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authorAlexey Khoroshilov <khoroshilov@ispras.ru>2014-09-02 11:40:17 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2014-09-07 21:26:39 +0400
commit9ef7db7f38d0472dd9c444e42d5c5175ccbe5451 (patch)
tree38098751b8e07a868788fda862f96763b55d0763 /fs/ufs/inode.c
parent81b6b06197606b4bef4e427a197aeb808e8d89e1 (diff)
downloadlinux-9ef7db7f38d0472dd9c444e42d5c5175ccbe5451.tar.xz
ufs: fix deadlocks introduced by sb mutex merge
Commit 0244756edc4b ("ufs: sb mutex merge + mutex_destroy") introduces deadlocks in ufs_new_inode() and ufs_free_inode(). Most callers of that functions acqure the mutex by themselves and ufs_{new,free}_inode() do that via lock_ufs(), i.e we have an unavoidable double lock. The patch proposes to resolve the issue by making sure that ufs_{new,free}_inode() are not called with the mutex held. Found by Linux Driver Verification project (linuxtesting.org). Cc: stable@vger.kernel.org # 3.16 Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ufs/inode.c')
-rw-r--r--fs/ufs/inode.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index 7c580c97990e..be7d42c7d938 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -902,9 +902,6 @@ void ufs_evict_inode(struct inode * inode)
invalidate_inode_buffers(inode);
clear_inode(inode);
- if (want_delete) {
- lock_ufs(inode->i_sb);
- ufs_free_inode (inode);
- unlock_ufs(inode->i_sb);
- }
+ if (want_delete)
+ ufs_free_inode(inode);
}