[PATCH] autofs: don't stuck in a loop if vfs_write returns an error

[Ian Kent]

From: Andrey Vagin <ava...@openvz.org>

__vfs_write() returns a negative value in a error case.

Signed-off-by: Andrey Vagin <ava...@openvz.org>
Signed-off-by: Ian Kent <ra...@themaw.net>
---
 fs/autofs4/waitq.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 0146d91..631f155 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -66,11 +66,12 @@ static int autofs4_write(struct autofs_sb_info *sbi,
        set_fs(KERNEL_DS);
 
        mutex_lock(&sbi->pipe_mutex);
-       wr = __vfs_write(file, data, bytes, &file->f_pos);
-       while (bytes && wr) {
+       while (bytes) {
+               wr = __vfs_write(file, data, bytes, &file->f_pos);
+               if (wr <= 0)
+                       break;
                data += wr;
                bytes -= wr;
-               wr = __vfs_write(file, data, bytes, &file->f_pos);
        }
        mutex_unlock(&sbi->pipe_mutex);