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Subject: Re: RfC: Handle SPI controller limitations like maximum message length
To: Mark Brown <broonie@kernel.org>
References: <564CEB61.2000601@gmail.com> <20151120000226.GP64635@google.com>
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Cc: Brian Norris <computersforpeace@gmail.com>, linux-mtd@lists.infradead.org,
 "linux-spi@vger.kernel.org" <linux-spi@vger.kernel.org>,
 Michal Suchanek <hramrach@gmail.com>, martin@sperl.org
From: Heiner Kallweit <hkallweit1@gmail.com>
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Date: Fri, 20 Nov 2015 20:37:23 +0100
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Am 20.11.2015 um 20:18 schrieb Mark Brown:
> On Fri, Nov 20, 2015 at 07:59:37PM +0100, Heiner Kallweit wrote:
> 
>> OK, I interpret this as:
>> Controller drivers shall return 0 only if the complete message was
>> transferred successfully.
> 
> Yes.
> 
>> If  a controller driver returns an error it has the option to set
>> actual_length to what was transferred successfully.
> 
> It should always do this.
> 
>> This means we can't use patch 4 from Michal because it bails out as soon
>> as the underlying SPI transfer returns an error.
> 
> I haven't seen that patch.
> 
Sorry, this was addressed to Brian. It's about a mtd spi-nor patch.
http://lists.infradead.org/pipermail/linux-mtd/2015-August/061062.html
Most likely neither you nor linux-spi was on cc.
(Oh, it was patch 7 of the series, not 4.)