| Message ID | 20231004163531.2864160-1-amelie.delaunay@foss.st.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/3] dmaengine: stm32-mdma: abort resume if no ongoing transfer | expand |
On Wed, 04 Oct 2023 18:35:28 +0200, Amelie Delaunay wrote: > chan->desc can be null, if transfer is terminated when resume is called, > leading to a NULL pointer when retrieving the hwdesc. > To avoid this case, check that chan->desc is not null and channel is > disabled (transfer previously paused or terminated). > > Applied, thanks! [1/3] dmaengine: stm32-mdma: abort resume if no ongoing transfer commit: 81337b9a72dc58a5fa0ae8a042e8cb59f9bdec4a [2/3] dmaengine: stm32-mdma: use Link Address Register to compute residue commit: a4b306eb83579c07b63dc65cd5bae53b7b4019d0 [3/3] dmaengine: stm32-mdma: set in_flight_bytes in case CRQA flag is set commit: 584970421725b7805db84714b857851fdf7203a9 Best regards,
diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c index 0de234022c6d..cc6f4b00091f 100644 --- a/drivers/dma/stm32-mdma.c +++ b/drivers/dma/stm32-mdma.c @@ -1236,6 +1236,10 @@ static int stm32_mdma_resume(struct dma_chan *c) unsigned long flags; u32 status, reg; + /* Transfer can be terminated */ + if (!chan->desc || (stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)) & STM32_MDMA_CCR_EN)) + return -EPERM; + hwdesc = chan->desc->node[chan->curr_hwdesc].hwdesc; spin_lock_irqsave(&chan->vchan.lock, flags);
chan->desc can be null, if transfer is terminated when resume is called, leading to a NULL pointer when retrieving the hwdesc. To avoid this case, check that chan->desc is not null and channel is disabled (transfer previously paused or terminated). Fixes: a4ffb13c8946 ("dmaengine: Add STM32 MDMA driver") Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com> Cc: stable@vger.kernel.org --- drivers/dma/stm32-mdma.c | 4 ++++ 1 file changed, 4 insertions(+)