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3 bug fixes for md in 3.13-rc

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All recent regressions, one in 3.12 so marked for -stable.
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Merge tag 'md/3.13-fixes' of git://neil.brown.name/md

Pull md fixes from Neil Brown:
 "Three bug fixes for md in 3.13-rc

  All recent regressions, one in 3.12 so marked for -stable"

* tag 'md/3.13-fixes' of git://neil.brown.name/md:
  md/raid5: fix newly-broken locking in get_active_stripe.
  md: test mddev->flags more safely in md_check_recovery.
  md/raid5: fix new memory-reference bug in alloc_thread_groups.
This commit is contained in:
Linus Torvalds 2013-11-28 09:51:39 -08:00
commit 962ba26326
2 changed files with 6 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/md/md.c
View File

@ -7777,7 +7777,7 @@ void md_check_recovery(struct mddev *mddev)
if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
return;
if ( ! (
(mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
(mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
(mddev->external == 0 && mddev->safemode == 1) ||

13
drivers/md/raid5.c
View File

@ -678,26 +678,23 @@ get_active_stripe(struct r5conf *conf, sector_t sector,
} else
init_stripe(sh, sector, previous);
} else {
spin_lock(&conf->device_lock);
if (atomic_read(&sh->count)) {
BUG_ON(!list_empty(&sh->lru)
&& !test_bit(STRIPE_EXPANDING, &sh->state)
&& !test_bit(STRIPE_ON_UNPLUG_LIST, &sh->state)
&& !test_bit(STRIPE_ON_RELEASE_LIST, &sh->state));
);
} else {
spin_lock(&conf->device_lock);
if (!test_bit(STRIPE_HANDLE, &sh->state))
atomic_inc(&conf->active_stripes);
if (list_empty(&sh->lru) &&
!test_bit(STRIPE_ON_RELEASE_LIST, &sh->state) &&
!test_bit(STRIPE_EXPANDING, &sh->state))
BUG();
BUG_ON(list_empty(&sh->lru));
list_del_init(&sh->lru);
if (sh->group) {
sh->group->stripes_cnt--;
sh->group = NULL;
}
spin_unlock(&conf->device_lock);
}
spin_unlock(&conf->device_lock);
}
} while (sh == NULL);
@ -5471,7 +5468,7 @@ static int alloc_thread_groups(struct r5conf *conf, int cnt,
for (i = 0; i < *group_cnt; i++) {
struct r5worker_group *group;
group = worker_groups[i];
group = &(*worker_groups)[i];
INIT_LIST_HEAD(&group->handle_list);
group->conf = conf;
group->workers = workers + i * cnt;