[media] em28xx: refactor the code in em28xx_usb_disconnect()

The main purpose of this patch is to move the call of em28xx_release_resources()
after the call of em28xx_close_extension().
This is necessary, because some resources might be needed/used by the extensions
fini() functions when they get closed.
Also mark the device as disconnected earlier in this function and unify the
em28xx_uninit_usb_xfer() calls for analog and digital mode.

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c
index 99f2da6..4d849bf 100644 (file)
--- a/drivers/media/usb/em28xx/em28xx-cards.c
+++ b/drivers/media/usb/em28xx/em28xx-cards.c
@@ -3507,6 +3507,8 @@ static void em28xx_usb_disconnect(struct usb_interface *interface)
        if (!dev)
                return;
 
+       dev->disconnected = 1;
+
        if (dev->is_audio_only) {
                mutex_lock(&dev->lock);
                em28xx_close_extension(dev);
@@ -3518,32 +3520,26 @@ static void em28xx_usb_disconnect(struct usb_interface *interface)
 
        flush_request_modules(dev);
 
-       /* wait until all current v4l2 io is finished then deallocate
-          resources */
        mutex_lock(&dev->lock);
 
        v4l2_device_disconnect(&dev->v4l2_dev);
 
        if (dev->users) {
-               em28xx_warn
-                   ("device %s is open! Deregistration and memory "
-                    "deallocation are deferred on close.\n",
-                    video_device_node_name(dev->vdev));
+               em28xx_warn("device %s is open! Deregistration and memory deallocation are deferred on close.\n",
+                           video_device_node_name(dev->vdev));
 
-               em28xx_uninit_usb_xfer(dev, dev->mode);
-               dev->disconnected = 1;
-       } else {
-               dev->disconnected = 1;
-               em28xx_release_resources(dev);
+               em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
+               em28xx_uninit_usb_xfer(dev, EM28XX_DIGITAL_MODE);
        }
 
-       /* free DVB isoc buffers */
-       em28xx_uninit_usb_xfer(dev, EM28XX_DIGITAL_MODE);
+       em28xx_close_extension(dev);
+       /* NOTE: must be called BEFORE the resources are released */
+
+       if (!dev->users)
+               em28xx_release_resources(dev);
 
        mutex_unlock(&dev->lock);
 
-       em28xx_close_extension(dev);
-
        if (!dev->users) {
                kfree(dev->alt_max_pkt_size_isoc);
                kfree(dev);