system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-11-05 18:23:50 +00:00
Code Issues Projects Releases Packages Wiki Activity

dmaengine: sprd: Fix the possible crash when getting descriptor status

Browse source 
We will get a NULL virtual descriptor by vchan_find_desc() when the descriptor
has been submitted, that will crash the kernel when getting the descriptor
status.

In this case, since the descriptor has been submitted to process, but it
is not completed now, which means the descriptor is listed into the
'vc->desc_submitted' list now. So we can not get current processing descriptor
by vchan_find_desc(), but the pointer 'schan->cur_desc' will point to the
current processing descriptor, then we can use 'schan->cur_desc' to get
current processing descriptor's status to avoid this issue.

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 15:28:28 +08:00 committed by Vinod Koul
parent 492252493e
commit 16d0f85e45
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/dma/sprd-dma.c
View file

@ -625,7 +625,7 @@ static enum dma_status sprd_dma_tx_status(struct dma_chan *chan,
else
pos = 0;
} else if (schan->cur_desc && schan->cur_desc->vd.tx.cookie == cookie) {
struct sprd_dma_desc *sdesc = to_sprd_dma_desc(vd);
struct sprd_dma_desc *sdesc = schan->cur_desc;
if (sdesc->dir == DMA_DEV_TO_MEM)
pos = sprd_dma_get_dst_addr(schan);