redhat-2.4.18-kernel-videodev.patch

来自「cpia usb摄像头的驱动程序源码。需要video4linux和i2c-cor」· PATCH 代码 · 共 30 行

diff -uNr linux-2.4.20/drivers/media/video/videodev.c linux-2.4.20-videodev_fix/drivers/media/video/videodev.c
--- linux-2.4.20/drivers/media/video/videodev.c	Sun Sep 29 19:31:52 2002
+++ linux-2.4.20-videodev_fix/drivers/media/video/videodev.c	Wed Jan  8 03:11:25 2003
@@ -186,14 +186,20 @@
 static int video_release(struct inode *inode, struct file *file)
 {
 	struct video_device *vfl;
+	struct module *owner;
 
-	down(&videodev_lock);
 	vfl = video_devdata(file);
-	if(vfl->close)
+	owner = vfl->owner;
+	if(vfl->close) 
 		vfl->close(vfl);
-	vfl->users--;
-	if(vfl->owner)
-		__MOD_DEC_USE_COUNT(vfl->owner);
+
+	down(&videodev_lock);
+	/* ->close() might have called video_device_unregister()
+	   in case of a hot unplug, thus we have to get vfl again */
+	if (vfl = video_devdata(file)) 
+		vfl->users--;
+	if (owner) 
+		__MOD_DEC_USE_COUNT(owner);
 	up(&videodev_lock);
 	return 0;
 }