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media: nxp: imx8-isi: better handle the m2m usage_count

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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: cf21f328fc ("media: nxp: Add i.MX8 ISI driver")
Cc: stable@vger.kernel.org
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20241023085643.978729-1-laurentiu.palcu@oss.nxp.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Laurentiu Palcu 2024-10-23 11:56:43 +03:00 • committed by Mauro Carvalho Chehab
parent 543f81b86c
commit 910efa6490
1 changed files with 13 additions and 1 deletions
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14
drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c
View file

@ -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;
}