoy <maxg@mellanox.com> Cc: Sagi Grimberg <sagi@grimberg.me> Cc: Leon Romanovsky <leonro@mellanox.com> Cc: Israel Rukshin <israelr@mellanox.com> Acked-by:
Leon Romanovsky <leonro@mellanox.com> Reviewed-by:
Sagi Grimberg <sagi@grimberg.me> Signed-off-by:
Doug Ledford <dledford@redhat.com> Signed-off-by:
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Maarten Lankhorst authored
commit 50740024 upstream. Commit 9a148a96 ("drm/i915/debugfs: add dp mst info") adds support for DP-MST to intel_connector_info, but forgot to remove the early return for DP-MST. Remove it, and print out MST connectors directly. Fixes: 9a148a96 ("drm/i915/debugfs: add dp mst info") Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Cc: Libin Yang <libin.yang@intel.com> Signed-off-by:
Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> (cherry picked from commit 77d1f615) Signed-off-by:
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Imre Deak authored
commit 636c4c3e upstream. Currently we may process up/down message transactions containing uninitialized data. This can happen if there was an error during the reception of any message in the transaction, but we happened to receive the last message correctly with the end-of-message flag set. To avoid this abort the reception of the transaction when the first error is detected, rejecting any messages until a message with the start-of-message flag is received (which will start a new transaction). This is also what the DP 1.4 spec 2.11.8.2 calls for in this case. In addtion this also prevents receiving bogus transactions without the first message with the the start-of-message flag set. v2: - unchanged v3: - git add the part that actually skips messages after an error in drm_dp_sideband_msg_build() Cc: Dave Airlie <airlied@redhat.com> Cc: Lyude <lyude@redhat.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by:
Imre Deak <imre.deak@intel.com> Reviewed-by:
Lyude <lyude@redhat.com> Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20170719134632.13366-1-imre.deak@intel.comSigned-off-by:
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Imre Deak authored
commit 7f8b3987 upstream. In case of an unknown broadcast message is sent mstb will remain unset, so check for this. Cc: Dave Airlie <airlied@redhat.com> Cc: Lyude <lyude@redhat.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by:
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Imre Deak authored
commit 448421b5 upstream. Handle any error due to partial reads, timeouts etc. to avoid parsing uninitialized data subsequently. Also bail out if the parsing itself fails. Cc: Dave Airlie <airlied@redhat.com> Cc: Lyude <lyude@redhat.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by:
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Ismail, Mustafa authored
commit a62ab66b upstream. Initialize the port_num for iWARP in rdma_init_qp_attr. Fixes: 5ecce4c9("Check port number supplied by user verbs cmds") Reviewed-by:
Steve Wise <swise@opengridcomputing.com> Signed-off-by:
Mustafa Ismail <mustafa.ismail@intel.com> Tested-by:
Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by:
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Ismail, Mustafa authored
commit 5a7a88f1 upstream. The port number is only valid if IB_QP_PORT is set in the mask. So only check port number if it is valid to prevent modify_qp from failing due to an invalid port number. Fixes: 5ecce4c9("Check port number supplied by user verbs cmds") Reviewed-by:
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Yan, Zheng authored
commit 84583cfb upstream. For a large directory, program needs to issue multiple readdir syscalls to get all dentries. When there are multiple programs read the directory concurrently. Following sequence of events can happen. - program calls readdir with pos = 2. ceph sends readdir request to mds. The reply contains N1 entries. ceph adds these N1 entries to readdir cache. - program calls readdir with pos = N1+2. The readdir is satisfied by the readdir cache, N2 entries are returned. (Other program calls readdir in the middle, which fills the cache) - program calls readdir with pos = N1+N2+2. ceph sends readdir request to mds. The reply contains N3 entries and it reaches directory end. ceph adds these N3 entries to the readdir cache and marks directory complete. The second readdir call does not update fi->readdir_cache_idx. ceph add the last N3 entries to wrong places. Signed-off-by:
"Yan, Zheng" <zyan@redhat.com> Signed-off-by:
Ilya Dryomov <idryomov@gmail.com> Signed-off-by:
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Arnd Bergmann authored
commit 566e1ce2 upstream. We now get a helpful warning for code that calls copy_{from,to}_iter without checking the return value, introduced by commit aa28de27 ("iov_iter/hardening: move object size checks to inlined part"). drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c: In function 'kiblnd_send': drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c:1643:2: error: ignoring return value of 'copy_from_iter', declared with attribute warn_unused_result [-Werror=unused-result] drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c: In function 'kiblnd_recv': drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c:1744:3: error: ignoring return value of 'copy_to_iter', declared with attribute warn_unused_result [-Werror=unused-result] In case we get short copies here, we may get incorrect behavior. I've added failure handling for both rx and tx now, returning -EFAULT as expected. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
