RE: [PATCH 1/3] staging: comedi: amplc_dio200_common: prevent extra free_irq()

From: Hartley Sweeten
Date: Mon Jul 28 2014 - 12:35:10 EST

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@xxxxxxxxx>
>> 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?


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.
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