linux-kernel - [PATCH] libnvdimm, btt: fix btt_rw

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Date:   Thu, 29 Jun 2017 16:59:11 -0600
From:   Vishal Verma <vishal.l.verma@...el.com>
To:     <linux-nvdimm@...ts.01.org>, <linux-kernel@...r.kernel.org>
Cc:     Vishal Verma <vishal.l.verma@...el.com>, stable@...r.kernel.org,
        Toshi Kani <toshi.kani@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jeff Moyer <jmoyer@...hat.com>
Subject: [PATCH] libnvdimm, btt: fix btt_rw_page not returning errors

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: 5212e11 nd_btt: atomic sector updates
Cc: <stable@...r.kernel.org>
Cc: Toshi Kani <toshi.kani@....com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Jeff Moyer <jmoyer@...hat.com>
Signed-off-by: Vishal Verma <vishal.l.verma@...el.com>
---
 drivers/nvdimm/btt.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 7ca11df..4e56e72 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1248,10 +1248,13 @@ static int btt_rw_page(struct block_device *bdev, sector_t sector,
 		struct page *page, bool is_write)
 {
 	struct btt *btt = bdev->bd_disk->private_data;
+	int rc;
 
-	btt_do_bvec(btt, NULL, page, PAGE_SIZE, 0, is_write, sector);
-	page_endio(page, is_write, 0);
-	return 0;
+	rc = btt_do_bvec(btt, NULL, page, PAGE_SIZE, 0, is_write, sector);
+	if (rc == 0)
+		page_endio(page, is_write, 0);
+
+	return rc;
 }
 
 
-- 
2.9.3