linux-kernel - RE: [PATCH v5 3/4] drivers/i2c/busses/i2c-at91.c: add new driver

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Date:	Wed, 23 Nov 2011 11:28:47 +0100
From:	"Voss, Nikolaus" <N.Voss@...nmann.de>
To:	"'Carsten Behling'" <carsten.behling@...z-fricke.com>
CC:	"'linux-i2c@...r.kernel.org'" <linux-i2c@...r.kernel.org>,
	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v5 3/4] drivers/i2c/busses/i2c-at91.c: add new driver

Hi,

Carsten Behling wrote on 2011-11-23:

>> this case is already catched in at91_do_twi_transfer():
> 
> Sorry, I did not found this code in your patch.
> (http://www.mail-archive.com/linux-i2c@vger.kernel.org/msg06556.html):
> 
>> +       if (is_read) {
>> +               if (!dev->buf_len)

yes, this won't work for buf_len == 1. It is corrected in
https://lkml.org/lkml/2011/11/18/223 which I held back for some time
as it should have been just a feature extension. I was not aware it
also fixed the buf_len = 1 bug. Sorry for that...

(Explanation: in the first implementation I immediately decremented
buf_len, so buf_len == 1 could not occur. Later I removed that but
did not fully fold it into the base patch.)

Thanks,
Niko

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