linux-kernel - Re: [PATCH 1/1] watchdog: pcipcwd_show_card

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Date:   Sat, 5 Nov 2016 08:29:09 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Heinrich Schuchardt <xypron.glpk@....de>,
        Wim Van Sebroeck <wim@...ana.be>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] watchdog: pcipcwd_show_card_info: wrong format string

On 11/05/2016 07:50 AM, Heinrich Schuchardt wrote:
> fw_rev_major and fw_rev_minor are defined as int.
> Use %d to print them.
>
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
> ---
>  drivers/watchdog/pcwd_pci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/pcwd_pci.c b/drivers/watchdog/pcwd_pci.c
> index c0d07ee..e1fbbf6 100644
> --- a/drivers/watchdog/pcwd_pci.c
> +++ b/drivers/watchdog/pcwd_pci.c
> @@ -234,7 +234,7 @@ static void pcipcwd_show_card_info(void)
>  	got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major,
>  								&fw_rev_minor);
>  	if (got_fw_rev)
> -		sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
> +		sprintf(fw_ver_str, "%d.%02d", fw_rev_major, fw_rev_minor);
>  	else
>  		sprintf(fw_ver_str, "<card no answer>");
>
>
Hmm ... I don't think that a negative version number makes much sense.
Turns out inb() returns a char on some architectures, meaning it is signed,
meaning it _could_ return a negative number if the version number is 128
or above. I don't want to risk us reporting version number -128.-110 just
to make compilers happy.

Guenter