linux-kernel - Re: [PATCH] spi/pxa2xx: Clear cur_chip pointer before starting next message

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Message-ID: <87r3wex7t2.fsf@free.fr>
Date:	Fri, 05 Dec 2014 19:36:41 +0100
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	linux-spi@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Martin Oldfield <m@...ldfield.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi/pxa2xx: Clear cur_chip pointer before starting next message

Mika Westerberg <mika.westerberg@...ux.intel.com> writes:

> On Thu, Dec 04, 2014 at 10:01:06PM +0100, Robert Jarzmik wrote:
>> So with your change, we have :
>>   	drv_data->cur_chip = NULL;
>> 	spi_finalize_current_message(drv_data->master);
>> 
>> In that case, if spi_finalize_current_message() queues another message, upon
>> this next message completion, won't giveback() be called, and dereference
>> cur_chip as well ?
>
> When the next message is started pxa2xx_spi_transfer_one_message() gets
> called and that will set cur_chip again.

Acked-by: Robert Jarzmik <robert.jarzmik@...e.fr>

Cheers.

-- 
Robert
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