hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

media: stm32-dcmi: fix DMA corruption when stopping streaming 

Avoid call of dmaengine_terminate_all() between
dmaengine_prep_slave_single() and dmaengine_submit() by locking
the whole DMA submission sequence.

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hugues Fruchet 2019-02-28 12:10:53 -05:00 committed by Mauro Carvalho Chehab
parent ab41b99e7e
commit b3ce6f6ff3
1 changed files with 17 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/media/platform/stm32/stm32-dcmi.c
View File

@ -164,6 +164,9 @@ struct stm32_dcmi {
int errors_count;
int overrun_count;
int buffers_count;
/* Ensure DMA operations atomicity */
struct mutex dma_lock;
};
static inline struct stm32_dcmi *notifier_to_dcmi(struct v4l2_async_notifier *n)
@ -314,6 +317,13 @@ static int dcmi_start_dma(struct stm32_dcmi *dcmi,
return ret;
}
/*
* Avoid call of dmaengine_terminate_all() between
* dmaengine_prep_slave_single() and dmaengine_submit()
* by locking the whole DMA submission sequence
*/
mutex_lock(&dcmi->dma_lock);
/* Prepare a DMA transaction */
desc = dmaengine_prep_slave_single(dcmi->dma_chan, buf->paddr,
buf->size,
@ -322,6 +332,7 @@ static int dcmi_start_dma(struct stm32_dcmi *dcmi,
if (!desc) {
dev_err(dcmi->dev, "%s: DMA dmaengine_prep_slave_single failed for buffer phy=%pad size=%zu\n",
__func__, &buf->paddr, buf->size);
mutex_unlock(&dcmi->dma_lock);
return -EINVAL;
}
@ -333,9 +344,12 @@ static int dcmi_start_dma(struct stm32_dcmi *dcmi,
dcmi->dma_cookie = dmaengine_submit(desc);
if (dma_submit_error(dcmi->dma_cookie)) {
dev_err(dcmi->dev, "%s: DMA submission failed\n", __func__);
mutex_unlock(&dcmi->dma_lock);
return -ENXIO;
}
mutex_unlock(&dcmi->dma_lock);
dma_async_issue_pending(dcmi->dma_chan);
return 0;
@ -720,7 +734,9 @@ static void dcmi_stop_streaming(struct vb2_queue *vq)
spin_unlock_irq(&dcmi->irqlock);
/* Stop all pending DMA operations */
mutex_lock(&dcmi->dma_lock);
dmaengine_terminate_all(dcmi->dma_chan);
mutex_unlock(&dcmi->dma_lock);
pm_runtime_put(dcmi->dev);
@ -1711,6 +1727,7 @@ static int dcmi_probe(struct platform_device *pdev)
spin_lock_init(&dcmi->irqlock);
mutex_init(&dcmi->lock);
mutex_init(&dcmi->dma_lock);
init_completion(&dcmi->complete);
INIT_LIST_HEAD(&dcmi->buffers);