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From: Axel Lin <axel.lin-8E1dMatC8ynQT0dZR+AlfA@public.gmane.org>
To: Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>
Cc: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Wenyou Yang <wenyou.yang-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>,
	Fabrice Crohas <fcrohas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Illia Smyrnov
	<illia.smyrnov-hExfYMNmJl/Cnp4W7fqMDg@public.gmane.org>,
	Atsushi Nemoto <anemo-7JcRY8pycbNHfZP73Gtkiw@public.gmane.org>,
	Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>,
	linux-spi <linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH 1/7] spi: core: Validate Tx/Rx buffers for non-zero length transfer
Date: Wed, 19 Mar 2014 23:43:55 +0800	[thread overview]
Message-ID: <CAFRkauCUUOQ0xxa-k5_TMKUA7jnnz1FPjXnGT4T10v7upyOy8Q@mail.gmail.com> (raw)
In-Reply-To: <CAMuHMdWCdp_SW5CNt50cSfG700JRU3tr=Pbyhv8nv-1Ve=XUNw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

2014-03-19 16:06 GMT+08:00 Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>:
> On Wed, Mar 19, 2014 at 4:53 AM, Axel Lin <axel.lin-8E1dMatC8ynQT0dZR+AlfA@public.gmane.org> wrote:
>> Reject transfer if both tx_buf and rx_buf are NULL for non-zero length transfer.
>> Add the checking in spi core so we can remove the same checking in various
>> drivers.
>
> Just wondering: are there any SPI slave drivers that implement dummy cycles
> this way?

I think I found one such case:
drivers/net/wireless/libertas/if_spi.c
the dummy_trans has non-zero length, and both tx_buf and rx_buf are NULL.

But that means it doesn't work with master drivers with this checking, e.g.
all drivers using bitbang library has this checking.

Regards,
Axel
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  parent reply	other threads:[~2014-03-19 15:43 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-19  3:53 Axel Lin
2014-03-19  3:55 ` [PATCH 2/7] spi: atmel: Let spi core validate " Axel Lin
2014-03-19  4:01   ` Yang, Wenyou
2014-03-19  3:56 ` [PATCH 3/7] spi: omap-100k: " Axel Lin
2014-03-19  3:57 ` [PATCH 4/7] spi: omap2-mcspi: " Axel Lin
2014-03-19  3:58 ` [PATCH 5/7] spi: txx9: " Axel Lin
2014-03-19  3:59 ` [PATCH 6/7] spi: xcomm: " Axel Lin
2014-03-19  7:39   ` Lars-Peter Clausen
2014-03-19  4:00 ` [PATCH 7/7] spi: bitbang: " Axel Lin
2014-03-19  8:06 ` [PATCH 1/7] spi: core: Validate " Geert Uytterhoeven
     [not found]   ` <CAMuHMdWCdp_SW5CNt50cSfG700JRU3tr=Pbyhv8nv-1Ve=XUNw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-03-19 15:43     ` Axel Lin [this message]
     [not found]       ` <CAFRkauCUUOQ0xxa-k5_TMKUA7jnnz1FPjXnGT4T10v7upyOy8Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-03-19 16:08         ` Mark Brown
2014-08-16 14:34     ` Mark Brown

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