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autofs - Fix sparse warning: context imbalance in autofs4_d_automount() different lock contexts for basic block

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Sparse complains:

  fs/autofs4/root.c:409:9: sparse: context imbalance in 'autofs4_d_automount' - different lock contexts for basic block

This was introduced by commit f55fb0c243 ("autofs4 - dont clear
DCACHE_NEED_AUTOMOUNT on rootless mount")

The function autofs4_d_automount can be left with the (&sbi->fs_lock)
held if sbi->version <= 4 and simple_empty(dentry) == false so the
warning seems valid.

--> Add an spin_unlock in this case before we jump to done

Unfortunately compile tested only.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Acked-by: Ian Kent <raven@themaw.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peter Huewe 2013-03-01 19:46:40 +08:00 committed by Linus Torvalds
parent b0af9cd9aa
commit 9d8072e7c3
1 changed files with 3 additions and 1 deletions
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4
fs/autofs4/root.c
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@ -383,8 +383,10 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
goto done;
}
} else {
if (!simple_empty(dentry))
if (!simple_empty(dentry)) {
spin_unlock(&sbi->fs_lock);
goto done;
}
}
ino->flags |= AUTOFS_INF_PENDING;
spin_unlock(&sbi->fs_lock);