On Tue, 8 Oct 2024 at 18:01, Bartosz Golaszewski <brgl@xxxxxxxx> wrote:
>
> From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
>
> GCC 13 complains about the truncated output of snprintf():
>
> drivers/mmc/host/mmc_spi.c: In function ‘mmc_spi_response_get’:
> drivers/mmc/host/mmc_spi.c:227:64: error: ‘snprintf’ output may be truncated before the last format character [-Werror=format-truncation=]
> 227 | snprintf(tag, sizeof(tag), " ... CMD%d response SPI_%s",
> | ^
> drivers/mmc/host/mmc_spi.c:227:9: note: ‘snprintf’ output between 26 and 43 bytes into a destination of size 32
> 227 | snprintf(tag, sizeof(tag), " ... CMD%d response SPI_%s",
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 228 | cmd->opcode, maptype(cmd));
>
> Drop it and fold the string it generates into the only place where it's
> emitted - the dev_dbg() call at the end of the function.
>
> Fixes: 15a0580ced08 ("mmc_spi host driver")
> Suggested-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
Applied for next, thanks!
Kind regards
Uffe
> ---
> - instead of fixing the buffer size, just drop the snprintf() call
> altogether
>
> drivers/mmc/host/mmc_spi.c | 9 +++------
> 1 file changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
> index 8fee7052f2ef..47443fb5eb33 100644
> --- a/drivers/mmc/host/mmc_spi.c
> +++ b/drivers/mmc/host/mmc_spi.c
> @@ -222,10 +222,6 @@ static int mmc_spi_response_get(struct mmc_spi_host *host,
> u8 leftover = 0;
> unsigned short rotator;
> int i;
> - char tag[32];
> -
> - snprintf(tag, sizeof(tag), " ... CMD%d response SPI_%s",
> - cmd->opcode, maptype(cmd));
>
> /* Except for data block reads, the whole response will already
> * be stored in the scratch buffer. It's somewhere after the
> @@ -378,8 +374,9 @@ static int mmc_spi_response_get(struct mmc_spi_host *host,
> }
>
> if (value < 0)
> - dev_dbg(&host->spi->dev, "%s: resp %04x %08x\n",
> - tag, cmd->resp[0], cmd->resp[1]);
> + dev_dbg(&host->spi->dev,
> + " ... CMD%d response SPI_%s: resp %04x %08x\n",
> + cmd->opcode, maptype(cmd), cmd->resp[0], cmd->resp[1]);
>
> /* disable chipselect on errors and some success cases */
> if (value >= 0 && cs_on)
> --
> 2.43.0
>
