[XFS] fix instant oops with tracing enabled

We can only read inode->i_count if the inode is actually there and not a
NULL pointer. This was introduced in one of the recent sync patches.

SGI-PV: 988255

SGI-Modid: xfs-linux-melb:xfs-kern:32315a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

diff --git a/fs/xfs/linux-2.6/xfs_vnode.c b/fs/xfs/linux-2.6/xfs_vnode.c
index dceb6db..ac827d2 100644 (file)
--- a/fs/xfs/linux-2.6/xfs_vnode.c
+++ b/fs/xfs/linux-2.6/xfs_vnode.c
@@ -92,7 +92,7 @@ static inline int xfs_icount(struct xfs_inode *ip)
 {
        struct inode *inode = VFS_I(ip);
 
-       if (!inode)
+       if (inode)
                return atomic_read(&inode->i_count);
        return -1;
 }