- 04 Dec, 2017 1 commit
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Tom Herbert authored
The start callback allows the caller to set up a context for the dump callbacks. Presumably, the context can then be destroyed in the done callback. Signed-off-by:
Tom Herbert <tom@herbertland.com> Signed-off-by:
David S. Miller <davem@davemloft.net> CVE-2017-16939 (cherry picked from commit fc9e50f5) Signed-off-by:
Kleber Sacilotto de Souza <kleber.souza@canonical.com> Acked-by:
Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Acked-by:
Stefan Bader <stefan.bader@canonical.com> Signed-off-by:
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- 01 Dec, 2017 1 commit
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Thadeu Lima de Souza Cascardo authored
Ignore: yes Signed-off-by:
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- 21 Nov, 2017 1 commit
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Stefan Bader authored
Signed-off-by:
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- 20 Nov, 2017 13 commits
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Amir Goldstein authored
BugLink: http://bugs.launchpad.net/bugs/1728489 stat(2) on overlay directories reports the overlay temp inode number, which is constant across copy up, but is not persistent. When all layers are on the same fs, report the copy up origin inode number for directories. This inode number is persistent, unique across the overlay mount and constant across copy up. Signed-off-by:
Amir Goldstein <amir73il@gmail.com> Signed-off-by:
Miklos Szeredi <mszeredi@redhat.com> (backported from commit b7a807dc) Signed-off-by:
Daniel Axtens <daniel.axtens@canonical.com> Acked-by:
Colin King <colin.king@canonical.com> Signed-off-by:
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Amir Goldstein authored
BugLink: http://bugs.launchpad.net/bugs/1728489 Some features can only work when all layers are on the same fs. Test this condition during mount time, so features can check them later. Add helper ovl_same_sb() to return the common super block in case all layers are on the same fs. Signed-off-by:
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Marc Olson authored
BugLink: https://bugs.launchpad.net/bugs/1729119 The underlying blk_mq_tag_set, and request timeout parameters support an unsigned int. Extend the size of the nvme module parameters for io and admin commands to match. Signed-off-by:
Marc Olson <marcolso@amazon.com> Signed-off-by:
Christoph Hellwig <hch@lst.de> (backported from commit 8ae4e447) Signed-off-by:
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Thadeu Lima de Souza Cascardo authored
BugLink: https://bugs.launchpad.net/bugs/1730660 When stopping CPUS fail when doing kdump, the system will hang indefinitively, instead of rebooting. Using the default value of 10 for PANIC_TIMEOUT that we had for trusty allows the system to reboot. Signed-off-by:
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Konrad Zapałowicz authored
This patch increases the connection timeout for LE connections that are triggered by the advertising report to 4 seconds. It has been observed that devices equipped with wifi+bt combo SoC fail to create a connection with BLE devices due to their coexistence issues. Increasing this timeout gives them enough time to complete the connection with success. Signed-off-by:
Konrad Zapałowicz <konrad.zapalowicz@canonical.com> Signed-off-by:
Marcel Holtmann <marcel@holtmann.org> BugLink: https://bugs.launchpad.net/bugs/1731467 (cherry-picked from commit 1f01d8be) Signed-off-by:
Seth Forshee <seth.forshee@canonical.com> Acked-by:
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Steve French authored
BugLink: http://bugs.launchpad.net/bugs/1729337 According to MS-SMB2 3.2.55 validate_negotiate request must always be signed. Some Windows can fail the request if you send it unsigned See kernel bugzilla bug 197311 CC: Stable <stable@vger.kernel.org> Acked-by: Ronnie Sahlberg <lsahlber.redhat.com> Signed-off-by:
Steve French <smfrench@gmail.com> (cherry picked from commit 4587eee0) Signed-off-by:
Joseph Salisbury <joseph.salisbury@canonical.com> Acked-by:
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Kai-Heng Feng authored
Like other Plantronics devices, P610 does not support sample rate reading. Apply sample rate quirk to it. BugLink: https://bugs.launchpad.net/bugs/1719853Signed-off-by:
Kai-Heng Feng <kai.heng.feng@canonical.com> Signed-off-by:
Takashi Iwai <tiwai@suse.de> (cherry picked from commit c247487c) Signed-off-by:
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Brian Foster authored
