linux-kernel - Re: Linux 2.6.28-rc5

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Date:	Sun, 16 Nov 2008 18:50:23 +0100
From:	Bruno Prémont <bonbons@...ux-vserver.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Kay Sievers <kay.sievers@...y.org>,
	Len Brown <len.brown@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: Linux 2.6.28-rc5

On Sun, 16 November 2008 Linus Torvalds wrote:
> On Sun, 16 Nov 2008, Bruno Prémont wrote:
> > 
> > The following change is guilty on my machine (though I could not
> > find the matching commit on git.kernel.org :( )
> 
> It's commit 0794469da3f7b2093575cbdfc1108308dd3641ce: "ACPI: struct
> device 
> - replace bus_id with dev_name(), dev_set_name()", and yes, it seems 
> totally buggy. It replaced a test for "dev->bus" with
> "dev_name(dev)", which makes no sense.

Looks like the reason I couldn't find it was old cache on
git.kernel.org or something like that as the matching commit
now shows up.

> > Reverting the change below makes the error go away.
> 
> Does this smaller patch just make it go away?
Yes, that smaller patch fixes it as well

> That said, that whole function looks potentially buggy. Len - why is
> it safe to do "list_for_each_safe()" when you drop the
> acpi_device_lock in the middle? The "next" pointer that we look up
> may go away while the lock is dropped, I think.
> 
> 		Linus
> 
> ---
>  drivers/acpi/sleep/proc.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/acpi/sleep/proc.c b/drivers/acpi/sleep/proc.c
> index 64e591b..4dbc227 100644
> --- a/drivers/acpi/sleep/proc.c
> +++ b/drivers/acpi/sleep/proc.c
> @@ -366,7 +366,7 @@ acpi_system_wakeup_device_seq_show(struct
> seq_file *seq, void *offset) dev->wakeup.state.enabled ? "enabled" :
> "disabled"); if (ldev)
>  			seq_printf(seq, "%s:%s",
> -				   dev_name(ldev) ?
> ldev->bus->name : "no-bus",
> +				   ldev->bus ? ldev->bus->name :
> "no-bus", dev_name(ldev));
>  		seq_printf(seq, "\n");
>  		put_device(ldev);
> 
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