1. 07 Nov, 2019 17 commits
  2. 06 Nov, 2019 19 commits
  3. 05 Nov, 2019 4 commits
    • Ivan Khoronzhuk's avatar
      taprio: fix panic while hw offload sched list swap · 0763b3e8
      Ivan Khoronzhuk authored
      Don't swap oper and admin schedules too early, it's not correct and
      causes crash.
      
      Steps to reproduce:
      
      1)
      tc qdisc replace dev eth0 parent root handle 100 taprio \
          num_tc 3 \
          map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 \
          queues 1@0 1@1 1@2 \
          base-time $SOME_BASE_TIME \
          sched-entry S 01 80000 \
          sched-entry S 02 15000 \
          sched-entry S 04 40000 \
          flags 2
      
      2)
      tc qdisc replace dev eth0 parent root handle 100 taprio \
          base-time $SOME_BASE_TIME \
          sched-entry S 01 90000 \
          sched-entry S 02 20000 \
          sched-entry S 04 40000 \
          flags 2
      
      3)
      tc qdisc replace dev eth0 parent root handle 100 taprio \
          base-time $SOME_BASE_TIME \
          sched-entry S 01 150000 \
          sched-entry S 02 200000 \
          sched-entry S 04 40000 \
          flags 2
      
      Do 2 3 2 .. steps  more times if not happens and observe:
      
      [  305.832319] Unable to handle kernel write to read-only memory at
      virtual address ffff0000087ce7f0
      [  305.910887] CPU: 0 PID: 0 Comm: swapper/0 Not tainted
      [  305.919306] Hardware name: Texas Instruments AM654 Base Board (DT)
      
      [...]
      
      [  306.017119] x1 : ffff800848031d88 x0 : ffff800848031d80
      [  306.022422] Call trace:
      [  306.024866]  taprio_free_sched_cb+0x4c/0x98
      [  306.029040]  rcu_process_callbacks+0x25c/0x410
      [  306.033476]  __do_softirq+0x10c/0x208
      [  306.037132]  irq_exit+0xb8/0xc8
      [  306.040267]  __handle_domain_irq+0x64/0xb8
      [  306.044352]  gic_handle_irq+0x7c/0x178
      [  306.048092]  el1_irq+0xb0/0x128
      [  306.051227]  arch_cpu_idle+0x10/0x18
      [  306.054795]  do_idle+0x120/0x138
      [  306.058015]  cpu_startup_entry+0x20/0x28
      [  306.061931]  rest_init+0xcc/0xd8
      [  306.065154]  start_kernel+0x3bc/0x3e4
      [  306.068810] Code: f2fbd5b7 f2fbd5b6 d503201f f9400422 (f9000662)
      [  306.074900] ---[ end trace 96c8e2284a9d9d6e ]---
      [  306.079507] Kernel panic - not syncing: Fatal exception in interrupt
      [  306.085847] SMP: stopping secondary CPUs
      [  306.089765] Kernel Offset: disabled
      
      Try to explain one of the possible crash cases:
      
      The "real" admin list is assigned when admin_sched is set to
      new_admin, it happens after "swap", that assigns to oper_sched NULL.
      Thus if call qdisc show it can crash.
      
      Farther, next second time, when sched list is updated, the admin_sched
      is not NULL and becomes the oper_sched, previous oper_sched was NULL so
      just skipped. But then admin_sched is assigned new_admin, but schedules
      to free previous assigned admin_sched (that already became oper_sched).
      
      Farther, next third time, when sched list is updated,
      while one more swap, oper_sched is not null, but it was happy to be
      freed already (while prev. admin update), so while try to free
      oper_sched the kernel panic happens at taprio_free_sched_cb().
      
      So, move the "swap emulation" where it should be according to function
      comment from code.
      
