[patch] radio-mr800 - autosuspend for radio-mr800 driver

[Alexey Klimov]

From: Oliver Neukum <oli...@neukum.org>

Patch adds autosuspend support for mr800 radio driver.

Priority: normal

Signed-off-by: Oliver Neukum <oli...@neukum.org>
Acked-by: Alexey Klimov <klimov.li...@gmail.com>

--
diff -r 19c0469c02c3 linux/drivers/media/radio/radio-mr800.c
--- a/linux/drivers/media/radio/radio-mr800.c   Sat Nov 07 15:51:01 2009 -0200
+++ b/linux/drivers/media/radio/radio-mr800.c   Tue Nov 10 00:38:19 2009 +0300
@@ -133,6 +133,7 @@
 struct amradio_device {
        /* reference to USB and video device */
        struct usb_device *usbdev;
+       struct usb_interface *intf;
        struct video_device videodev;
        struct v4l2_device v4l2_dev;
 
@@ -166,7 +167,7 @@
        .reset_resume           = usb_amradio_resume,
 #endif
        .id_table               = usb_amradio_device_table,
-       .supports_autosuspend   = 0,
+       .supports_autosuspend   = 1,
 };
 
 /* switch on/off the radio. Send 8 bytes to device */
@@ -509,9 +510,15 @@
        }
 
        file->private_data = radio;
+       retval = usb_autopm_get_interface(radio->intf);
+       if (retval)
+               goto unlock;
 
-       if (unlikely(!radio->initialized))
+       if (unlikely(!radio->initialized)) {
                retval = usb_amradio_init(radio);
+               if (retval)
+                       usb_autopm_put_interface(radio->intf);
+       }
 
 unlock:
        mutex_unlock(&radio->lock);
@@ -528,6 +535,8 @@
 
        if (!radio->usbdev)
                retval = -EIO;
+       else
+               usb_autopm_put_interface(radio->intf);
 
        mutex_unlock(&radio->lock);
        return retval;
@@ -669,6 +678,7 @@
        radio->videodev.release = usb_amradio_video_device_release;
 
        radio->usbdev = interface_to_usbdev(intf);
+       radio->intf = intf;
        radio->curfreq = 95.16 * FREQ_MUL;
 
        mutex_init(&radio->lock);



-- 
Alexey Klimov
--
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