Patch "dm raid: fix discard support regression" has been added to the 4.9-stable tree

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

dm raid: fix discard support regression

to the 4.9-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:
dm-raid-fix-discard-support-regression.patch
and it can be found in the queue-4.9 subdirectory.

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

From: Heinz Mauelshagen <[email protected]>
Date: Tue, 29 Nov 2016 22:37:30 +0100
Subject: dm raid: fix discard support regression

From: Heinz Mauelshagen <[email protected]>

commit 11e2968478edc07a75ee1efb45011b3033c621c2 upstream.

Commit ecbfb9f118 ("dm raid: add raid level takeover support") moved the configure_discard_support() call from raid_ctr() to raid_preresume().

Enabling/disabling discard _must_ happen during table load (through the .ctr hook). Fix this regression by moving the configure_discard_support() call back to raid_ctr().

---
 drivers/md/dm-raid.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

@@ -2994,6 +2994,9 @@ static int raid_ctr(struct dm_target *ti
 		}
 	}
 
+	/* Disable/enable discard support on raid set. */
+	configure_discard_support(rs);
+
 	mddev_unlock(&rs->md);
 	return 0;
 

@@ -3580,12 +3583,6 @@ static int raid_preresume(struct dm_targ
 	if (test_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags))
 		rs_update_sbs(rs);
 
-	/*
-	 * Disable/enable discard support on raid set after any
-	 * conversion, because devices can have been added
-	 */
-	configure_discard_support(rs);
-
 	/* Load the bitmap from disk unless raid0 */
 	r = __load_dirty_region_bitmap(rs);
 	if (r)

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

queue-4.9/dm-raid-fix-discard-support-regression.patch