+ loop-use-worker-per-cgroup-instead-of-kworker-fix.patch added to -mm tree

+ loop-use-worker-per-cgroup-instead-of-kworker-fix.patch added to -mm tree

[akpm]

The patch titled
     Subject: loop: fix IS_ERR() vs NULL bugs in loop_prepare_queue()
has been added to the -mm tree.  Its filename is
     loop-use-worker-per-cgroup-instead-of-kworker-fix.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/loop-use-worker-per-cgroup-instead-of-kworker-fix.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/loop-use-worker-per-cgroup-instead-of-kworker-fix.patch

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------------------------------------------------------
From: Dan Carpenter <dan.carpenter@oracle.com>
Subject: loop: fix IS_ERR() vs NULL bugs in loop_prepare_queue()

The alloc_workqueue() function returns NULL on error, it never returns
error pointers.

Link: http://lkml.kernel.org/r/20200228172136.h5dvwvrg5yfywxss@kili.mountain
Fixes: 29dab2122492 ("loop: use worker per cgroup instead of kworker")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Dan Schatzberg <schatzberg.dan@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/block/loop.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/block/loop.c~loop-use-worker-per-cgroup-instead-of-kworker-fix
+++ a/drivers/block/loop.c
@@ -901,7 +901,7 @@ static int loop_prepare_queue(struct loo
 					WQ_UNBOUND | WQ_FREEZABLE |
 					WQ_MEM_RECLAIM,
 					lo->lo_number);
-	if (IS_ERR(lo->workqueue))
+	if (!lo->workqueue)
 		return -ENOMEM;
 
 	return 0;
_

Patches currently in -mm which might be from dan.carpenter@oracle.com are

loop-use-worker-per-cgroup-instead-of-kworker-fix.patch