| Message ID | 20210815024915.1183417-3-niklas.soderlund+renesas@ragnatech.se (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | rcar-csi2: Serialize format cfg and improve mutex handling | expand |
Hi Niklas, On Sun, Aug 15, 2021 at 04:49:15AM +0200, Niklas Söderlund wrote: > The access to the internal storage of the format rcar_csi2.mf should be > serialized, extend the exciting lock mutex to also cover this. truly an exciting lock mutex indeed! :D > > While at it document the mutex. > > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Thanks j > --- > drivers/media/platform/rcar-vin/rcar-csi2.c | 11 +++++++++-- > 1 file changed, 9 insertions(+), 2 deletions(-) > > diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c > index a02573dbd5da4f62..2fdfdc38de424c72 100644 > --- a/drivers/media/platform/rcar-vin/rcar-csi2.c > +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c > @@ -370,9 +370,8 @@ struct rcar_csi2 { > struct v4l2_subdev *remote; > unsigned int remote_pad; > > + struct mutex lock; /* Protects mf and stream_count. */ > struct v4l2_mbus_framefmt mf; > - > - struct mutex lock; > int stream_count; > > unsigned short lanes; > @@ -725,6 +724,8 @@ static int rcsi2_set_pad_format(struct v4l2_subdev *sd, > struct rcar_csi2 *priv = sd_to_csi2(sd); > struct v4l2_mbus_framefmt *framefmt; > > + mutex_lock(&priv->lock); > + > if (!rcsi2_code_to_fmt(format->format.code)) > format->format.code = rcar_csi2_formats[0].code; > > @@ -735,6 +736,8 @@ static int rcsi2_set_pad_format(struct v4l2_subdev *sd, > *framefmt = format->format; > } > > + mutex_unlock(&priv->lock); > + > return 0; > } > > @@ -744,11 +747,15 @@ static int rcsi2_get_pad_format(struct v4l2_subdev *sd, > { > struct rcar_csi2 *priv = sd_to_csi2(sd); > > + mutex_lock(&priv->lock); > + > if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) > format->format = priv->mf; > else > format->format = *v4l2_subdev_get_try_format(sd, sd_state, 0); > > + mutex_unlock(&priv->lock); > + > return 0; > } > > -- > 2.32.0 >
diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c index a02573dbd5da4f62..2fdfdc38de424c72 100644 --- a/drivers/media/platform/rcar-vin/rcar-csi2.c +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c @@ -370,9 +370,8 @@ struct rcar_csi2 { struct v4l2_subdev *remote; unsigned int remote_pad; + struct mutex lock; /* Protects mf and stream_count. */ struct v4l2_mbus_framefmt mf; - - struct mutex lock; int stream_count; unsigned short lanes; @@ -725,6 +724,8 @@ static int rcsi2_set_pad_format(struct v4l2_subdev *sd, struct rcar_csi2 *priv = sd_to_csi2(sd); struct v4l2_mbus_framefmt *framefmt; + mutex_lock(&priv->lock); + if (!rcsi2_code_to_fmt(format->format.code)) format->format.code = rcar_csi2_formats[0].code; @@ -735,6 +736,8 @@ static int rcsi2_set_pad_format(struct v4l2_subdev *sd, *framefmt = format->format; } + mutex_unlock(&priv->lock); + return 0; } @@ -744,11 +747,15 @@ static int rcsi2_get_pad_format(struct v4l2_subdev *sd, { struct rcar_csi2 *priv = sd_to_csi2(sd); + mutex_lock(&priv->lock); + if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) format->format = priv->mf; else format->format = *v4l2_subdev_get_try_format(sd, sd_state, 0); + mutex_unlock(&priv->lock); + return 0; }
The access to the internal storage of the format rcar_csi2.mf should be serialized, extend the exciting lock mutex to also cover this. While at it document the mutex. Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> --- drivers/media/platform/rcar-vin/rcar-csi2.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)