      Fixes: 9c66d156 ("taprio: Add support for hardware offloading")
      Signed-off-by: default avatarIvan Khoronzhuk <ivan.khoronzhuk@linaro.org>
      Acked-by: default avatarVinicius Costa Gomes <vinicius.gomes@intel.com>
      Tested-by: default avatarVladimir Oltean <olteanv@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0763b3e8
    • David S. Miller's avatar
      Merge tag 'linux-can-fixes-for-5.4-20191105' of... · fc564e09
      David S. Miller authored
      Merge tag 'linux-can-fixes-for-5.4-20191105' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can
      
      Marc Kleine-Budde says:
      
      ====================
      pull-request: can 2019-11-05
      
      this is a pull request of 33 patches for net/master.
      
      In the first patch Wen Yang's patch adds a missing of_node_put() to CAN device
      infrastructure.
      
      Navid Emamdoost's patch for the gs_usb driver fixes a memory leak in the
      gs_can_open() error path.
      
      Johan Hovold provides two patches, one for the mcba_usb, the other for the
      usb_8dev driver. Both fix a use-after-free after USB-disconnect.
      
      Joakim Zhang's patch improves the flexcan driver, the ECC mechanism is now
      completely disabled instead of masking the interrupts.
      
      The next three patches all target the peak_usb driver. Stephane Grosjean's
      patch fixes a potential out-of-sync while decoding packets, Johan Hovold's
      patch fixes a slab info leak, Jeroen Hofstee's patch adds missing reporting of
      bus off recovery events.
      
      Followed by three patches for the c_can driver. Kurt Van Dijck's patch fixes
      detection of potential missing status IRQs, Jeroen Hofstee's patches add a chip
      reset on open and add missing reporting of bus off recovery events.
      
      Appana Durga Kedareswara rao's patch for the xilinx driver fixes the flags
      field initialization for axi CAN.
      
      The next seven patches target the rx-offload helper, they are by me and Jeroen
      Hofstee. The error handling in case of a queue overflow is fixed removing a
      memory leak. Further the error handling in case of queue overflow and skb OOM
      is cleaned up.
      
      The next two patches are by me and target the flexcan and ti_hecc driver. In
      case of a error during can_rx_offload_queue_sorted() the error counters in the
      drivers are incremented.
      
      Jeroen Hofstee provides 6 patches for the ti_hecc driver, which properly stop
      the device in ifdown, improve the rx-offload support (which hit mainline in
      v5.4-rc1), and add missing FIFO overflow and state change reporting.
      
      The following four patches target the j1939 protocol. Colin Ian King's patch
      fixes a memory leak in the j1939_sk_errqueue() handling. Three patches by
      Oleksij Rempel fix a memory leak on socket release and fix the EOMA packet in
      the transport protocol.
      
      Timo Schlüßler's patch fixes a potential race condition in the mcp251x driver
      on after suspend.
      
      The last patch is by Yegor Yefremov and updates the SPDX-License-Identifier to
      v3.0.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      fc564e09
    • Yegor Yefremov's avatar
      can: don't use deprecated license identifiers · 3926a3a0
      Yegor Yefremov authored
      The "GPL-2.0" license identifier changed to "GPL-2.0-only" in SPDX v3.0.
      Signed-off-by: default avatarYegor Yefremov <yegorslists@googlemail.com>
      Acked-by: default avatarOliver Hartkopp <socketcan@hartkopp.net>
      Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
      3926a3a0
    • Timo Schlüßler's avatar
      can: mcp251x: mcp251x_restart_work_handler(): Fix potential force_quit race condition · 27a0e54b
      Timo Schlüßler authored
      In mcp251x_restart_work_handler() the variable to stop the interrupt
      handler (priv->force_quit) is reset after the chip is restarted and thus
      a interrupt might occur.
      
      This patch fixes the potential race condition by resetting force_quit
      before enabling interrupts.
      Signed-off-by: default avatarTimo Schlüßler <schluessler@krause.de>
      Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
      27a0e54b