From 3e88c17d404c5787afd5bd1763380317f5ccbf84 Mon Sep 17 00:00:00 2001
From: Herbert Poetzl <herbert@13thfloor.at>
Date: Sun, 26 Mar 2006 01:37:30 -0800
Subject: [PATCH] loop: potential kernel hang waiting for kthread

Check that kernel_thread() succeeded, so we don't wait for something which
cannot happen.

Signed-off-by: Herbert Poetzl <herbert@13thfloor.at>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 74bf025..9c3b94e 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -839,7 +839,9 @@ static int loop_set_fd(struct loop_device *lo, struct file *lo_file,
 
 	set_blocksize(bdev, lo_blocksize);
 
-	kernel_thread(loop_thread, lo, CLONE_KERNEL);
+	error = kernel_thread(loop_thread, lo, CLONE_KERNEL);
+	if (error < 0)
+		goto out_putf;
 	wait_for_completion(&lo->lo_done);
 	return 0;
 
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