BugLink: http://bugs.launchpad.net/bugs/1729256 xfs_attr3_root_inactive() walks the attr fork tree to invalidate the associated blocks. xfs_attr3_node_inactive() recursively descends from internal blocks to leaf blocks, caching block address values along the way to revisit parent blocks, locate the next entry and descend down that branch of the tree. The code that attempts to reread the parent block is unsafe because it assumes that the local xfs_da_node_entry pointer remains valid after an xfs_trans_brelse() and re-read of the parent buffer. Under heavy memory pressure, it is possible that the buffer has been reclaimed and reallocated by the time the parent block is reread. This means that 'btree' can point to an invalid memory address, lead to a random/garbage value for child_fsb and cause the subsequent read of the attr fork to go off the rails and return a NULL buffer for an attr fork offset that is most likely not allocated. Note that this problem can be manufactured by setting XFS_ATTR_BTREE_REF to 0 to prevent LRU caching of attr buffers, creating a file with a multi-level attr fork and removing it to trigger inactivation. To address this problem, reinit the node/btree pointers to the parent buffer after it has been re-read. This ensures btree points to a valid record and allows the walk to proceed. Signed-off-by:
Brian Foster <bfoster@redhat.com> Reviewed-by:
Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by:
Gavin Guo <gavin.guo@canonical.com> Acked-by:
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Eric Dumazet authored
BugLink: http://bugs.launchpad.net/bugs/1729637 Based on a syzkaller report [1], I found that a per cpu allocation failure in snmp6_alloc_dev() would then lead to NULL dereference in ip6_route_dev_notify(). It seems this is a very old bug, thus no Fixes tag in this submission. Let's add in6_dev_put_clear() helper, as we will probably use it elsewhere (once available/present in net-next) [1] kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 17294 Comm: syz-executor6 Not tainted 4.13.0-rc2+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88019f456680 task.stack: ffff8801c6e58000 RIP: 0010:__read_once_size include/linux/compiler.h:250 [inline] RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:26 [inline] RIP: 0010:refcount_sub_and_test+0x7d/0x1b0 lib/refcount.c:178 RSP: 0018:ffff8801c6e5f1b0 EFLAGS: 00010202 RAX: 0000000000000037 RBX: dffffc0000000000 RCX: ffffc90005d25000 RDX: ffff8801c6e5f218 RSI: ffffffff82342bbf RDI: 0000000000000001 RBP: ffff8801c6e5f240 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10038dcbe37 R13: 0000000000000006 R14: 0000000000000001 R15: 00000000000001b8 FS: 00007f21e0429700(0000) GS:ffff8801dc100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001ddbc22000 CR3: 00000001d632b000 CR4: 00000000001426e0 DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: refcount_dec_and_test+0x1a/0x20 lib/refcount.c:211 in6_dev_put include/net/addrconf.h:335 [inline] ip6_route_dev_notify+0x1c9/0x4a0 net/ipv6/route.c:3732 notifier_call_chain+0x136/0x2c0 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x51/0x90 net/core/dev.c:1678 call_netdevice_notifiers net/core/dev.c:1694 [inline] rollback_registered_many+0x91c/0xe80 net/core/dev.c:7107 rollback_registered+0x1be/0x3c0 net/core/dev.c:7149 register_netdevice+0xbcd/0xee0 net/core/dev.c:7587 register_netdev+0x1a/0x30 net/core/dev.c:7669 loopback_net_init+0x76/0x160 drivers/net/loopback.c:214 ops_init+0x10a/0x570 net/core/net_namespace.c:118 setup_net+0x313/0x710 net/core/net_namespace.c:294 copy_net_ns+0x27c/0x580 net/core/net_namespace.c:418 create_new_namespaces+0x425/0x880 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xae/0x1e0 kernel/nsproxy.c:206 SYSC_unshare kernel/fork.c:2347 [inline] SyS_unshare+0x653/0xfa0 kernel/fork.c:2297 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x4512c9 RSP: 002b:00007f21e0428c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 0000000000718150 RCX: 00000000004512c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000062020200 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b973d R13: 00000000ffffffff R14: 000000002001d000 R15: 00000000000002dd Code: 50 2b 34 82 c7 00 f1 f1 f1 f1 c7 40 04 04 f2 f2 f2 c7 40 08 f3 f3 f3 f3 e8 a1 43 39 ff 4c 89 f8 48 8b 95 70 ff ff ff 48 c1 e8 03 <0f> b6 0c 18 4c 89 f8 83 e0 07 83 c0 03 38 c8 7c 08 84 c9 0f 85 RIP: __read_once_size include/linux/compiler.h:250 [inline] RSP: ffff8801c6e5f1b0 RIP: atomic_read arch/x86/include/asm/atomic.h:26 [inline] RSP: ffff8801c6e5f1b0 RIP: refcount_sub_and_test+0x7d/0x1b0 lib/refcount.c:178 RSP: ffff8801c6e5f1b0 ---[ end trace e441d046c6410d31 ]--- Signed-off-by:
