Patch "libnvdimm, btt: fix btt_rw_page not returning errors" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

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

    libnvdimm, btt: fix btt_rw_page not returning errors

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:
     libnvdimm-btt-fix-btt_rw_page-not-returning-errors.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 <stable@vger.kernel.org> know about it.


>From c13c43d54f2c6a3be1c675766778ac1ad8dfbfcc Mon Sep 17 00:00:00 2001
From: Vishal Verma <vishal.l.verma@intel.com>
Date: Thu, 29 Jun 2017 16:59:11 -0600
Subject: libnvdimm, btt: fix btt_rw_page not returning errors

From: Vishal Verma <vishal.l.verma@intel.com>

commit c13c43d54f2c6a3be1c675766778ac1ad8dfbfcc upstream.

btt_rw_page was not propagating errors frm btt_do_bvec, resulting in any
IO errors via the rw_page path going unnoticed. the pmem driver recently
fixed this in e10624f pmem: fail io-requests to known bad blocks
but same problem in BTT went neglected.

Fixes: 5212e11fde4d ("nd_btt: atomic sector updates")
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>


---
 drivers/nvdimm/btt.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1205,10 +1205,13 @@ static int btt_rw_page(struct block_devi
 		struct page *page, int rw)
 {
 	struct btt *btt = bdev->bd_disk->private_data;
+	int rc;
 
-	btt_do_bvec(btt, NULL, page, PAGE_CACHE_SIZE, 0, rw, sector);
-	page_endio(page, rw & WRITE, 0);
-	return 0;
+	rc = btt_do_bvec(btt, NULL, page, PAGE_CACHE_SIZE, 0, rw, sector);
+	if (rc == 0)
+		page_endio(page, rw & WRITE, 0);
+
+	return rc;
 }
 
 


Patches currently in stable-queue which might be from vishal.l.verma@intel.com are

queue-4.4/libnvdimm-btt-fix-btt_rw_page-not-returning-errors.patch