Patch "ubi: Fix race condition between ubi device creation and udev" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

ubi: Fix race condition between ubi device creation and udev

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ubi-fix-race-condition-between-ubi-device-creation-and-udev.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Iosif Harutyunov <[email protected]>
Date: Fri, 22 Jul 2016 23:22:42 +0000
Subject: ubi: Fix race condition between ubi device creation and udev

From: Iosif Harutyunov <[email protected]>

commit 714fb87e8bc05ff78255afc0dca981e8c5242785 upstream.

Install the UBI device object before we arm sysfs. Otherwise udev tries to read sysfs attributes before UBI is ready and udev rules will not match.

---
 drivers/mtd/ubi/build.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

@@ -987,6 +987,9 @@ int ubi_attach_mtd_dev(struct mtd_info *
 			goto out_detach;
 	}
 
+	/* Make device "available" before it becomes accessible via sysfs */
+	ubi_devices[ubi_num] = ubi;
+
 	err = uif_init(ubi, &ref);
 	if (err)
 		goto out_detach;

@@ -1031,7 +1034,6 @@ int ubi_attach_mtd_dev(struct mtd_info *
 	wake_up_process(ubi->bgt_thread);
 	spin_unlock(&ubi->wl_lock);
 
-	ubi_devices[ubi_num] = ubi;
 	ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL);
 	return ubi_num;
 

@@ -1042,6 +1044,7 @@ out_uif:
 	ubi_assert(ref);
 	uif_close(ubi);
 out_detach:
+	ubi_devices[ubi_num] = NULL;
 	ubi_wl_close(ubi);
 	ubi_free_internal_volumes(ubi);
 	vfree(ubi->vtbl);

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/ubi-fix-race-condition-between-ubi-device-creation-and-udev.patch