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authorDmitry Osipenko <digetx@gmail.com>2013-05-11 20:30:53 +0400
committerVinod Koul <vinod.koul@intel.com>2013-07-05 11:40:38 +0530
commit7bdc1e272a471062e8f310137c896e2355b46d13 (patch)
tree0ad98dbe27efd87c30faf9f481f673d2f2da6ed8
parentac7ae754d592571478959833796b7bdf1a3c08da (diff)
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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>
-rw-r--r--drivers/dma/tegra20-apb-dma.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 5953547a5f75..f137914d7b16 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -1191,6 +1191,7 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc)
list_splice_init(&tdc->free_dma_desc, &dma_desc_list);
INIT_LIST_HEAD(&tdc->cb_desc);
tdc->config_init = false;
+ tdc->isr_handler = NULL;
spin_unlock_irqrestore(&tdc->lock, flags);
while (!list_empty(&dma_desc_list)) {