2019-10-31 14:08:59

by Qian Cai

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 <[email protected]>
---
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

2019-10-31 21:39:59

by Verma, Vishal L

Subject: Re: [PATCH v3] nvdimm/btt: fix variable 'rc' set but not used

On Thu, 2019-10-31 at 10:05 -0400, Qian Cai wrote:
> 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 <[email protected]>
> ---
> 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(-)

Looks good,
Reviewed-by: Vishal Verma <[email protected]>

>
> 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;
> }
>