1. 12 Feb, 2015 1 commit
  2. 11 Feb, 2015 1 commit
    • Addy Ke's avatar
      dmaengine: pl330: fix bug that cause start the same descs in cyclic · 0091b9d6
      Addy Ke authored
      This bug will cause NULL pointer after commit dfac17, and cause
      wrong package in I2S DMA transfer before commit dfac17.
      
      Tested on RK3288-pinky2 board.
      
      Detail:
      I2S DMA transfer(sound/core/pcm_dmaengine.c):
      dmaengine_pcm_prepare_and_submit -->
      dmaengine_prep_dma_cyclic -->
      pl330_prep_dma_cyclic -->
      the case:
      1. pl330_submit_req(desc0): thrd->req[0].desc = desc0, thrd->lstenq = 0
      2. pl330_submit_req(desc1): thrd->req[1].desc = desc1, thrd->lstenq = 1
      3. _start(desc0) by submit_req: thrd->req_running = 0
         because: idx = 1 - thrd->lstenq = 0
      4. pl330_update(desc0 OK): thrd->req[0].desc = NULL, desc0 to req_done list
         because: idx = active = thrd->req_running = 0
      5. _start(desc1) by pl330_update: thrd->req_running = 1
         because:
         idx = 1 - thrd->lstenq = 0, but thrd->req[0].desc == NULL,
         so:
         idx = thrd->lstenq = 1
      6. pl330_submit_req(desc2): thrd->req[0].desc = desc2, thrd->lstenq = 0
      7. _start(desc1) by submit_req: thrd->req_running = 1
         because: idx = 1 - thrd->lstenq = 1
         Note: _start started the same descs
               _start should start desc2 here, NOT desc1
      
      8. pl330_update(desc1 OK): thrd->req[1].desc = NULL, desc1 to req_done list
         because: idx = active = thrd->req_running = 1
      9. _start(desc2) by pl330_update : thrd->req_running = 0
         because: idx = 1 - thrd->lstenq = 0
      10.pl330_update(desc1 OK, NOT desc2): thrd->req[0].desc = NULL,
         desc2 to req_done list
         because: idx = active = thrd->req_running = 0
      
      11.pl330_submit_req(desc3): thrd->req[0].desc = desc3, thrd->lstenq = 0
      12.pl330_submit_req(desc4): thrd->req[1].desc = desc4, thrd->lstenq = 1
      13._start(desc3) by submit_req: thrd->req_running = 0
         because: idx = 1 - thrd->lstenq = 0
      14.pl330_update(desc2 OK NOT desc3): thrd->req[0].desc = NULL
         desc3 to req_done list
         because: idx = active = thrd->req_running = 0
      15._start(desc4) by pl330_update: thrd->req_running = 1
         because:
         idx = 1 - thrd->lstenq = 0, but thrd->req[0].desc == NULL,
         so:
         idx = thrd->lstenq = 1
      16.pl330_submit_req(desc5): thrd->req[0].desc = desc5, thrd->lstenq = 0
      17._start(desc4) by submit_req: thrd->req_running = 1
         because: idx = 1 - thrd->lstenq = 1
      18.pl330_update(desc3 OK NOT desc4): thrd->req[1].desc = NULL
         desc4 to req_done list
         because: idx = active = thrd->req_running = 1
      19._start(desc4) by pl330_update: thrd->req_running = 0
         because:
         idx = 1 - thrd->lstenq = 1, but thrd->req[1].desc == NULL,
         so:
         idx = thrd->lstenq = 0
      20.pl330_update(desc4 OK): thrd->req[0].desc = NULL, desc5 to req_done list
         because: idx = active = thrd->req_running = 0
      21.pl330_update(desc4 OK):
         1) before commit dfac17(set req_running -1 in pl330_update/mark_free()):
            because: active = -1, abort
            result: desc0-desc5's callback are all called,
      	      but step 10 and step 18 go wrong.
         2) before commit dfac17:
            idx = active = thrd->req_runnig = 0 -->
            descdone = thrd->req[0] = NULL -->
            list_add_tail(&descdone->rqd, &pl330->req_done); -->
            got NULL pointer!!!
      Signed-off-by: default avatarAddy Ke <addy.ke@rock-chips.com>
      Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
      0091b9d6
  3. 05 Feb, 2015 12 commits
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  9. 13 Jan, 2015 13 commits