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charset="utf-8" Currently, if streamon/streamoff calls are imbalanced we can end up with a negative ISI m2m usage_count. When that happens, the next streamon call will not enable the ISI m2m channel. So, instead of throwing a warning in streamoff when usage_count drops below 0, just make sure we don't get there. Fixes: cf21f328fcafac ("media: nxp: Add i.MX8 ISI driver") Signed-off-by: Laurentiu Palcu --- drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c b/drivers/m= edia/platform/nxp/imx8-isi/imx8-isi-m2m.c index 9745d6219a166..b71195a3ba256 100644 --- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c +++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-m2m.c @@ -575,6 +575,9 @@ static int mxc_isi_m2m_streamoff(struct file *file, voi= d *fh, =20 mutex_lock(&m2m->lock); =20 + if (m2m->usage_count =3D=3D 0) + goto unlock; + /* * If the last context is this one, reset it to make sure the device * will be reconfigured when streaming is restarted. @@ -594,8 +597,7 @@ static int mxc_isi_m2m_streamoff(struct file *file, voi= d *fh, mxc_isi_channel_release(m2m->pipe); } =20 - WARN_ON(m2m->usage_count < 0); - +unlock: mutex_unlock(&m2m->lock); =20 return 0; --=20 2.34.1