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dma: tegra: avoid channel lock up after free

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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 <[email protected]>
Acked-by: Stephen Warren <[email protected]>
Acked-by: Laxman Dewangan <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>
This commit is contained in:
Dmitry Osipenko 2013-05-11 20:30:53 +04:00 • committed by Vinod Koul
commit 7bdc1e272a
1 changed files with 1 additions and 0 deletions
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1
drivers/dma/tegra20-apb-dma.c
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@ -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)) {