summaryrefslogtreecommitdiffstats
path: root/drivers/md/md.c
diff options
context:
space:
mode:
authorNeilBrown <neilb@suse.com>2017-10-05 16:23:16 +1100
committerShaohua Li <shli@fb.com>2017-10-05 10:09:22 -0700
commitd47c8ad261f787af22a220ffcc2d07afba809223 (patch)
tree4f943cc91af125c4326526b88b9240a9adc00dae /drivers/md/md.c
parent9e66317d3c92ddaab330c125dfe9d06eee268aff (diff)
downloadlinux-d47c8ad261f787af22a220ffcc2d07afba809223.tar.bz2
md: fix deadlock error in recent patch.
A recent patch aimed to cause md_write_start() to fail (rather than block) when the mddev was suspending, so as to avoid deadlocks. Unfortunately the test in wait_event() was wrong, and it didn't change behaviour at all. We wait_event() must wait until the metadata is written OR the array is suspending. Fixes: cc27b0c78c79 ("md: fix deadlock between mddev_suspend() and md_write_start()") Cc: stable@vger.kernel.org Reported-by: Xiao Ni <xni@redhat.com> Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/md.c')
-rw-r--r--drivers/md/md.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0ff1bbf6c90e..8b2eb0f4122f 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8039,7 +8039,8 @@ bool md_write_start(struct mddev *mddev, struct bio *bi)
if (did_change)
sysfs_notify_dirent_safe(mddev->sysfs_state);
wait_event(mddev->sb_wait,
- !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) && !mddev->suspended);
+ !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) ||
+ mddev->suspended);
if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) {
percpu_ref_put(&mddev->writes_pending);
return false;