From: Hans Verkuil <hans.verk...@cisco.com>
Add proper locking to the file operations, allowing for the removal
of the V4L2_FL_LOCK_ALL_FOPS flag.
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
---
drivers/media/radio/wl128x/fmdrv_v4l2.c | 38 +++++++++++++++++++++----------
1 file changed, 26 insertions(+), 12 deletions(-)
diff --git a/drivers/media/radio/wl128x/fmdrv_v4l2.c
b/drivers/media/radio/wl128x/fmdrv_v4l2.c
index 49a11ec..db2248e 100644
--- a/drivers/media/radio/wl128x/fmdrv_v4l2.c
+++ b/drivers/media/radio/wl128x/fmdrv_v4l2.c
@@ -56,23 +56,29 @@ static ssize_t fm_v4l2_fops_read(struct file *file, char
__user * buf,
return -EIO;
}
- /* Turn on RDS mode , if it is disabled */
+ if (mutex_lock_interruptible(&fmdev->mutex))
+ return -ERESTARTSYS;
+
+ /* Turn on RDS mode if it is disabled */
ret = fm_rx_get_rds_mode(fmdev, &rds_mode);
if (ret < 0) {
fmerr("Unable to read current rds mode\n");
- return ret;
+ goto read_unlock;
}
if (rds_mode == FM_RDS_DISABLE) {
ret = fmc_set_rds_mode(fmdev, FM_RDS_ENABLE);
if (ret < 0) {
fmerr("Failed to enable rds mode\n");
- return ret;
+ goto read_unlock;
}
}
/* Copy RDS data from internal buffer to user buffer */
- return fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count);
+ ret = fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count);
+read_unlock:
+ mutex_unlock(&fmdev->mutex);
+ return ret;
}
/* Write TX RDS data */
@@ -91,8 +97,11 @@ static ssize_t fm_v4l2_fops_write(struct file *file, const
char __user * buf,
return -EFAULT;
fmdev = video_drvdata(file);
+ if (mutex_lock_interruptible(&fmdev->mutex))
+ return -ERESTARTSYS;
fm_tx_set_radio_text(fmdev, rds.text, rds.text_type);
fm_tx_set_af(fmdev, rds.af_freq);
+ mutex_unlock(&fmdev->mutex);
return sizeof(rds);
}
@@ -103,7 +112,9 @@ static u32 fm_v4l2_fops_poll(struct file *file, struct
poll_table_struct *pts)
struct fmdev *fmdev;
fmdev = video_drvdata(file);
+ mutex_lock(&fmdev->mutex);
ret = fmc_is_rds_data_available(fmdev, file, pts);
+ mutex_unlock(&fmdev->mutex);
if (ret < 0)
return POLLIN | POLLRDNORM;
@@ -127,10 +138,12 @@ static int fm_v4l2_fops_open(struct file *file)
fmdev = video_drvdata(file);
+ if (mutex_lock_interruptible(&fmdev->mutex))
+ return -ERESTARTSYS;
ret = fmc_prepare(fmdev);
if (ret < 0) {
fmerr("Unable to prepare FM CORE\n");
- return ret;
+ goto open_unlock;
}
fmdbg("Load FM RX firmware..\n");
@@ -138,10 +151,12 @@ static int fm_v4l2_fops_open(struct file *file)
ret = fmc_set_mode(fmdev, FM_MODE_RX);
if (ret < 0) {
fmerr("Unable to load FM RX firmware\n");
- return ret;
+ goto open_unlock;
}
radio_disconnected = 1;
+open_unlock:
+ mutex_unlock(&fmdev->mutex);
return ret;
}
@@ -156,19 +171,22 @@ static int fm_v4l2_fops_release(struct file *file)
return 0;
}
+ mutex_lock(&fmdev->mutex);
ret = fmc_set_mode(fmdev, FM_MODE_OFF);
if (ret < 0) {
fmerr("Unable to turn off the chip\n");
- return ret;
+ goto release_unlock;
}
ret = fmc_release(fmdev);
if (ret < 0) {
fmerr("FM CORE release failed\n");
- return ret;
+ goto release_unlock;
}
radio_disconnected = 0;
+release_unlock:
+ mutex_unlock(&fmdev->mutex);
return ret;
}
@@ -520,10 +538,6 @@ int fm_v4l2_init_video_device(struct fmdev *fmdev, int
radio_nr)
video_set_drvdata(gradio_dev, fmdev);
gradio_dev->lock = &fmdev->mutex;
- /* Locking in file operations other than ioctl should be done
- by the driver, not the V4L2 core.
- This driver needs auditing so that this flag can be removed. */
- set_bit(V4L2_FL_LOCK_ALL_FOPS, &gradio_dev->flags);
/* Register with V4L2 subsystem as RADIO device */
if (video_register_device(gradio_dev, VFL_TYPE_RADIO, radio_nr)) {
--
1.7.10
--
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