linux-kernel - RE: [PATCH v4 7/7] mtd: spi-nor: add read loop

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Date:	Thu, 5 Nov 2015 03:39:18 +0000
From:	Hou Zhiqiang <B48286@...escale.com>
To:	Michal Suchanek <hramrach@...il.com>,
	Andrew Murray <amurray@...edded-bits.co.uk>
CC:	Huang Shijie <shijie.huang@...el.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Xu Han <han.xu@...escale.com>,
	Rafa? Mi?ecki <zajec5@...il.com>,
	Huang Shijie <b32955@...escale.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Marek Vasut <marex@...x.de>, Gabor Juhos <juhosg@...nwrt.org>,
	Bean Huo 霍斌斌, <beanhuo@...ron.com>,
	"MTD Maling List" <linux-mtd@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4 7/7] mtd: spi-nor: add read loop

Hi Michal,

Does this have any updates?

Thanks,
Zhiqiang

> -----Original Message-----
> From: Michal Suchanek [mailto:hramrach@...il.com]
> Sent: 2015年8月14日 18:08
> To: Andrew Murray
> Cc: Hou Zhiqiang-B48286; Huang Shijie; David Woodhouse; Brian Norris; Xu
> Han-B45815; Rafał Miłecki; Huang Shijie; Ben Hutchings; Marek Vasut;
> Gabor Juhos; Bean Huo 霍斌斌,; MTD Maling List; LKML
> Subject: Re: [PATCH v4 7/7] mtd: spi-nor: add read loop
> 
> On 14 August 2015 at 12:02, Andrew Murray <amurray@...edded-bits.co.uk>
> wrote:
> > On 14 August 2015 at 10:23, Michal Suchanek <hramrach@...il.com> wrote:
> >> mtdblock and ubi do not handle the situation when read returns less
> >> data than requested. Loop in spi-nor until buffer is filled or an
> >> error is returned.
> >>
> >> Signed-off-by: Michal Suchanek <hramrach@...il.com>
> >> ---
> >>  drivers/mtd/spi-nor/spi-nor.c | 20 ++++++++++++++------
> >>  1 file changed, 14 insertions(+), 6 deletions(-)
> >>
> >> diff --git a/drivers/mtd/spi-nor/spi-nor.c
> >> b/drivers/mtd/spi-nor/spi-nor.c index e0ae9cf..246fac7 100644
> >> --- a/drivers/mtd/spi-nor/spi-nor.c
> >> +++ b/drivers/mtd/spi-nor/spi-nor.c
> >> @@ -738,14 +738,22 @@ static int spi_nor_read(struct mtd_info *mtd,
> loff_t from, size_t len,
> >>         if (ret)
> >>                 return ret;
> >>
> >> -       ret = nor->read(nor, from, len, buf);
> >> +       while (len) {
> >> +               ret = nor->read(nor, from, len, buf);
> >> +               if (ret <= 0)
> >> +                       goto read_err;
> >> +
> >> +               BUG_ON(ret > len);
> >> +               *retlen += ret;
> >
> > Is *retlen initialized to 0 anywhere?
> 
> It's initialized in mtdcore and passed into mtd->_read.
> 
> Yes, the interface is really awkward.
> 
> int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t
> *retlen,
>              u_char *buf)
> {
>         int ret_code;
>         *retlen = 0;
> 
> 
> Thanks
> 
> Michal