James Simmons <jsimmons@infradead.org> Signed-off-by:
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Teddy Wang authored
commit 740c433e upstream. If vesafb is enabled in the config then /dev/fb0 is created by vesa and this sm750 driver gets fb1, fb2. But we need to be fb0 and fb1 to effectively work with xorg. So if it has been alloted fb1, then try to remove the other fb0. In the previous send, why #ifdef is used was asked. https://lkml.org/lkml/2017/6/25/57 Answered at: https://lkml.org/lkml/2017/6/25/69 Also pasting here for reference. 'Did a quick research into "why". The patch d8801e4d ("x86/PCI: Set IORESOURCE_ROM_SHADOW only for the default VGA device") has started setting IORESOURCE_ROM_SHADOW in flags for a default VGA device and that is being done only for x86. And so, we will need that #ifdef to check IORESOURCE_ROM_SHADOW as that needs to be checked only for a x86 and not for other arch.' Signed-off-by:
Teddy Wang <teddy.wang@siliconmotion.com> Signed-off-by:
Sudip Mukherjee <sudipm.mukherjee@gmail.com> Signed-off-by:
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Ian Abbott authored
commit 15d51931 upstream. As reported by Éric Piel on the Comedi mailing list (see <https://groups.google.com/forum/#!topic/comedi_list/ueZiR7vTLOU/discussion>), the analog output asynchronous commands are running too fast with a period 50 ns shorter than it should be. This affects all boards with AO command support that are supported by the "ni_pcimio", "ni_atmio", and "ni_mio_cs" drivers. This is a regression bug introduced by commit 080e6795 ("staging: comedi: ni_mio_common: Cleans up/clarifies ni_ao_cmd"), specifically, this line in `ni_ao_cmd_set_update()`: /* following line: N-1 per STC */ ni_stc_writel(dev, trigvar - 1, NISTC_AO_UI_LOADA_REG); The `trigvar` variable value comes from a call to `ni_ns_to_timer()` which converts a timer period in nanoseconds to a hardware divisor value. The function already reduces the divisor by 1 as required by the hardware, so the above line should not reduce it further by 1. Fix it by replacing `trigvar` by `trigvar - 1` in the above line, and remove the misleading comment. Reported-by:
Éric Piel <piel@delmic.com> Fixes: 080e6795 ("staging: comedi: ni_mio_common: Cleans up/clarifies ni_ao_cmd") Cc: Éric Piel <piel@delmic.com> Cc: Spencer E. Olson <olsonse@umich.edu> Signed-off-by:
Ian Abbott <abbotti@mev.co.uk> Signed-off-by:
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Michael Gugino authored
commit 5a1d4c5d upstream. Add support for USB Device TP-Link TL-WN722N v2. VendorID: 0x2357, ProductID: 0x010c Signed-off-by:
Michael Gugino <michael.gugino.2@gmail.com> Signed-off-by:
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Ingo Molnar authored
commit 6a8a75f3 upstream. This reverts commit cc1582c2. This commit introduced a regression that broke rr-project, which uses sampling events to receive a signal on overflow (but does not care about the contents of the sample). These signals are critical to the correct operation of rr. There's been some back and forth about how to fix it - but to not keep applications in limbo queue up a revert. Reported-by:
Kyle Huey <me@kylehuey.com> Acked-by:
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Alexander Shishkin authored
commit 3bda69c1 upstream. Vince Weaver reported: > I was tracking down some regressions in my perf_event_test testsuite. > Some of the tests broke in the 4.11-rc1 timeframe. > > I've bisected one of them, this report is about > tests/overflow/simul_oneshot_group_overflow > This test creates an event group containing two sampling events, set > to overflow to a signal handler (which disables and then refreshes the > event). > > On a good kernel you get the following: > Event perf::instructions with period 1000000 > Event perf::instructions with period 2000000 > fd 3 overflows: 946 (perf::instructions/1000000) > fd 4 overflows: 473 (perf::instructions/2000000) > Ending counts: > Count 0: 946379875 > Count 1: 946365218 > > With the broken kernels you get: > Event perf::instructions with period 1000000 > Event perf::instructions with period 2000000 > fd 3 overflows: 938 (perf::instructions/1000000) > fd 4 overflows: 318 (perf::instructions/2000000) > Ending counts: > Count 0: 946373080 > Count 1: 653373058 The root cause of the bug is that the following commit: 487f05e1 ("perf/core: Optimize event rescheduling on active contexts") erronously assumed that event's 'pinned' setting determines whether the event belongs to a pinned group or not, but in fact, it's the group leader's pinned state that matters. This was discovered by Vince in the test case described above, where two instruction counters are grouped, the group leader is pinned, but the other event is not; in the regressed case the counters were off by 33% (the difference between events' periods), but should be the same within the error margin. Fix the problem by looking at the group leader's pinning. Reported-by:
Vince Weaver <vincent.weaver@maine.edu> Tested-by:
Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 487f05e1 ("perf/core: Optimize event rescheduling on active contexts") Link: http://lkml.kernel.org/r/87lgnmvw7h.fsf@ashishki-desk.ger.corp.intel.comSigned-off-by:
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