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authorSergei Trofimovich <slyfox@gentoo.org>2014-04-07 11:55:46 +0400
committerChris Mason <clm@fb.com>2014-04-07 21:41:52 +0400
commit800ee2247f483b6d05ed47ef3bbc90b56451746c (patch)
tree3d68c155af1488fb53c8b38e6ed4c6734d6b246d /fs/btrfs/async-thread.c
parentc4a050bbbb5d7dab03aa720af36d8e91ed7f2ec8 (diff)
downloadlinux-800ee2247f483b6d05ed47ef3bbc90b56451746c.tar.xz
btrfs: fix crash in remount(thread_pool=) case
Reproducer: mount /dev/ubda /mnt mount -oremount,thread_pool=42 /mnt Gives a crash: ? btrfs_workqueue_set_max+0x0/0x70 btrfs_resize_thread_pool+0xe3/0xf0 ? sync_filesystem+0x0/0xc0 ? btrfs_resize_thread_pool+0x0/0xf0 btrfs_remount+0x1d2/0x570 ? kern_path+0x0/0x80 do_remount_sb+0xd9/0x1c0 do_mount+0x26a/0xbf0 ? kfree+0x0/0x1b0 SyS_mount+0xc4/0x110 It's a call btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, new_pool_size); with fs_info->scrub_wr_completion_workers = NULL; as scrub wqs get created only on user's demand. Patch skips not-created-yet workqueues. Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org> CC: Qu Wenruo <quwenruo@cn.fujitsu.com> CC: Chris Mason <clm@fb.com> CC: Josef Bacik <jbacik@fb.com> CC: linux-btrfs@vger.kernel.org Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/async-thread.c')
-rw-r--r--fs/btrfs/async-thread.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
index ecb5832c0967..5a201d81049c 100644
--- a/fs/btrfs/async-thread.c
+++ b/fs/btrfs/async-thread.c
@@ -323,6 +323,8 @@ void btrfs_destroy_workqueue(struct btrfs_workqueue *wq)
void btrfs_workqueue_set_max(struct btrfs_workqueue *wq, int max)
{
+ if (!wq)
+ return;
wq->normal->max_active = max;
if (wq->high)
wq->high->max_active = max;