• Nicolin Chen's avatar
    net: stmmac: Delete txtimer in suspend() · 14b41a29
    Nicolin Chen authored
    When running v5.5 with a rootfs on NFS, memory abort may happen in
    the system resume stage:
     Unable to handle kernel paging request at virtual address dead00000000012a
     [dead00000000012a] address between user and kernel address ranges
     pc : run_timer_softirq+0x334/0x3d8
     lr : run_timer_softirq+0x244/0x3d8
     x1 : ffff800011cafe80 x0 : dead000000000122
     Call trace:
      run_timer_softirq+0x334/0x3d8
      efi_header_end+0x114/0x234
      irq_exit+0xd0/0xd8
      __handle_domain_irq+0x60/0xb0
      gic_handle_irq+0x58/0xa8
      el1_irq+0xb8/0x180
      arch_cpu_idle+0x10/0x18
      do_idle+0x1d8/0x2b0
      cpu_startup_entry+0x24/0x40
      secondary_start_kernel+0x1b4/0x208
     Code: f9000693 a9400660 f9000020 b4000040 (f9000401)
     ---[ end trace bb83ceeb4c482071 ]---
     Kernel panic - not syncing: Fatal exception in interrupt
     SMP: stopping secondary CPUs
     SMP: failed to stop secondary CPUs 2-3
     Kernel Offset: disabled
     CPU features: 0x00002,2300aa30
     Memory Limit: none
     ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---
    
    It's found that stmmac_xmit() and stmmac_resume() sometimes might
    run concurrently, possibly resulting in a race condition between
    mod_timer() and setup_timer(), being called by stmmac_xmit() and
    stmmac_resume() respectively.
    
    Since the resume() runs setup_timer() every time, it'd be safer to
    have del_timer_sync() in the suspend() as the counterpart.
    Signed-off-by: default avatarNicolin Chen <nicoleotsuka@gmail.com>
    Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
    14b41a29
stmmac_main.c 141 KB