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md: get sysfs entry after redundancy attr group create 

"sync_completed" and "degraded" belongs to redundancy attr group,
it was not exist yet when md device was created.

Reported-by: kernel test robot <rong.a.chen@intel.com>
Fixes: e1a86dbbbd ("md: fix deadlock causing by sysfs_notify")
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
zero-sugar-mainline-defconfig
Junxiao Bi 2020-08-04 17:27:18 -07:00 committed by Song Liu
parent f59589fc89
commit e8efa9b88e
1 changed files with 10 additions and 7 deletions
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17
drivers/md/md.c
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@ -876,7 +876,13 @@ void mddev_unlock(struct mddev *mddev)
sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
if (mddev->sysfs_action)
sysfs_put(mddev->sysfs_action);
if (mddev->sysfs_completed)
sysfs_put(mddev->sysfs_completed);
if (mddev->sysfs_degraded)
sysfs_put(mddev->sysfs_degraded);
mddev->sysfs_action = NULL;
mddev->sysfs_completed = NULL;
mddev->sysfs_degraded = NULL;
}
}
mddev->sysfs_active = 0;
@ -4094,6 +4100,8 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
pr_warn("md: cannot register extra attributes for %s\n",
mdname(mddev));
mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
}
if (oldpers->sync_request != NULL &&
pers->sync_request == NULL) {
@ -5609,14 +5617,9 @@ static void md_free(struct kobject *ko)
if (mddev->sysfs_state)
sysfs_put(mddev->sysfs_state);
if (mddev->sysfs_completed)
sysfs_put(mddev->sysfs_completed);
if (mddev->sysfs_degraded)
sysfs_put(mddev->sysfs_degraded);
if (mddev->sysfs_level)
sysfs_put(mddev->sysfs_level);
if (mddev->gendisk)
del_gendisk(mddev->gendisk);
if (mddev->queue)
@ -5783,8 +5786,6 @@ static int md_alloc(dev_t dev, char *name)
if (!error && mddev->kobj.sd) {
kobject_uevent(&mddev->kobj, KOBJ_ADD);
mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
}
mddev_put(mddev);
@ -6064,6 +6065,8 @@ int md_run(struct mddev *mddev)
pr_warn("md: cannot register extra attributes for %s\n",
mdname(mddev));
mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
mddev->sysfs_completed = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_completed");
mddev->sysfs_degraded = sysfs_get_dirent_safe(mddev->kobj.sd, "degraded");
} else if (mddev->ro == 2) /* auto-readonly not meaningful */
mddev->ro = 0;