dma: tegra: avoid channel lock up after free
authorDmitry Osipenko <digetx@gmail.com>
Sat, 11 May 2013 16:30:53 +0000 (20:30 +0400)
committerVinod Koul <vinod.koul@intel.com>
Fri, 5 Jul 2013 06:10:38 +0000 (11:40 +0530)
commit7bdc1e272a471062e8f310137c896e2355b46d13
tree0ad98dbe27efd87c30faf9f481f673d2f2da6ed8
parentac7ae754d592571478959833796b7bdf1a3c08da
dma: tegra: avoid channel lock up after free

Lock scenario: Channel 1 was allocated and prepared as slave_sg, used and freed.
Now preparation of cyclic dma on channel 1 will fail with err "DMA configuration
conflict" because tdc->isr_handler still setted to handle_once_dma_done.

This happens because tegra_dma_abort_all() won't be called on channel freeing
if pending list is empty and channel not busy. We need to clear isr_handler
on channel freeing to avoid locking.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
drivers/dma/tegra20-apb-dma.c