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-rw-r--r--drivers/media/radio/radio-si470x.c84
1 files changed, 41 insertions, 43 deletions
diff --git a/drivers/media/radio/radio-si470x.c b/drivers/media/radio/radio-si470x.c
index 5dd33197bbd..707988edc1b 100644
--- a/drivers/media/radio/radio-si470x.c
+++ b/drivers/media/radio/radio-si470x.c
@@ -85,7 +85,7 @@
* Oliver Neukum <oliver@neukum.org>
* Version 1.0.7
* - usb autosuspend support
- * - unplugging fixed
+ * - unplugging fixed
*
* ToDo:
* - add seeking support
@@ -425,7 +425,8 @@ struct si470x_device {
/* driver management */
unsigned int users;
- unsigned char disconnected;
+ unsigned char disconnected;
+ struct mutex disconnect_lock;
/* Silabs internal registers (0..15) */
unsigned short registers[RADIO_REGISTER_NUM];
@@ -442,12 +443,6 @@ struct si470x_device {
/*
- * Lock to prevent kfree of data before all users have releases the device.
- */
-static DEFINE_MUTEX(open_close_lock);
-
-
-/*
* The frequency is set in units of 62.5 Hz when using V4L2_TUNER_CAP_LOW,
* 62.5 kHz otherwise.
* The tuner is able to have a channel spacing of 50, 100 or 200 kHz.
@@ -582,7 +577,7 @@ static int si470x_get_rds_registers(struct si470x_device *radio)
usb_rcvintpipe(radio->usbdev, 1),
(void *) &buf, sizeof(buf), &size, usb_timeout);
if (size != sizeof(buf))
- printk(KERN_WARNING DRIVER_NAME ": si470x_get_rds_registers: "
+ printk(KERN_WARNING DRIVER_NAME ": si470x_get_rds_registers: "
"return size differs: %d != %zu\n", size, sizeof(buf));
if (retval < 0)
printk(KERN_WARNING DRIVER_NAME ": si470x_get_rds_registers: "
@@ -591,7 +586,8 @@ static int si470x_get_rds_registers(struct si470x_device *radio)
if (retval >= 0)
for (regnr = 0; regnr < RDS_REGISTER_NUM; regnr++)
radio->registers[STATUSRSSI + regnr] =
- get_unaligned_be16(&buf[regnr * RADIO_REGISTER_SIZE + 1]);
+ get_unaligned_be16(
+ &buf[regnr * RADIO_REGISTER_SIZE + 1]);
return (retval < 0) ? -EINVAL : 0;
}
@@ -879,8 +875,8 @@ static void si470x_work(struct work_struct *work)
struct si470x_device *radio = container_of(work, struct si470x_device,
work.work);
- if (radio->disconnected)
- return;
+ if (radio->disconnected)
+ return;
if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
return;
@@ -1007,20 +1003,20 @@ static int si470x_fops_open(struct inode *inode, struct file *file)
static int si470x_fops_release(struct inode *inode, struct file *file)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
- int retval = 0;
+ int retval = 0;
if (!radio)
return -ENODEV;
- mutex_lock(&open_close_lock);
+ mutex_lock(&radio->disconnect_lock);
radio->users--;
if (radio->users == 0) {
- if (radio->disconnected) {
- video_unregister_device(radio->videodev);
- kfree(radio->buffer);
- kfree(radio);
- goto done;
- }
+ if (radio->disconnected) {
+ video_unregister_device(radio->videodev);
+ kfree(radio->buffer);
+ kfree(radio);
+ goto unlock;
+ }
/* stop rds reception */
cancel_delayed_work_sync(&radio->work);
@@ -1032,9 +1028,9 @@ static int si470x_fops_release(struct inode *inode, struct file *file)
usb_autopm_put_interface(radio->intf);
}
-done:
- mutex_unlock(&open_close_lock);
- return retval;
+unlock:
+ mutex_unlock(&radio->disconnect_lock);
+ return retval;
}
@@ -1174,8 +1170,8 @@ static int si470x_vidioc_g_ctrl(struct file *file, void *priv,
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
- if (radio->disconnected)
- return -EIO;
+ if (radio->disconnected)
+ return -EIO;
switch (ctrl->id) {
case V4L2_CID_AUDIO_VOLUME:
@@ -1201,8 +1197,8 @@ static int si470x_vidioc_s_ctrl(struct file *file, void *priv,
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
int retval;
- if (radio->disconnected)
- return -EIO;
+ if (radio->disconnected)
+ return -EIO;
switch (ctrl->id) {
case V4L2_CID_AUDIO_VOLUME:
@@ -1266,8 +1262,8 @@ static int si470x_vidioc_g_tuner(struct file *file, void *priv,
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
int retval;
- if (radio->disconnected)
- return -EIO;
+ if (radio->disconnected)
+ return -EIO;
if (tuner->index > 0)
return -EINVAL;
@@ -1324,8 +1320,8 @@ static int si470x_vidioc_s_tuner(struct file *file, void *priv,
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
int retval;
- if (radio->disconnected)
- return -EIO;
+ if (radio->disconnected)
+ return -EIO;
if (tuner->index > 0)
return -EINVAL;
@@ -1351,8 +1347,8 @@ static int si470x_vidioc_g_frequency(struct file *file, void *priv,
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
- if (radio->disconnected)
- return -EIO;
+ if (radio->disconnected)
+ return -EIO;
freq->type = V4L2_TUNER_RADIO;
freq->frequency = si470x_get_freq(radio);
@@ -1370,8 +1366,8 @@ static int si470x_vidioc_s_frequency(struct file *file, void *priv,
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
int retval;
- if (radio->disconnected)
- return -EIO;
+ if (radio->disconnected)
+ return -EIO;
if (freq->type != V4L2_TUNER_RADIO)
return -EINVAL;
@@ -1436,8 +1432,10 @@ static int si470x_usb_driver_probe(struct usb_interface *intf,
memcpy(radio->videodev, &si470x_viddev_template,
sizeof(si470x_viddev_template));
radio->users = 0;
+ radio->disconnected = 0;
radio->usbdev = interface_to_usbdev(intf);
radio->intf = intf;
+ mutex_init(&radio->disconnect_lock);
mutex_init(&radio->lock);
video_set_drvdata(radio->videodev, radio);
@@ -1542,16 +1540,16 @@ static void si470x_usb_driver_disconnect(struct usb_interface *intf)
{
struct si470x_device *radio = usb_get_intfdata(intf);
- mutex_lock(&open_close_lock);
- radio->disconnected = 1;
+ mutex_lock(&radio->disconnect_lock);
+ radio->disconnected = 1;
cancel_delayed_work_sync(&radio->work);
usb_set_intfdata(intf, NULL);
- if (radio->users == 0) {
- video_unregister_device(radio->videodev);
- kfree(radio->buffer);
- kfree(radio);
- }
- mutex_unlock(&open_close_lock);
+ if (radio->users == 0) {
+ video_unregister_device(radio->videodev);
+ kfree(radio->buffer);
+ kfree(radio);
+ }
+ mutex_unlock(&radio->disconnect_lock);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-23 06:42:20 +0000