From: Junxiao Bi <junxiao.bi@oracle.com>
To: linux-raid@vger.kernel.org
Cc: songliubraving@fb.com, linux-kernel@vger.kernel.org
Subject: [PATCH] md: get sysfs entry after redundancy attr group create
Date: Tue, 4 Aug 2020 17:27:18 -0700 [thread overview]
Message-ID: <20200805002718.50839-1-junxiao.bi@oracle.com> (raw)
"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: e1a86dbbbd6a ("md: fix deadlock causing by sysfs_notify")
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
---
drivers/md/md.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index fee8943ead7b..60d2142c4693 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -846,7 +846,13 @@ 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;
@@ -4036,6 +4042,8 @@ 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) {
@@ -5542,14 +5550,9 @@ 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)
@@ -5710,8 +5713,6 @@ 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);
@@ -5991,6 +5992,8 @@ 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;
--
2.20.1 (Apple Git-117)
next reply other threads:[~2020-08-05 0:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-05 0:27 Junxiao Bi [this message]
2020-08-06 0:05 ` [PATCH] md: get sysfs entry after redundancy attr group create Song Liu
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