Eric Dumazet <edumazet@google.com> Reported-by:
Dmitry Vyukov <dvyukov@google.com> Signed-off-by:
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WANG Cong authored
BugLink: http://bugs.launchpad.net/bugs/1729637 In commit 242d3a49 ("ipv6: reorder ip6_route_dev_notifier after ipv6_dev_notf") I assumed NETDEV_REGISTER and NETDEV_UNREGISTER are paired, unfortunately, as reported by jeffy, netdev_wait_allrefs() could rebroadcast NETDEV_UNREGISTER event until all refs are gone. We have to add an additional check to avoid this corner case. For netdev_wait_allrefs() dev->reg_state is NETREG_UNREGISTERED, for dev_change_net_namespace(), dev->reg_state is NETREG_REGISTERED. So check for dev->reg_state != NETREG_UNREGISTERED. Fixes: 242d3a49 ("ipv6: reorder ip6_route_dev_notifier after ipv6_dev_notf") Reported-by:
jeffy <jeffy.chen@rock-chips.com> Cc: David Ahern <dsahern@gmail.com> Signed-off-by:
Cong Wang <xiyou.wangcong@gmail.com> Acked-by:
David Ahern <dsahern@gmail.com> Signed-off-by:
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Sam Mendoza-Jonas authored
BugLink: http://bugs.launchpad.net/bugs/1728098 Update the hvc driver to use the OPAL irqchip if made available by the running firmware. If it is not present, the driver falls back to the existing OPAL event number. Signed-off-by:
Samuel Mendoza-Jonas <sam@mendozajonas.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> (cherry picked from commit 00dab818) Signed-off-by:
Kamal Mostafa <kamal@canonical.com> Signed-off-by:
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Hannes Reinecke authored
BugLink: http://bugs.launchpad.net/bugs/1730852 VMWare ESXi emulates an mptsas HBA, but exposes all drives as direct-attached SAS drives. This it not how the driver originally envisioned things; SAS drives were supposed to be connected via an expander, and only SATA drives would be direct attached. As such, any hotplug event for direct-attach SAS drives was silently ignored, and the guest failed to detect new drives from within a VMWare ESXi environment. [mkp: typos] Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=1030850Signed-off-by:
Hannes Reinecke <hare@suse.com> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com> (cherry picked from commit ee3e2d83) Signed-off-by:
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Paul Mackerras authored
BugLink: http://bugs.launchpad.net/bugs/1727331 POWER8 has one virtual timebase (VTB) register per subcore, not one per CPU thread. The HV KVM code currently treats VTB as a per-thread register, which can lead to spurious soft lockup messages from guests which use the VTB as the time source for the soft lockup detector. (CPUs before POWER8 did not have the VTB register.) For HV KVM, this fixes the problem by making only the primary thread in each virtual core save and restore the VTB value. With this, the VTB state becomes part of the kvmppc_vcore structure. This also means that "piggybacking" of multiple virtual cores onto one subcore is not possible on POWER8, because then the virtual cores would share a single VTB register. PR KVM emulates a VTB register, which is per-vcpu because PR KVM has no notion of CPU threads or SMT. For PR KVM we move the VTB state into the kvmppc_vcpu_book3s struct. Cc: stable@vger.kernel.org # v3.14+ Reported-by:
Thomas Huth <thuth@redhat.com> Tested-by:
Paul Mackerras <paulus@ozlabs.org> Signed-off-by:
Andy Whitcroft <andy.whitcroft@canonical.com> Acked-by:
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- 16 Nov, 2017 24 commits
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Ilya Dryomov authored
BugLink: https://bugs.launchpad.net/bugs/1728739 Empty request_redirect_t (struct ceph_request_redirect in the kernel client) is now encoded with a bool. NEW_OSDOPREPLY_ENCODING feature bit overlaps with already supported CRUSH_TUNABLES5. Signed-off-by:
Ilya Dryomov <idryomov@gmail.com> Reviewed-by:
Sage Weil <sage@redhat.com> (cherry picked from commit b0b31a8f) Signed-off-by:
Billy Olsen <billy.olsen@canonical.com> Acked-by:
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Ilya Dryomov authored
BugLink: https://bugs.launchpad.net/bugs/1728739 Add TUNABLES5 feature (chooseleaf_stable tunable) to a set of features supported by default. Signed-off-by:
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Ilya Dryomov authored
BugLink: https://bugs.launchpad.net/bugs/1728739 Also add missing \n while at it. Signed-off-by:
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Ilya Dryomov authored
BugLink: https://bugs.launchpad.net/bugs/1728739 Add a tunable to fix the bug that chooseleaf may cause unnecessary pg migrations when some device fails. Reflects ceph.git commit fdb3f664448e80d984470f32f04e2e6f03ab52ec. Signed-off-by:
