1. 26 Oct, 2015 13 commits
  2. 21 Oct, 2015 1 commit
  3. 30 Sep, 2015 1 commit
  4. 29 Sep, 2015 1 commit
  5. 31 Aug, 2015 1 commit
    • Jialing Fu's avatar
      mmc: core: fix race condition in mmc_wait_data_done · 71f8a4b8
      Jialing Fu authored
      The following panic is captured in ker3.14, but the issue still exists
      in latest kernel.
      ---------------------------------------------------------------------
      [   20.738217] c0 3136 (Compiler) Unable to handle kernel NULL pointer dereference
      at virtual address 00000578
      ......
      [   20.738499] c0 3136 (Compiler) PC is at _raw_spin_lock_irqsave+0x24/0x60
      [   20.738527] c0 3136 (Compiler) LR is at _raw_spin_lock_irqsave+0x20/0x60
      [   20.740134] c0 3136 (Compiler) Call trace:
      [   20.740165] c0 3136 (Compiler) [<ffffffc0008ee900>] _raw_spin_lock_irqsave+0x24/0x60
      [   20.740200] c0 3136 (Compiler) [<ffffffc0000dd024>] __wake_up+0x1c/0x54
      [   20.740230] c0 3136 (Compiler) [<ffffffc000639414>] mmc_wait_data_done+0x28/0x34
      [   20.740262] c0 3136 (Compiler) [<ffffffc0006391a0>] mmc_request_done+0xa4/0x220
      [   20.740314] c0 3136 (Compiler) [<ffffffc000656894>] sdhci_tasklet_finish+0xac/0x264
      [   20.740352] c0 3136 (Compiler) [<ffffffc0000a2b58>] tasklet_action+0xa0/0x158
      [   20.740382] c0 3136 (Compiler) [<ffffffc0000a2078>] __do_softirq+0x10c/0x2e4
      [   20.740411] c0 3136 (Compiler) [<ffffffc0000a24bc>] irq_exit+0x8c/0xc0
      [   20.740439] c0 3136 (Compiler) [<ffffffc00008489c>] handle_IRQ+0x48/0xac
      [   20.740469] c0 3136 (Compiler) [<ffffffc000081428>] gic_handle_irq+0x38/0x7c
      ----------------------------------------------------------------------
      Because in SMP, "mrq" has race condition between below two paths:
      path1: CPU0: <tasklet context>
        static void mmc_wait_data_done(struct mmc_request *mrq)
        {
           mrq->host->context_info.is_done_rcv = true;
           //
           // If CPU0 has just finished "is_done_rcv = true" in path1, and at
           // this moment, IRQ or ICache line missing happens in CPU0.
           // What happens in CPU1 (path2)?
           //
           // If the mmcqd thread in CPU1(path2) hasn't entered to sleep mode:
           // path2 would have chance to break from wait_event_interruptible
           // in mmc_wait_for_data_req_done and continue to run for next
           // mmc_request (mmc_blk_rw_rq_prep).
           //
           // Within mmc_blk_rq_prep, mrq is cleared to 0.
           // If below line still gets host from "mrq" as the result of
           // compiler, the panic happens as we traced.
           wake_up_interruptible(&mrq->host->context_info.wait);
        }
      
      path2: CPU1: <The mmcqd thread runs mmc_queue_thread>
        static int mmc_wait_for_data_req_done(...
        {
           ...
           while (1) {
                 wait_event_interruptible(context_info->wait,
                         (context_info->is_done_rcv ||
                          context_info->is_new_req));
           	   static void mmc_blk_rw_rq_prep(...
                 {
                 ...
                 memset(brq, 0, sizeof(struct mmc_blk_request));
      
      This issue happens very coincidentally; however adding mdelay(1) in
      mmc_wait_data_done as below could duplicate it easily.
      
         static void mmc_wait_data_done(struct mmc_request *mrq)
         {
           mrq->host->context_info.is_done_rcv = true;
      +    mdelay(1);
           wake_up_interruptible(&mrq->host->context_info.wait);
          }
      
      At runtime, IRQ or ICache line missing may just happen at the same place
      of the mdelay(1).
      
      This patch gets the mmc_context_info at the beginning of function, it can
      avoid this race condition.
      Signed-off-by: default avatarJialing Fu <jlfu@marvell.com>
      Tested-by: default avatarShawn Lin <shawn.lin@rock-chips.com>
      Fixes: 2220eedf ("mmc: fix async request mechanism ....")
      Signed-off-by: default avatarShawn Lin <shawn.lin@rock-chips.com>
      Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
      71f8a4b8
  6. 27 Aug, 2015 3 commits
  7. 17 Aug, 2015 1 commit
  8. 04 Jun, 2015 3 commits
  9. 01 Jun, 2015 16 commits