From 4fb3a53860cee2aaaf81186c451b7da0b95b45c1 Mon Sep 17 00:00:00 2001
From: Dipankar Sarma <dipankar@in.ibm.com>
Date: Fri, 16 Sep 2005 19:28:13 -0700
Subject: [PATCH] files: fix preemption issues

With the new fdtable locking rules, you have to protect fdtable with either
->file_lock or rcu_read_lock/unlock().  There are some places where we
aren't doing either.  This patch fixes those places.

Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 fs/locks.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'fs/locks.c')

diff --git a/fs/locks.c b/fs/locks.c
index c2c09b4798d..f7daa5f4894 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -124,6 +124,7 @@
 #include <linux/smp_lock.h>
 #include <linux/syscalls.h>
 #include <linux/time.h>
+#include <linux/rcupdate.h>
 
 #include <asm/semaphore.h>
 #include <asm/uaccess.h>
@@ -2205,6 +2206,7 @@ void steal_locks(fl_owner_t from)
 
 	lock_kernel();
 	j = 0;
+	rcu_read_lock();
 	fdt = files_fdtable(files);
 	for (;;) {
 		unsigned long set;
@@ -2222,6 +2224,7 @@ void steal_locks(fl_owner_t from)
 			set >>= 1;
 		}
 	}
+	rcu_read_unlock();
 	unlock_kernel();
 }
 EXPORT_SYMBOL(steal_locks);
-- 
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