From 7ad1069166c0ccdd572d27e01cc7f7f84477df1e Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 1 Sep 2021 13:38:33 +0200 Subject: md: properly unwind when failing to add the kobject in md_alloc Add proper error handling to delete the gendisk when failing to add the md kobject and clean up the error unwinding in general. Signed-off-by: Christoph Hellwig Signed-off-by: Song Liu Signed-off-by: Jens Axboe --- drivers/md/md.c | 37 +++++++++++++++++-------------------- 1 file changed, 17 insertions(+), 20 deletions(-) (limited to 'drivers/md/md.c') diff --git a/drivers/md/md.c b/drivers/md/md.c index 946bbedf5dcf..c6b15ff0074f 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -5672,7 +5672,7 @@ static int md_alloc(dev_t dev, char *name) strcmp(mddev2->gendisk->disk_name, name) == 0) { spin_unlock(&all_mddevs_lock); error = -EEXIST; - goto abort; + goto out_unlock_disks_mutex; } spin_unlock(&all_mddevs_lock); } @@ -5685,7 +5685,7 @@ static int md_alloc(dev_t dev, char *name) error = -ENOMEM; disk = blk_alloc_disk(NUMA_NO_NODE); if (!disk) - goto abort; + goto out_unlock_disks_mutex; disk->major = MAJOR(mddev->unit); disk->first_minor = unit << shift; @@ -5710,26 +5710,23 @@ static int md_alloc(dev_t dev, char *name) disk->events |= DISK_EVENT_MEDIA_CHANGE; mddev->gendisk = disk; error = add_disk(disk); - if (error) { - blk_cleanup_disk(disk); - goto abort; - } + if (error) + goto out_cleanup_disk; error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md"); - if (error) { - /* This isn't possible, but as kobject_init_and_add is marked - * __must_check, we must do something with the result - */ - pr_debug("md: cannot register %s/md - name in use\n", - disk->disk_name); - error = 0; - } - abort: - 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_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level"); - } + if (error) + goto out_del_gendisk; + + kobject_uevent(&mddev->kobj, KOBJ_ADD); + mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); + mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level"); + goto out_unlock_disks_mutex; + +out_del_gendisk: + del_gendisk(disk); +out_cleanup_disk: + blk_cleanup_disk(disk); +out_unlock_disks_mutex: mutex_unlock(&disks_mutex); mddev_put(mddev); return error; -- cgit v1.2.3