[PATCH] 2.5.4-pre1: further llseek cleanup (3/3)

The previous patch did not provide protection for device lseek methods
(drivers/* stuff).  This patch pushes the BKL into each of the remaining
lseek methods -- without them we have a race.

I'd much prefer to have a a better lock to push down than the BKL, but
that will have to wait.

Before you balk at the size, remember patch #2 in this series which
removed much code ;-)

Thanks to Al for assistance, especially a listing of affected files.

	Robert Love

1 files changed, 12 insertions, 7 deletions

diff --git a/drivers/usb/devio.c b/drivers/usb/devio.c
index c7883b376139..342c049e24ca 100644
--- a/drivers/usb/devio.c
+++ b/drivers/usb/devio.c
@@ -58,21 +58,26 @@ struct async {
 
 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 {
+	loff_t ret;
+
+	lock_kernel();
+
 	switch (orig) {
 	case 0:
 		file->f_pos = offset;
-		return file->f_pos;
-
+		ret = file->f_pos;
+		break;
 	case 1:
 		file->f_pos += offset;
-		return file->f_pos;
-
+		ret = file->f_pos;
+		break;
 	case 2:
-		return -EINVAL;
-
 	default:
-		return -EINVAL;
+		ret = -EINVAL;
 	}
+
+	unlock_kernel();
+	return ret;
 }
 
 static ssize_t usbdev_read(struct file *file, char * buf, size_t nbytes, loff_t *ppos)