linux-kernel - RE: [PATCH 1/3] staging: comedi: amplc_dio200_common: prevent extra free

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Message-ID: <DC148C5AA1CEBA4E87973D432B1C2D8825F21646@P3PWEX4MB008.ex4.secureserver.net>
Date:	Mon, 28 Jul 2014 16:35:00 +0000
From:	Hartley Sweeten <HartleyS@...ionengravers.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Ian Abbott <abbotti@....co.uk>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/3] staging: comedi: amplc_dio200_common: prevent extra
 free_irq()

On Sunday, July 27, 2014 11:45 AM, Greg Kroah-Hartman wrote:
> On Fri, Jul 25, 2014 at 06:23:10PM +0000, Hartley Sweeten wrote:
>> On Friday, July 25, 2014 10:07 AM, Ian Abbott wrote:
>>> `dio200_detach()` in "amplc_dio200.c" calls
>>> `amplc_dio200_common_detach()` in "amplc_dio200_common.c", followed by
>>> `comedi_legacy_detach()` in "../drivers.c".  Both of those functions
>>> call `free_irq()` if `dev->irq` is non-zero.  The second call produces a
>>> warning message because the handler has already been freed.  Prevent
>>> that by setting `dev->irq = 0` in `amplc_dio200_common_detach()`.
>>>
>>> Signed-off-by: Ian Abbott <abbotti@....co.uk>
>>>
>> I have already gave a Reviewed-by signoff for this series.
>> 
>> After looking over the code I think a cleaner solution would be to:
>> 
>> 1) Use comedi_legacy_detach() directly for the (*detach) in the
>>    legacy ISA driver.
>> 2) Move the code from amplc_dio200_common_detach() into the
>>    (*detach) function for the PCI driver.
>> 3) Remove the exported function amplc_dio200_common_detach().
>
> So should I not apply these patches?

Greg,

Yes, please apply this series from Ian. It does fix a bug with the
duplicate free_irq().

The comments I gave can be addressed in a later patch.

Sorry for the confusion.
Hartley
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