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Ilya Dryomov authored
BugLink: https://bugs.launchpad.net/bugs/1728739 Ensure that the take argument is a valid bucket ID before indexing the buckets array. Reflects ceph.git commit 93ec538e8a667699876b72459b8ad78966d89c61. Signed-off-by:
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Ilya Dryomov authored
BugLink: https://bugs.launchpad.net/bugs/1728739 We were indexing the buckets array without verifying the index was within the [0,max_buckets) range. This could happen because a multistep rule does not have enough buckets and has CRUSH_ITEM_NONE for an intermediate result, which would feed in CRUSH_ITEM_NONE and make us crash. Reflects ceph.git commit 976a24a326da8931e689ee22fce35feab5b67b76. Signed-off-by:
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Greg Kroah-Hartman authored
BugLink: http://bugs.launchpad.net/bugs/1732698Signed-off-by:
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Colin Ian King authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit 06aae592 upstream. The boolean want is not initialized and hence garbage. The default should be false (later it is only set to true on tne sinfo->authattrs check). Found with static analysis using CoverityScan Signed-off-by:
David Howells <dhowells@redhat.com> Cc: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
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Borislav Petkov authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit a743bbee upstream. The warning below says it all: BUG: using __this_cpu_read() in preemptible [00000000] code: swapper/0/1 caller is __this_cpu_preempt_check CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.0-rc8 #4 Call Trace: dump_stack check_preemption_disabled ? do_early_param __this_cpu_preempt_check arch_perfmon_init op_nmi_init ? alloc_pci_root_info oprofile_arch_init oprofile_init do_one_initcall ... These accessors should not have been used in the first place: it is PPro so no mixed silicon revisions and thus it can simply use boot_cpu_data. Reported-by:
Fengguang Wu <fengguang.wu@intel.com> Tested-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
Borislav Petkov <bp@suse.de> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Cc: Robert Richter <rric@kernel.org> Cc: x86@kernel.org Signed-off-by:
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Richard Schütz authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit fb5f0b3e upstream. The D_CAN controller doesn't provide a triple sampling mode, so don't set the CAN_CTRLMODE_3_SAMPLES flag in ctrlmode_supported. Currently enabling triple sampling is a no-op. Signed-off-by:
Richard Schütz <rschuetz@uni-koblenz.de> Signed-off-by:
Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by:
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Gerhard Bertelsmann authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit 4dcf924c upstream. SUN4Is CAN IP has a 64 byte deep FIFO buffer. If the buffer is not drained fast enough (overrun) it's getting mangled. Already received frames are dropped - the data can't be restored. Signed-off-by:
Gerhard Bertelsmann <info@gerhard-bertelsmann.de> Signed-off-by:
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Ilya Dryomov authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit 1e37f2f8 upstream. rbd_img_obj_exists_submit() and rbd_img_obj_parent_read_full() are on the writeback path for cloned images -- we attempt a stat on the parent object to see if it exists and potentially read it in to call copyup. GFP_NOIO should be used instead of GFP_KERNEL here. Link: http://tracker.ceph.com/issues/22014Signed-off-by:
David Disseldorp <ddiss@suse.de> [idryomov@gmail.com: backport to < 4.9: context] Signed-off-by:
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Sinclair Yeh authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit cef75036 upstream. This is an extension of Commit 7c20d213 ("drm/vmwgfx: Work around mode set failure in 2D VMs") With Wayland desktop and atomic mode set, during the mode setting process there is a moment when two framebuffer sized surfaces are being pinned. This was not an issue with Xorg. Since this only happens during a mode change, there should be no performance impact by increasing allowable mem_size. Signed-off-by:
Sinclair Yeh <syeh@vmware.com> Reviewed-by:
Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by:
