Patch "scsi: sd: Fix wrong DPOFUA disable in sd_read_cache_type" 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

scsi: sd: Fix wrong DPOFUA disable in sd_read_cache_type

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:
scsi-sd-fix-wrong-dpofua-disable-in-sd_read_cache_type.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: Damien Le Moal <[email protected]>
Date: Thu, 12 Jan 2017 15:25:10 +0900
Subject: scsi: sd: Fix wrong DPOFUA disable in sd_read_cache_type

From: Damien Le Moal <[email protected]>

[ Upstream commit 26f2819772af891dee2843e1f8662c58e5129d5f ]

Zoned block devices force the use of READ/WRITE(16) commands by setting sdkp->use_16_for_rw and clearing sdkp->use_10_for_rw. This result in DPOFUA always being disabled for these drives as the assumed use of the deprecated READ/WRITE(6) commands only looks at sdkp->use_10_for_rw. Strenghten the test by also checking that sdkp->use_16_for_rw is false.

---
 drivers/scsi/sd.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

@@ -2572,7 +2572,8 @@ sd_read_cache_type(struct scsi_disk *sdk
 		if (sdp->broken_fua) {
 			sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
 			sdkp->DPOFUA = 0;
-		} else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
+		} else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
+			   !sdkp->device->use_16_for_rw) {
 			sd_first_printk(KERN_NOTICE, sdkp,
 				  "Uses READ/WRITE(6), disabling FUA\n");
 			sdkp->DPOFUA = 0;

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

queue-4.9/scsi-sd-fix-wrong-dpofua-disable-in-sd_read_cache_type.patch