[media] dsbr100: convert to unlocked_ioctl

Use core-assisted locking so .ioctl can be replaced by .unlocked_ioctl.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 31 insertions, 48 deletions

diff --git a/drivers/media/radio/dsbr100.c b/drivers/media/radio/dsbr100.c
index ed9cd7ad0604..bf2dd6ff042a 100644
--- a/drivers/media/radio/dsbr100.c
+++ b/drivers/media/radio/dsbr100.c
@@ -148,7 +148,7 @@ struct dsbr100_device {
         struct v4l2_device v4l2_dev;
 
         u8 *transfer_buffer;
-        struct mutex lock;      /* buffer locking */
+        struct mutex v4l2_lock;
         int curfreq;
         int stereo;
         int removed;
@@ -182,8 +182,6 @@ static int dsbr100_start(struct dsbr100_device *radio)
         int retval;
         int request;
 
-        mutex_lock(&radio->lock);
-
         retval = usb_control_msg(radio->usbdev,
                 usb_rcvctrlpipe(radio->usbdev, 0),
                 USB_REQ_GET_STATUS,
@@ -207,11 +205,9 @@ static int dsbr100_start(struct dsbr100_device *radio)
         }
 
         radio->status = STARTED;
-        mutex_unlock(&radio->lock);
         return (radio->transfer_buffer)[0];
 
 usb_control_msg_failed:
-        mutex_unlock(&radio->lock);
         dev_err(&radio->usbdev->dev,
                 "%s - usb_control_msg returned %i, request %i\n",
                         __func__, retval, request);
@@ -225,8 +221,6 @@ static int dsbr100_stop(struct dsbr100_device *radio)
         int retval;
         int request;
 
-        mutex_lock(&radio->lock);
-
         retval = usb_control_msg(radio->usbdev,
                 usb_rcvctrlpipe(radio->usbdev, 0),
                 USB_REQ_GET_STATUS,
@@ -250,11 +244,9 @@ static int dsbr100_stop(struct dsbr100_device *radio)
         }
 
         radio->status = STOPPED;
-        mutex_unlock(&radio->lock);
         return (radio->transfer_buffer)[0];
 
 usb_control_msg_failed:
-        mutex_unlock(&radio->lock);
         dev_err(&radio->usbdev->dev,
                 "%s - usb_control_msg returned %i, request %i\n",
                         __func__, retval, request);
@@ -269,8 +261,6 @@ static int dsbr100_setfreq(struct dsbr100_device *radio)
         int request;
         int freq = (radio->curfreq / 16 * 80) / 1000 + 856;
 
-        mutex_lock(&radio->lock);
-
         retval = usb_control_msg(radio->usbdev,
                 usb_rcvctrlpipe(radio->usbdev, 0),
                 DSB100_TUNE,
@@ -306,12 +296,10 @@ static int dsbr100_setfreq(struct dsbr100_device *radio)
         }
 
         radio->stereo = !((radio->transfer_buffer)[0] & 0x01);
-        mutex_unlock(&radio->lock);
         return (radio->transfer_buffer)[0];
 
 usb_control_msg_failed:
         radio->stereo = -1;
-        mutex_unlock(&radio->lock);
         dev_err(&radio->usbdev->dev,
                 "%s - usb_control_msg returned %i, request %i\n",
                         __func__, retval, request);
@@ -324,8 +312,6 @@ static void dsbr100_getstat(struct dsbr100_device *radio)
 {
         int retval;
 
-        mutex_lock(&radio->lock);
-
         retval = usb_control_msg(radio->usbdev,
                 usb_rcvctrlpipe(radio->usbdev, 0),
                 USB_REQ_GET_STATUS,
@@ -340,33 +326,8 @@ static void dsbr100_getstat(struct dsbr100_device *radio)
         } else {
                 radio->stereo = !(radio->transfer_buffer[0] & 0x01);
         }
-
-        mutex_unlock(&radio->lock);
-}
-
-/* USB subsystem interface begins here */
-
-/*
- * Handle unplugging of the device.
- * We call video_unregister_device in any case.
- * The last function called in this procedure is
- * usb_dsbr100_video_device_release
- */
-static void usb_dsbr100_disconnect(struct usb_interface *intf)
-{
-        struct dsbr100_device *radio = usb_get_intfdata(intf);
-
-        usb_set_intfdata (intf, NULL);
-
-        mutex_lock(&radio->lock);
-        radio->removed = 1;
-        mutex_unlock(&radio->lock);
-
-        video_unregister_device(&radio->videodev);
-        v4l2_device_disconnect(&radio->v4l2_dev);
 }
 
