[PATCH 2/4] radio-shark*: Call cancel_work_sync from disconnect rather then release

[Hans de Goede]

This removes the need for shark_led_work to take the v4l2 lock.

Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
 drivers/media/radio/radio-shark.c  | 13 ++-----------
 drivers/media/radio/radio-shark2.c | 12 ++----------
 2 files changed, 4 insertions(+), 21 deletions(-)

diff --git a/drivers/media/radio/radio-shark.c 
b/drivers/media/radio/radio-shark.c
index 6117132..05e12bf 100644
--- a/drivers/media/radio/radio-shark.c
+++ b/drivers/media/radio/radio-shark.c
@@ -181,14 +181,6 @@ static void shark_led_work(struct work_struct *work)
                container_of(work, struct shark_device, led_work);
        int i, res, brightness, actual_len;
 
-       /*
-        * We use the v4l2_dev lock and registered bit to ensure the device
-        * does not get unplugged and unreffed while we're running.
-        */
-       mutex_lock(&shark->tea.mutex);
-       if (!video_is_registered(&shark->tea.vd))
-               goto leave;
-
        for (i = 0; i < 3; i++) {
                if (!test_and_clear_bit(i, &shark->brightness_new))
                        continue;
@@ -208,8 +200,6 @@ static void shark_led_work(struct work_struct *work)
                        v4l2_err(&shark->v4l2_dev, "set LED %s error: %d\n",
                                 shark->led_names[i], res);
        }
-leave:
-       mutex_unlock(&shark->tea.mutex);
 }
 
 static void shark_led_set_blue(struct led_classdev *led_cdev,
@@ -259,6 +249,8 @@ static void usb_shark_disconnect(struct usb_interface *intf)
        for (i = 0; i < NO_LEDS; i++)
                led_classdev_unregister(&shark->leds[i]);
 
+       cancel_work_sync(&shark->led_work);
+
        v4l2_device_put(&shark->v4l2_dev);
 }
 
@@ -266,7 +258,6 @@ static void usb_shark_release(struct v4l2_device *v4l2_dev)
 {
        struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
 
-       cancel_work_sync(&shark->led_work);
        v4l2_device_unregister(&shark->v4l2_dev);
        kfree(shark->transfer_buffer);
        kfree(shark);
diff --git a/drivers/media/radio/radio-shark2.c 
b/drivers/media/radio/radio-shark2.c
index fc0289d..217483c 100644
--- a/drivers/media/radio/radio-shark2.c
+++ b/drivers/media/radio/radio-shark2.c
@@ -166,13 +166,6 @@ static void shark_led_work(struct work_struct *work)
        struct shark_device *shark =
                container_of(work, struct shark_device, led_work);
        int i, res, brightness, actual_len;
-       /*
-        * We use the v4l2_dev lock and registered bit to ensure the device
-        * does not get unplugged and unreffed while we're running.
-        */
-       mutex_lock(&shark->tea.mutex);
-       if (!video_is_registered(&shark->tea.vd))
-               goto leave;
 
        for (i = 0; i < 2; i++) {
                if (!test_and_clear_bit(i, &shark->brightness_new))
@@ -191,8 +184,6 @@ static void shark_led_work(struct work_struct *work)
                        v4l2_err(&shark->v4l2_dev, "set LED %s error: %d\n",
                                 shark->led_names[i], res);
        }
-leave:
-       mutex_unlock(&shark->tea.mutex);
 }
 
 static void shark_led_set_blue(struct led_classdev *led_cdev,
@@ -231,6 +222,8 @@ static void usb_shark_disconnect(struct usb_interface *intf)
        for (i = 0; i < NO_LEDS; i++)
                led_classdev_unregister(&shark->leds[i]);
 
+       cancel_work_sync(&shark->led_work);
+
        v4l2_device_put(&shark->v4l2_dev);
 }
 
@@ -238,7 +231,6 @@ static void usb_shark_release(struct v4l2_device *v4l2_dev)
 {
        struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
 
-       cancel_work_sync(&shark->led_work);
        v4l2_device_unregister(&shark->v4l2_dev);
        kfree(shark->transfer_buffer);
        kfree(shark);
-- 
1.7.11.4

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