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Message-Id: <2eecd528e85377f03e6fbc5e7d6544b9c9f59cb1.1555330115.git.baolin.wang@linaro.org> Date: Mon, 15 Apr 2019 20:14:55 +0800 From: Baolin Wang <baolin.wang@...aro.org> To: dan.j.williams@...el.com, vkoul@...nel.org Cc: eric.long@...soc.com, orsonzhai@...il.com, zhang.lyra@...il.com, broonie@...nel.org, baolin.wang@...aro.org, dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH 1/7] dmaengine: sprd: Fix the possible crash when getting engine status 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 engine status. In this case, since the descriptor has been submitted, which means the pointer 'schan->cur_desc' will point to the current descriptor, then we can use 'schan->cur_desc' to get the engine status to avoid this issue. Signed-off-by: Baolin Wang <baolin.wang@...aro.org> --- drivers/dma/sprd-dma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c index 48431e2..e29342a 100644 --- a/drivers/dma/sprd-dma.c +++ b/drivers/dma/sprd-dma.c @@ -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); -- 1.7.9.5
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