-
 static int vidioc_querycap(struct file *file, void *priv,
                                         struct v4l2_capability *v)
 {
@@ -432,9 +393,7 @@ static int vidioc_s_frequency(struct file *file, void *priv,
         if (radio->removed)
                 return -EIO;
 
-        mutex_lock(&radio->lock);
         radio->curfreq = f->frequency;
-        mutex_unlock(&radio->lock);
 
         retval = dsbr100_setfreq(radio);
         if (retval < 0)
@@ -548,12 +507,36 @@ static int vidioc_s_audio(struct file *file, void *priv,
         return 0;
 }
 
+/* USB subsystem interface begins here */
+
+/*
+ * Handle unplugging of the device.
+ * We call video_unregister_device in any case.
+ * The last function called in this procedure is
+ * usb_dsbr100_video_device_release
+ */
+static void usb_dsbr100_disconnect(struct usb_interface *intf)
+{
+        struct dsbr100_device *radio = usb_get_intfdata(intf);
+
+        usb_set_intfdata(intf, NULL);
+
+        mutex_lock(&radio->v4l2_lock);
+        radio->removed = 1;
+        mutex_unlock(&radio->v4l2_lock);
+
+        video_unregister_device(&radio->videodev);
+        v4l2_device_disconnect(&radio->v4l2_dev);
+}
+
+
 /* Suspend device - stop device. */
 static int usb_dsbr100_suspend(struct usb_interface *intf, pm_message_t message)
 {
         struct dsbr100_device *radio = usb_get_intfdata(intf);
         int retval;
 
+        mutex_lock(&radio->v4l2_lock);
         if (radio->status == STARTED) {
                 retval = dsbr100_stop(radio);
                 if (retval < 0)
@@ -564,11 +547,9 @@ static int usb_dsbr100_suspend(struct usb_interface *intf, pm_message_t message)
                  * we set status equal to STARTED.
                  * On resume we will check status and run radio if needed.
                  */
-
-                mutex_lock(&radio->lock);
                 radio->status = STARTED;
-                mutex_unlock(&radio->lock);
         }
+        mutex_unlock(&radio->v4l2_lock);
 
         dev_info(&intf->dev, "going into suspend..\n");
 
@@ -581,11 +562,13 @@ static int usb_dsbr100_resume(struct usb_interface *intf)
         struct dsbr100_device *radio = usb_get_intfdata(intf);
         int retval;
 
+        mutex_lock(&radio->v4l2_lock);
         if (radio->status == STARTED) {
                 retval = dsbr100_start(radio);
                 if (retval < 0)
                         dev_warn(&intf->dev, "dsbr100_start failed\n");
         }
+        mutex_unlock(&radio->v4l2_lock);
 
         dev_info(&intf->dev, "coming out of suspend..\n");
 
@@ -605,7 +588,7 @@ static void usb_dsbr100_video_device_release(struct video_device *videodev)
 /* File system interface */
 static const struct v4l2_file_operations usb_dsbr100_fops = {
         .owner          = THIS_MODULE,
-        .ioctl          = video_ioctl2,
+        .unlocked_ioctl = video_ioctl2,
 };
 
 static const struct v4l2_ioctl_ops usb_dsbr100_ioctl_ops = {
@@ -653,13 +636,13 @@ static int usb_dsbr100_probe(struct usb_interface *intf,
                 return retval;
         }
 
+        mutex_init(&radio->v4l2_lock);
         strlcpy(radio->videodev.name, v4l2_dev->name, sizeof(radio->videodev.name));
         radio->videodev.v4l2_dev = v4l2_dev;
         radio->videodev.fops = &usb_dsbr100_fops;
         radio->videodev.ioctl_ops = &usb_dsbr100_ioctl_ops;
         radio->videodev.release = usb_dsbr100_video_device_release;
-
-        mutex_init(&radio->lock);
+        radio->videodev.lock = &radio->v4l2_lock;
 
         radio->removed = 0;
         radio->usbdev = interface_to_usbdev(intf);