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dmaengine: sprd: Add validation of current descriptor in irq handler 

When user terminates one DMA channel to free all its descriptors, but
at the same time one transaction interrupt was triggered possibly, now
we should not handle this interrupt by validating if the 'schan->cur_desc'
was set as NULL to avoid crashing the kernel.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Baolin Wang 2019-05-06 15:28:29 +08:00 committed by Vinod Koul
parent 16d0f85e45
commit 58152b0e57
1 changed files with 7 additions and 2 deletions
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9
drivers/dma/sprd-dma.c
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@ -552,12 +552,17 @@ static irqreturn_t dma_irq_handle(int irq, void *dev_id)
schan = &sdev->channels[i];
spin_lock(&schan->vc.lock);
sdesc = schan->cur_desc;
if (!sdesc) {
spin_unlock(&schan->vc.lock);
return IRQ_HANDLED;
}
int_type = sprd_dma_get_int_type(schan);
req_type = sprd_dma_get_req_type(schan);
sprd_dma_clear_int(schan);
sdesc = schan->cur_desc;
/* cyclic mode schedule callback */
cyclic = schan->linklist.phy_addr ? true : false;
if (cyclic == true) {