The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 55a6c6b2be3d6670bf5772364d8208bd8dc17da4 Mon Sep 17 00:00:00 2001
From: Sakari Ailus sakari.ailus@linux.intel.com Date: Thu, 8 Oct 2020 21:29:38 +0200 Subject: [PATCH] media: ipu3-cio2: Serialise access to pad format
Pad format can be accessed from user space. Serialise access to it.
Fixes: c2a6a07afe4a ("media: intel-ipu3: cio2: add new MIPI-CSI2 driver") Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Reviewed-by: Bingbu Cao bingbu.cao@intel.com Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Cc: stable@vger.kernel.org # v4.16 and up Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org
diff --git a/drivers/media/pci/intel/ipu3/ipu3-cio2.c b/drivers/media/pci/intel/ipu3/ipu3-cio2.c index afa472026ba4..b3a08196e08c 100644 --- a/drivers/media/pci/intel/ipu3/ipu3-cio2.c +++ b/drivers/media/pci/intel/ipu3/ipu3-cio2.c @@ -1233,11 +1233,15 @@ static int cio2_subdev_get_fmt(struct v4l2_subdev *sd, { struct cio2_queue *q = container_of(sd, struct cio2_queue, subdev);
+ mutex_lock(&q->subdev_lock); + if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) fmt->format = *v4l2_subdev_get_try_format(sd, cfg, fmt->pad); else fmt->format = q->subdev_fmt;
+ mutex_unlock(&q->subdev_lock); + return 0; }
@@ -1261,6 +1265,8 @@ static int cio2_subdev_set_fmt(struct v4l2_subdev *sd, if (fmt->pad == CIO2_PAD_SOURCE) return cio2_subdev_get_fmt(sd, cfg, fmt);
+ mutex_lock(&q->subdev_lock); + if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) { *v4l2_subdev_get_try_format(sd, cfg, fmt->pad) = fmt->format; } else { @@ -1271,6 +1277,8 @@ static int cio2_subdev_set_fmt(struct v4l2_subdev *sd, fmt->format = q->subdev_fmt; }
+ mutex_unlock(&q->subdev_lock); + return 0; }
@@ -1529,6 +1537,7 @@ static int cio2_queue_init(struct cio2_device *cio2, struct cio2_queue *q)
/* Initialize miscellaneous variables */ mutex_init(&q->lock); + mutex_init(&q->subdev_lock);
/* Initialize formats to default values */ fmt = &q->subdev_fmt; @@ -1645,6 +1654,7 @@ static int cio2_queue_init(struct cio2_device *cio2, struct cio2_queue *q) fail_subdev_media_entity: cio2_fbpt_exit(q, &cio2->pci_dev->dev); fail_fbpt: + mutex_destroy(&q->subdev_lock); mutex_destroy(&q->lock);
return r; @@ -1657,6 +1667,7 @@ static void cio2_queue_exit(struct cio2_device *cio2, struct cio2_queue *q) v4l2_device_unregister_subdev(&q->subdev); media_entity_cleanup(&q->subdev.entity); cio2_fbpt_exit(q, &cio2->pci_dev->dev); + mutex_destroy(&q->subdev_lock); mutex_destroy(&q->lock); }
diff --git a/drivers/media/pci/intel/ipu3/ipu3-cio2.h b/drivers/media/pci/intel/ipu3/ipu3-cio2.h index 549b08f88f0c..146492383aa5 100644 --- a/drivers/media/pci/intel/ipu3/ipu3-cio2.h +++ b/drivers/media/pci/intel/ipu3/ipu3-cio2.h @@ -335,6 +335,7 @@ struct cio2_queue {
/* Subdev, /dev/v4l-subdevX */ struct v4l2_subdev subdev; + struct mutex subdev_lock; /* Serialise acces to subdev_fmt field */ struct media_pad subdev_pads[CIO2_PADS]; struct v4l2_mbus_framefmt subdev_fmt; atomic_t frame_sequence;