From mboxrd@z Thu Jan  1 00:00:00 1970
From: xiaolei li <xiaolei.li-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
Subject: Re: [PATCH 1/2] libmtd: Add support to access OOB available size
Date: Mon, 9 Apr 2018 15:25:39 +0800
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To: David Oberhollenzer <david.oberhollenzer-S6VGOU4v5edDinCvNWH78Q@public.gmane.org>
Cc: boris.brezillon-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org, linux-mediatek-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, srv_heupstream-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org
List-Id: linux-mediatek@lists.infradead.org

Hi David,

On Mon, 2018-04-09 at 08:58 +0200, David Oberhollenzer wrote:
> Hi,
> 
> On 04/09/2018 05:10 AM, Xiaolei Li wrote:
> > @@ -769,6 +774,8 @@ int mtd_get_dev_info1(libmtd_t desc, int mtd_num, struct mtd_dev_info *mtd)
> >  		return -1;
> >  	if (dev_read_pos_int(lib->mtd_oob_size, mtd_num, &mtd->oob_size))
> >  		return -1;
> > +	if (dev_read_pos_int(lib->mtd_oobavail, mtd_num, &mtd->oobavail))
> > +		return -1;
> >  	if (dev_read_pos_int(lib->mtd_region_cnt, mtd_num, &mtd->region_cnt))
> >  		return -1;
> >  	if (dev_read_hex_int(lib->mtd_flags, mtd_num, &ret))
> 
> I'm not sure if it is a good idea to do a hard fail here, since this
> depends on a recent change to the kernel.
> 
> It might be preferable to catch and handle ENOENT, otherwise the next
> release of mtd-utils will only work on the next kernel release onward.
> 
Yes, it is. The hard fail return here seems not good.

> Maybe mtd_oobavail could to be set to some reasonable default that
> retains the current behaviour on "older" kernels?
> 
What about setting 0 as default?

Thanks,
Xiaolei
> 
> Thanks,
> 
> David