Re: [PATCH] libmtd: don't print an error message for devices without ecc support

[xiaolei li <xiaolei.li@mediatek.com>]

Hi David,

Thanks.

Reviewed-by: Xiaolei Li <xiaolei.li@mediatek.com>

On Wed, 2018-09-19 at 10:29 +0200, David Oberhollenzer wrote:
> The libmtd library tries to obtain the available OOB size via the sysfs
> with a fallback to the ECCGETLAYOUT ioctl. For some devices (e.g. plat-ram),
> the fallback path is always taken and prints an error message to stderr
> since the ioctl fails.
> 
> This patch fixes the fallback path by suppressing the error message if
> errno is set to EOPNOTSUPP (i.e. the device simply doesn't support that).
> 
> Fixes: a10353584f93 ("libmtd: Add support to access OOB available size")
> Reported-by: Chris Packham <Chris.Packham@alliedtelesis.co.nz>
> Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
> ---
>  lib/libmtd_legacy.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/lib/libmtd_legacy.c b/lib/libmtd_legacy.c
> index 97fef04..2b7f65f 100644
> --- a/lib/libmtd_legacy.c
> +++ b/lib/libmtd_legacy.c
> @@ -235,6 +235,8 @@ int legacy_get_mtd_oobavail(const char *node)
>  
>  	ret = ioctl(fd, ECCGETLAYOUT, &usrlay);
>  	if (ret < 0) {
> +		if (errno == EOPNOTSUPP)
> +			goto out_close;
>  		sys_errmsg("ECCGETLAYOUT ioctl request failed");
>  		goto out_close;
>  	}