[PATCH] ubi: Only read necessary size when reading the VID header

[Sascha Hauer]

On Tue, Nov 22, 2016 at 04:21:21PM +0100, Ulrich Ölmann wrote:
> Based on kernel commit 8a8e8d2fdbab ("ubi: Only read necessary size when reading
> the VID header") by Sascha Hauer <s.hauer at pengutronix.de>:
> 
>     When reading the vid hdr from the device UBI always reads a whole
>     page. Instead, read only the data we actually need and speed up
>     attachment of UBI devices by potentially making use of reading
>     subpages if the NAND driver supports it.
> 
>     Since the VID header may be at offset vid_hdr_shift in the page and
>     we can only read from the beginning of a page we have to add that
>     offset to the read size.
> 
> Signed-off-by: Ulrich Ölmann <u.oelmann at pengutronix.de>

Applied, thanks

Sascha

> ---
>  drivers/mtd/ubi/io.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
> index 43af4a52dff9..6d08f92ea647 100644
> --- a/drivers/mtd/ubi/io.c
> +++ b/drivers/mtd/ubi/io.c
> @@ -711,7 +711,7 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
>  
>  	p = (char *)vid_hdr - ubi->vid_hdr_shift;
>  	read_err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset,
> -			  ubi->vid_hdr_alsize);
> +			  ubi->vid_hdr_shift + UBI_VID_HDR_SIZE);
>  	if (read_err && read_err != UBI_IO_BITFLIPS && !mtd_is_eccerr(read_err))
>  		return read_err;
>  
> -- 
> 2.10.2
> 
> 
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