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Kai-Heng Feng authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit cdea6a30 upstream. ELAN060C touchpad uses elan_i2c as its driver. It can be found on Lenovo ideapad 320-14AST. BugLink: https://bugs.launchpad.net/bugs/1727544Signed-off-by:
Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by:
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Oswald Buddenhagen authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit b084116f upstream. Without UPF_FIXED_TYPE, the data from the PORT_AR7 uart_config entry is never copied, resulting in a dead port. Fixes: 154615d5 ("MIPS: AR7: Use correct UART port type") Signed-off-by:
Oswald Buddenhagen <oswald.buddenhagen@gmx.de> [jonas.gorski: add Fixes tag] Signed-off-by:
Jonas Gorski <jonas.gorski@gmail.com> Reviewed-by:
Florian Fainelli <f.fainelli@gmail.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com> Cc: Nicolas Schichan <nschichan@freebox.fr> Cc: Oswald Buddenhagen <oswald.buddenhagen@gmx.de> Cc: linux-mips@linux-mips.org Cc: linux-serial@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/17543/Signed-off-by:
James Hogan <jhogan@kernel.org> Signed-off-by:
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Jonas Gorski authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit e6b03ab6 upstream. When called from prom init code, ar7_gpio_init() will fail as it will call gpiochip_add() which relies on a working kmalloc() to alloc the gpio_desc array and kmalloc is not useable yet at prom init time. Move ar7_gpio_init() to ar7_register_devices() (a device_initcall) where kmalloc works. Fixes: 14e85c0e ("gpio: remove gpio_descs global array") Signed-off-by:
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Luis R. Rodriguez authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit afb999cd upstream. Some distributions (Debian, OpenSUSE) have a udev rule in place to cancel all fallback mechanism uevents immediately. This would obviously make it hard to test against the fallback mechanism test interface, so we need to check for this. Signed-off-by:
Luis R. Rodriguez <mcgrof@kernel.org> Signed-off-by:
Amit Pundir <amit.pundir@linaro.org> Signed-off-by:
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Luis R. Rodriguez authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit 880444e2 upstream. Error that we expect should not be spilled to stdout. Without this we get: ./fw_filesystem.sh: line 58: printf: write error: Invalid argument ./fw_filesystem.sh: line 63: printf: write error: No such device ./fw_filesystem.sh: line 69: echo: write error: No such file or directory ./fw_filesystem.sh: filesystem loading works ./fw_filesystem.sh: async filesystem loading works With it: ./fw_filesystem.sh: filesystem loading works ./fw_filesystem.sh: async filesystem loading works Signed-off-by:
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Brian Norris authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit 1b1fe542 upstream. Now that we've added a 'trigger_async_request' knob to test the request_firmware_nowait() API, let's use it. Also add tests for the empty ("") string, since there have been a couple errors in that handling already. Since we now have real ways that the sysfs write might fail, let's add the appropriate check on the 'echo' lines too. Signed-off-by:
Brian Norris <computersforpeace@gmail.com> Acked-by:
Kees Cook <keescook@chromium.org> Signed-off-by:
Shuah Khan <shuahkh@osg.samsung.com> [AmitP: Dropped the async trigger testing parts from original commit] Signed-off-by:
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Brian Norris authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit 47e0bbb7 upstream. request_firmware() failures currently won't get reported at all (the error code is discarded). What's more, we get confusing messages, like: # echo -n notafile > /sys/devices/virtual/misc/test_firmware/trigger_request [ 8280.311856] test_firmware: loading 'notafile' [ 8280.317042] test_firmware: load of 'notafile' failed: -2 [ 8280.322445] test_firmware: loaded: 0 # echo $? 0 Report the failures via write() errors, and don't say we "loaded" anything. Signed-off-by:
