From 6e7d80161066c99d12580d1b985cb1408bb58cf1 Mon Sep 17 00:00:00 2001
From: Richard Weinberger <richard@nod.at>
Date: Wed, 16 May 2018 22:17:03 +0200
Subject: [PATCH] ubi: fastmap: Cancel work upon detach
Git-commit: 6e7d80161066c99d12580d1b985cb1408bb58cf1
Patch-mainline: v4.18-rc1
References: bsc#1051510

Ben Hutchings pointed out that 29b7a6fa1ec0 ("ubi: fastmap: Don't flush
fastmap work on detach") does not really fix the problem, it just
reduces the risk to hit the race window where fastmap work races against
free()'ing ubi->volumes[].

The correct approach is making sure that no more fastmap work is in
progress before we free ubi data structures.
So we cancel fastmap work right after the ubi background thread is
stopped.
By setting ubi->thread_enabled to zero we make sure that no further work
tries to wake the thread.

Fixes: 29b7a6fa1ec0 ("ubi: fastmap: Don't flush fastmap work on detach")
Fixes: 74cdaf24004a ("UBI: Fastmap: Fix memory leaks while closing the WL sub-system")
Cc: stable@vger.kernel.org
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: Martin Townsend <mtownsend1973@gmail.com>

Signed-off-by: Richard Weinberger <richard@nod.at>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/mtd/ubi/build.c |    3 +++
 drivers/mtd/ubi/wl.c    |    4 +---
 2 files changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1080,6 +1080,9 @@ int ubi_detach_mtd_dev(int ubi_num, int
 	if (ubi->bgt_thread)
 		kthread_stop(ubi->bgt_thread);
 
+#ifdef CONFIG_MTD_UBI_FASTMAP
+	cancel_work_sync(&ubi->fm_work);
+#endif
 	ubi_debugfs_exit_dev(ubi);
 	uif_close(ubi);
 
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -1505,6 +1505,7 @@ int ubi_thread(void *u)
 	}
 
 	dbg_wl("background thread \"%s\" is killed", ubi->bgt_name);
+	ubi->thread_enabled = 0;
 	return 0;
 }
 
@@ -1514,9 +1515,6 @@ int ubi_thread(void *u)
  */
 static void shutdown_work(struct ubi_device *ubi)
 {
-#ifdef CONFIG_MTD_UBI_FASTMAP
-	flush_work(&ubi->fm_work);
-#endif
 	while (!list_empty(&ubi->works)) {
 		struct ubi_work *wrk;