From: Alan Stern <stern@rowland.harvard.edu>
To: Hans de Goede <hdegoede@redhat.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
Miklos Szeredi <miklos@szeredi.hu>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Tejun Heo <tj@kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-pm@vger.kernel.org>
Subject: Re: [REGRESION] Suspend hangs with 3.6-rc1 on Lenovo T60 notebook
Date: Thu, 16 Aug 2012 11:13:33 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1208161106350.24305-100000@netrider.rowland.org> (raw)
In-Reply-To: <502CDADA.2070507@redhat.com>
On Thu, 16 Aug 2012, Hans de Goede wrote:
> Ah right, these are bus_driver operations. That explains some things, so I've
> done some more research asking myself: "Why does generic_ide_suspend(), which
> is a *bus* op, call dev_get_drvdata?", the answer to that seems to be that
> the ide subsystem is abusing (IMHO) drvdata to store per device bus_driver
> data. Which I believe is not how drvdata is intended to be used.
>
> With that said, the above knowledge has allowed me to write an (ugly) fix for
> the regression Miklos is seeing. Miklos can you give the attached patch a
> try please?
>
> > It clearly should check if drive is not NULL before using that pointer.
>
> I assume you mean drive*r*, yes I agree that generic_ide_remove should
> check for that. So who is going to write a patch for that?
The existing code could certainly be improved. Your patch does:
> + /*
> + * device_register() will have cleared drvdata on
> + * device_attach failure, but we use drvdata to store per
> + * device bus info, rather then for driver info, so restore it.
> + */
> + dev_set_drvdata(dev, drive);
But at this point, dev is defined by:
struct device *dev = &drive->gendev;
So why bother setting anything? It seems to me that
generic_ide_suspend() and generic_ide_resume() could easily replace
ide_drive_t *drive = dev_get_drvdata(dev);
with
ide_drive_t *drive = dev_to_ide_drive(dev);
where dev_to_ide_drive is defined as "container_of(dev, ide_drive_t,
gendev)" (if this isn't defined already).
Alan Stern
next prev parent reply other threads:[~2012-08-16 15:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <87a9xwivqb.fsf@tucsk.pomaz.szeredi.hu>
2012-08-15 6:41 ` [REGRESION] Suspend hangs with 3.6-rc1 on Lenovo T60 notebook Hans de Goede
2012-08-15 19:59 ` Rafael J. Wysocki
2012-08-16 11:34 ` Hans de Goede
2012-08-16 15:13 ` Alan Stern [this message]
2012-08-16 16:29 ` Miklos Szeredi
2012-08-16 16:32 ` Alan Stern
2012-08-16 20:02 ` Rafael J. Wysocki
2012-08-17 9:23 ` Hans de Goede
2012-08-17 14:22 ` Alan Stern
2012-08-17 14:27 ` Alan Stern
2012-08-17 15:32 ` Hans de Goede
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