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Matt Redfearn authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit 9e8c399a upstream. Commit 6f542ebe ("MIPS: Fix race on setting and getting cpu_online_mask") effectively reverted commit 8f46cca1 ("MIPS: SMP: Fix possibility of deadlock when bringing CPUs online") and thus has reinstated the possibility of deadlock. The commit was based on testing of kernel v4.4, where the CPU hotplug core code issued a BUG() if the starting CPU is not marked online when the boot CPU returns from __cpu_up. The commit fixes this race (in v4.4), but re-introduces the deadlock situation. As noted in the commit message, upstream differs in this area. Commit 8df3e07e ("cpu/hotplug: Let upcoming cpu bring itself fully up") adds a completion event in the CPU hotplug core code, making this race impossible. However, people were unhappy with relying on the core code to do the right thing. To address the issues both commits were trying to fix, add a second completion event in the MIPS smp hotplug path. It removes the possibility of a race, since the MIPS smp hotplug code now synchronises both the boot and secondary CPUs before they return to the hotplug core code. It also addresses the deadlock by ensuring that the secondary CPU is not marked online before it's counters are synchronised. This fix should also be backported to fix the race condition introduced by the backport of commit 8f46cca1 ("MIPS: SMP: Fix possibility of deadlock when bringing CPUs online"), through really that race only existed before commit 8df3e07e ("cpu/hotplug: Let upcoming cpu bring itself fully up"). Signed-off-by:
Matt Redfearn <matt.redfearn@imgtec.com> Fixes: 6f542ebe ("MIPS: Fix race on setting and getting cpu_online_mask") CC: Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@nokia.com> Patchwork: https://patchwork.linux-mips.org/patch/17376/Signed-off-by:
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Matija Glavinic Pecotic authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit 6f542ebe upstream. While testing cpu hoptlug (cpu down and up in loops) on kernel 4.4, it was observed that occasionally check for cpu online will fail in kernel/cpu.c, _cpu_up: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/tree/kernel/cpu.c?h=v4.4.79#n485 518 /* Arch-specific enabling code. */ 519 ret = __cpu_up(cpu, idle); 520 521 if (ret != 0) 522 goto out_notify; 523 BUG_ON(!cpu_online(cpu)); Reason is race between start_secondary and _cpu_up. cpu_callin_map is set before cpu_online_mask. In __cpu_up, cpu_callin_map is waited for, but cpu online mask is not, resulting in race in which secondary processor started and set cpu_callin_map, but not yet set the online mask,resulting in above BUG being hit. Upstream differs in the area. cpu_online check is in bringup_wait_for_ap, which is after cpu reached AP_ONLINE_IDLE,where secondary passed its start function. Nonetheless, fix makes start_secondary safe and not depending on other locks throughout the code. It protects as well against cpu_online checks put in between sometimes in the future. Fix this by moving completion after all flags are set. Signed-off-by:
Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@nokia.com> Cc: Alexander Sverdlin <alexander.sverdlin@nokia.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/16925/Signed-off-by:
Ralf Baechle <ralf@linux-mips.org> Signed-off-by:
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Matt Redfearn authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit a00eeede upstream. If a secondary CPU failed to start, for any reason, the CPU requesting the secondary to start would get stuck in the loop waiting for the secondary to be present in the cpu_callin_map. Rather than that, use a completion event to signal that the secondary CPU has started and is waiting to synchronise counters. Since the CPU presence will no longer be marked in cpu_callin_map, remove the redundant test from arch_cpu_idle_dead(). Signed-off-by:
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Paul Burton authored
BugLink: http://bugs.launchpad.net/bugs/1732698 commit 6a6cba1d upstream. The default CM target field in the GCR_BASE register is encoded with 0 meaning memory & 1 being reserved. However the definitions we use for those bits effectively get these two values backwards - likely because they were copied from the definitions for the CM regions where the target is encoded differently. This results in use setting up GCR_BASE with the reserved target value by default, rather than targeting memory as intended. Although we currently seem to get away with this it's not a great idea to rely upon. Fix this by changing our macros to match the documentated target values. The incorrect encoding became used as of commit 9f98f3dd ("MIPS: Add generic CM probe & access code") in the Linux v3.15 cycle, and was likely carried forwards from older but unused code introduced by commit 39b8d525 ("[MIPS] Add support for MIPS CMP platform.") in the v2.6.26 cycle. Fixes: 9f98f3dd ("MIPS: Add generic CM probe & access code") Signed-off-by:
Paul Burton <paul.burton@mips.com> Reported-by:
Matt Redfearn <matt.redfearn@mips.com> Reviewed-by:
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