Hi.
2018-04-19 22:53 GMT+09:00 Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>:
> Currently, the code block inside the for loop will never execute
> more than once, because the function returns inmediately after
> the first iteration, hence the execution of the code at the second
> iteration is structurally dead and, code at line 281: return 0; is
> never reached.
>
> Based on the code comments, it seems that the actual intention is
> to execute the code inside the for loop twice instead of once.
Thanks for the report.
> So, fix this issue by removing the return statement inside the for
> loop and replace the "return 0" with "return ret".
>
> Addresses-Coverity-ID: 1468009 ("Logically dead code")
> Addresses-Coverity-ID: 1468002 ("Structurally dead code")
> Fixes: 213fae74318b ("mmc: sdhci-cadence: send tune request twice to
> work around errata")
Probably, this Fixes tag will dangle.
Ulf usually repeats git-rebase to build-up his pull-request.
The addressed commit was already rebased,
and its commit ID will change a few more times
since it is now -rc1.
A clean solution would be, to squash a fix-up into the original patch.
(This patch is not what I want, though.)
If you want to claim contribution in a separate patch,
please rewrite the code as I suggested,
and drop the Fixes tag.
> Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-cadence.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
> index bc30d16..facbad8 100644
> --- a/drivers/mmc/host/sdhci-cadence.c
> +++ b/drivers/mmc/host/sdhci-cadence.c
> @@ -275,10 +275,9 @@ static int sdhci_cdns_set_tune_val(struct sdhci_host *host, unsigned int val)
> !(tmp & SDHCI_CDNS_HRS06_TUNE_UP),
> 0, 1);
>
> - return ret;
> }
>
> - return 0;
> + return ret;
> }
>
> static int sdhci_cdns_execute_tuning(struct mmc_host *mmc, u32 opcode)
> --
No.
I want to confirm that the operation succeeds twice.
Your code hides any error in the first loop.
My intention is like follows:
--- a/drivers/mmc/host/sdhci-cadence.c
+++ b/drivers/mmc/host/sdhci-cadence.c
@@ -275,10 +275,9 @@ static int sdhci_cdns_set_tune_val(struct
sdhci_host *host, unsigned int val)
!(tmp & SDHCI_CDNS_HRS06_TUNE_UP),
0, 1);
-
- return ret;
+ if (ret)
+ return ret;
}
return 0;
}
static int sdhci_cdns_execute_tuning(struct mmc_host *mmc, u32 opcode)
--
Best Regards
Masahiro Yamada
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