linux-kernel - Re: [rtc-linux] Re: [BUG 2.6.30_rc5] Null pointer dereference in rtc-cmos driver

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Date:	Sun, 17 May 2009 02:36:41 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alessandro Zummo <alessandro.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, mingo@...e.hu,
	Ozan Çağlayan <ozan@...dus.org.tr>,
	David Brownell <david-b@...bell.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>, Tejun Heo <tj@...nel.org>
Subject: Re: [rtc-linux] Re: [BUG 2.6.30_rc5] Null pointer dereference in 
	rtc-cmos driver

On Sun, May 17, 2009 at 01:36, Kay Sievers <kay.sievers@...y.org> wrote:
> On Sun, May 17, 2009 at 00:49, Andrew Morton <akpm@...ux-foundation.org> wrote:
>
>> This should fix the symptoms:
>
>> +++ a/drivers/rtc/rtc-cmos.c
>> @@ -1179,7 +1179,9 @@ static int __init cmos_init(void)
>>        int retval = 0;
>>
>>  #ifdef CONFIG_PNP
>> -       pnp_register_driver(&cmos_pnp_driver);
>> +       retval = pnp_register_driver(&cmos_pnp_driver);
>> +       if (retval < 0)
>> +               return retval;
>>  #endif
>
> That looks like a good fix.
>
>> Can someone please test it?
>
> I'll try to reproduce it.

Looks good. It makes the issue go away:
  Error: Driver 'rtc_cmos' is already registered, aborting...
  initcall cmos_init+0x0/0x55 [rtc_cmos] returned -17 after 51 usecs
  initcall cmos_init+0x0/0x55 [rtc_cmos] returned with error code -17

Now to the driver core fix to prevent that ...

Thanks,
Kay
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