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OpenCloudOS-Kernel
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ubi: Fix race condition between ubi volume creation and udev 

Similar to commit 714fb87e8b ("ubi: Fix race condition between ubi
device creation and udev"), we should make the volume active before
registering it.

Signed-off-by: Clay McClure <clay@daemons.net>
Cc: <stable@vger.kernel.org>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Clay McClure 2017-09-21 19:01:34 -07:00 committed by Richard Weinberger
parent c0e860ba03
commit a51a0c8d21
1 changed files with 10 additions and 5 deletions
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15
drivers/mtd/ubi/vmt.c
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@ -270,6 +270,12 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
vol->last_eb_bytes = vol->usable_leb_size;
}
/* Make volume "available" before it becomes accessible via sysfs */
spin_lock(&ubi->volumes_lock);
ubi->volumes[vol_id] = vol;
ubi->vol_count += 1;
spin_unlock(&ubi->volumes_lock);
/* Register character device for the volume */
cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
vol->cdev.owner = THIS_MODULE;
@ -298,11 +304,6 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
if (err)
goto out_sysfs;
spin_lock(&ubi->volumes_lock);
ubi->volumes[vol_id] = vol;
ubi->vol_count += 1;
spin_unlock(&ubi->volumes_lock);
ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED);
self_check_volumes(ubi);
return err;
@ -315,6 +316,10 @@ out_sysfs:
*/
cdev_device_del(&vol->cdev, &vol->dev);
out_mapping:
spin_lock(&ubi->volumes_lock);
ubi->volumes[vol_id] = NULL;
ubi->vol_count -= 1;
spin_unlock(&ubi->volumes_lock);
ubi_eba_destroy_table(eba_tbl);
out_acc:
spin_lock(&ubi->volumes_lock);