media: atomisp: Drop streamoff_mutex

Now that __atomisp_streamoff() no longer drops isp->mutex to cancel
the watchdog timer, the streamoff_mutex is no longer necessary to
avoid multiple streamoffs racing with each other.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_fops.c

@@ -822,7 +822,6 @@ static int atomisp_release(struct file *file)
 	if (!isp)
 		return -EBADF;
 
-	mutex_lock(&isp->streamoff_mutex);
 	mutex_lock(&isp->mutex);
 
 	dev_dbg(isp->dev, "release device %s\n", vdev->name);
@@ -909,7 +908,6 @@ static int atomisp_release(struct file *file)
 				     V4L2_SEL_TGT_COMPOSE, 0,
 				     &clear_compose);
 	mutex_unlock(&isp->mutex);
-	mutex_unlock(&isp->streamoff_mutex);
 
 	return v4l2_fh_release(file);
 }

drivers/staging/media/atomisp/pci/atomisp_internal.h

@@ -239,12 +239,6 @@ struct atomisp_device {
 	/* Purpose of mutex is to protect and serialize use of isp data
 	 * structures and css API calls. */
 	struct mutex mutex;
-	/*
-	 * Serialise streamoff: mutex is dropped during streamoff to
-	 * cancel the watchdog queue. MUST be acquired BEFORE
-	 * "mutex".
-	 */
-	struct mutex streamoff_mutex;
 
 	unsigned int input_cnt;
 	struct atomisp_input_subdev inputs[ATOM_ISP_MAX_INPUTS];

drivers/staging/media/atomisp/pci/atomisp_ioctl.c

@@ -1872,7 +1872,6 @@ int __atomisp_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
 		atomisp_subdev_source_pad(vdev), asd->index);
 
 	lockdep_assert_held(&isp->mutex);
-	lockdep_assert_held(&isp->streamoff_mutex);
 
 	if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 		dev_dbg(isp->dev, "unsupported v4l2 buf type\n");
@@ -2081,11 +2080,9 @@ static int atomisp_streamoff(struct file *file, void *fh,
 	struct atomisp_device *isp = video_get_drvdata(vdev);
 	int rval;
 
-	mutex_lock(&isp->streamoff_mutex);
 	mutex_lock(&isp->mutex);
 	rval = __atomisp_streamoff(file, fh, type);
 	mutex_unlock(&isp->mutex);
-	mutex_unlock(&isp->streamoff_mutex);
 
 	return rval;
 }

drivers/staging/media/atomisp/pci/atomisp_v4l2.c

@@ -1482,7 +1482,6 @@ static int atomisp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *i
 	dev_dbg(&pdev->dev, "atomisp mmio base: %p\n", isp->base);
 
 	mutex_init(&isp->mutex);
-	mutex_init(&isp->streamoff_mutex);
 	spin_lock_init(&isp->lock);
 
 	/* This is not a true PCI device on SoC, so the delay is not needed. */