tree c9d66a25fab25615b58e869f32d8b4a3e4e78503
parent d64e9a2c750930272492952c16f3f2c95311a6c9
author Hsin-Yu Chao <hychao@chromium.org> 1471943815 +0800
committer Vinod Koul <vinod.koul@intel.com> 1473421962 +0530

dmaengine: pl330: Acquire dmac's spinlock in pl330_tx_status

There is a racing when accessing dmac thread in pl330_tx_status that
the pl330_update is handling active request at the same time and
changing the status of descriptors. This could cause an invalid
transferred count from BUSY descriptor added up to the residual number.
Fix the bug by using the dmac's spinlock in pl330_tx_status to protect
thread resources from changing.
Note that the nested order of holding dmac's and dma_chan's spinlock is
consistent with the rest of the driver: dma_chan first and then dmac,
so it is safe from deadlock scenario.

Signed-off-by: Hsin-Yu Chao <hychao@chromium.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>