linux-kernel - Re: [REGRESION] Suspend hangs with 3.6-rc1 on Lenovo T60 notebook

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Date:	Fri, 17 Aug 2012 17:32:00 +0200
From:	Hans de Goede <hdegoede@...hat.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Miklos Szeredi <miklos@...redi.hu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: [REGRESION] Suspend hangs with 3.6-rc1 on Lenovo T60 notebook

Hi,

On 08/17/2012 04:27 PM, Alan Stern wrote:
> On Fri, 17 Aug 2012, Alan Stern wrote:
>
>> On Fri, 17 Aug 2012, Hans de Goede wrote:
>>
>>> No my patch was a hack to undo the results of the commit causing
>>> the regression in the IDE case. But Alan's approach clearly is
>>> much better! Once we are sure drvdata is not used anywhere the
>>> dev_set_drvdata call could be removed in the place where my
>>> hack added a second call to it. Note that there are likely
>>> actual ide drivers using it, without setting it themselves since
>>> the ide core was setting it. So removing it will require even more
>>> auditing / checking.
>>
>> I did search for dev_get_drvdata() calls in drivers/ide; there were no
>> other calls that retrieved an ide_drive_t value.  But I didn't check
>> anywhere else in the kernel.  In fact, I'm not sure where else to look.
>
> After a little more checking: Among all the .c files in the kernel
> which match the pattern '[^a-z]ide_', the only occurrences of
> dev_get_drvdata() which retrieve an ide_drive_t value are the two in
> ide-pm.c.

Thanks, good work! That means we should move forward with submitting
Miklos' patch to the ide subsystem maintainer asap.

Also if someone feels like it we still could do the 2 follow up / clean
up patches:

1) Removin the set_drvdata call from hwif_register_devices()
    in ide-prove.c
2) Fixup ide-generic.c ide_remove to not dereference a NULL dev->driver

Regards,

Hans
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