On Wed Oct 23 11:56:43 2024 +0300, Laurentiu Palcu wrote:
> Currently, if streamon/streamoff calls are imbalanced we can either end up
> with a negative ISI m2m usage_count (if streamoff() is called more times
> than streamon()) in which case we'll not be able to restart the ISI pipe
> next time, or the usage_count never gets to 0 and the pipe is never
> switched off.
>
> To avoid that, add a 'streaming' flag to mxc_isi_m2m_ctx_queue_data and use it
> in the streamon/streamoff to avoid incrementing/decrementing the usage_count
> uselessly, if called multiple times from the same context.
>
> Fixes: cf21f328fcafac ("media: nxp: Add i.MX8 ISI driver")
> Cc: [email protected]
> Suggested-by: Laurent Pinchart <[email protected]>
> Signed-off-by: Laurentiu Palcu <[email protected]>
> Reviewed-by: Laurent Pinchart <[email protected]>
> Link:
> https://lore.kernel.org/r/[email protected]
> Signed-off-by: Laurent Pinchart <[email protected]>
> Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Patch committed.
Thanks,
Mauro Carvalho Chehab
drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
---
diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c
b/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c
index 794050a6a919..22e49d3a1287 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c
@@ -43,6 +43,7 @@ struct mxc_isi_m2m_ctx_queue_data {
struct v4l2_pix_format_mplane format;
const struct mxc_isi_format_info *info;
u32 sequence;
+ bool streaming;
};
struct mxc_isi_m2m_ctx {
@@ -484,15 +485,18 @@ static int mxc_isi_m2m_streamon(struct file *file, void
*fh,
enum v4l2_buf_type type)
{
struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh);
+ struct mxc_isi_m2m_ctx_queue_data *q = mxc_isi_m2m_ctx_qdata(ctx, type);
const struct v4l2_pix_format_mplane *out_pix = &ctx->queues.out.format;
const struct v4l2_pix_format_mplane *cap_pix = &ctx->queues.cap.format;
const struct mxc_isi_format_info *cap_info = ctx->queues.cap.info;
const struct mxc_isi_format_info *out_info = ctx->queues.out.info;
struct mxc_isi_m2m *m2m = ctx->m2m;
bool bypass;
-
int ret;
+ if (q->streaming)
+ return 0;
+
mutex_lock(&m2m->lock);
if (m2m->usage_count == INT_MAX) {
@@ -545,6 +549,8 @@ static int mxc_isi_m2m_streamon(struct file *file, void *fh,
goto unchain;
}
+ q->streaming = true;
+
return 0;
unchain:
@@ -567,10 +573,14 @@ static int mxc_isi_m2m_streamoff(struct file *file, void
*fh,
enum v4l2_buf_type type)
{
struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh);
+ struct mxc_isi_m2m_ctx_queue_data *q = mxc_isi_m2m_ctx_qdata(ctx, type);
struct mxc_isi_m2m *m2m = ctx->m2m;
v4l2_m2m_ioctl_streamoff(file, fh, type);
+ if (!q->streaming)
+ return 0;
+
mutex_lock(&m2m->lock);
/*
@@ -596,6 +606,8 @@ static int mxc_isi_m2m_streamoff(struct file *file, void
*fh,
mutex_unlock(&m2m->lock);
+ q->streaming = false;
+
return 0;
}
