linux-kernel - [PATCH v3] nvdimm/btt: fix variable 'rc' set but not used

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Message-Id: <1572530719-32161-1-git-send-email-cai@lca.pw>
Date:   Thu, 31 Oct 2019 10:05:19 -0400
From:   Qian Cai <cai@....pw>
To:     dan.j.williams@...el.com
Cc:     vishal.l.verma@...el.com, dave.jiang@...el.com,
        keith.busch@...el.com, ira.weiny@...el.com,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org,
        Qian Cai <cai@....pw>
Subject: [PATCH v3] nvdimm/btt: fix variable 'rc' set but not used

drivers/nvdimm/btt.c: In function 'btt_read_pg':
drivers/nvdimm/btt.c:1264:8: warning: variable 'rc' set but not used
[-Wunused-but-set-variable]
    int rc;
        ^~

Add a ratelimited message in case a storm of errors is encountered.

Fixes: d9b83c756953 ("libnvdimm, btt: rework error clearing")
Signed-off-by: Qian Cai <cai@....pw>
---
v3: remove the unused "rc" per Vishal.
v2: include the block address that is returning an error per Dan.

 drivers/nvdimm/btt.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 3e9f45aec8d1..5129543a0473 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1261,11 +1261,11 @@ static int btt_read_pg(struct btt *btt, struct bio_integrity_payload *bip,
 
 		ret = btt_data_read(arena, page, off, postmap, cur_len);
 		if (ret) {
-			int rc;
-
 			/* Media error - set the e_flag */
-			rc = btt_map_write(arena, premap, postmap, 0, 1,
-				NVDIMM_IO_ATOMIC);
+			if (btt_map_write(arena, premap, postmap, 0, 1, NVDIMM_IO_ATOMIC))
+				dev_warn_ratelimited(to_dev(arena),
+					"Error persistently tracking bad blocks at %#x\n",
+					premap);
 			goto out_rtt;
 		}
 
-- 
1.8.3.1