[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, 3 insertions, 0 deletions

diff --git a/fs/driverfs/inode.c b/fs/driverfs/inode.c
index 802d5f8597f9..e5c6de322190 100644
--- a/fs/driverfs/inode.c
+++ b/fs/driverfs/inode.c
@@ -32,6 +32,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/device.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 
@@ -341,6 +342,7 @@ driverfs_file_lseek(struct file *file, loff_t offset, int orig)
 {
 	loff_t retval = -EINVAL;
 
+	lock_kernel();
 	switch(orig) {
 	case 0:
 		if (offset > 0) {
@@ -357,6 +359,7 @@ driverfs_file_lseek(struct file *file, loff_t offset, int orig)
 	default:
 		break;
 	}
+	unlock_kernel();
 	return retval;
 }