linux-kernel - Re: [PATCH] amd64-agp: fix crash at second module load

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Date:	Wed, 23 Feb 2011 18:28:21 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Florian Mickler <florian@...kler.org>
Cc:	akpm@...ux-foundation.org, airlied@...ux.ie,
	randy.dunlap@...cle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] amd64-agp: fix crash at second module load

On Wed, Feb 23, 2011 at 6:26 PM, Florian Mickler <florian@...kler.org> wrote:
> Hi Andrew,
> I sent this to Dave Airlie because that is what MAINTAINERS says, but
> that is probably the wrong receipient?
>

No I just get agp blindspots, esp for the 64-bit ones since they
interact with x86.

I'll push it to Linus tomorrow.

Dave.

> Regards,
> Flo
>
> On Mon,  7 Feb 2011 23:29:31 +0100
> Florian Mickler <florian@...kler.org> wrote:
>
>> The module forgot to sometimes unregister some resources.
>>
>> This fixes Bug #22882.
>>
>> [Patch updated to 2.6.38-rc3 by Randy Dunlap.]
>> Tested-by: Randy Dunlap <randy.dunlap@...cle.com>
>> Signed-off-by: Florian Mickler <florian@...kler.org>
>> ---
>>  drivers/char/agp/amd64-agp.c |    9 +++++++--
>>  1 files changed, 7 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/char/agp/amd64-agp.c b/drivers/char/agp/amd64-agp.c
>> index 9252e85..780498d 100644
>> --- a/drivers/char/agp/amd64-agp.c
>> +++ b/drivers/char/agp/amd64-agp.c
>> @@ -773,18 +773,23 @@ int __init agp_amd64_init(void)
>>  #else
>>                       printk(KERN_INFO PFX "You can boot with agp=try_unsupported\n");
>>  #endif
>> +                     pci_unregister_driver(&agp_amd64_pci_driver);
>>                       return -ENODEV;
>>               }
>>
>>               /* First check that we have at least one AMD64 NB */
>> -             if (!pci_dev_present(amd_nb_misc_ids))
>> +             if (!pci_dev_present(amd_nb_misc_ids)) {
>> +                     pci_unregister_driver(&agp_amd64_pci_driver);
>>                       return -ENODEV;
>> +             }
>>
>>               /* Look for any AGP bridge */
>>               agp_amd64_pci_driver.id_table = agp_amd64_pci_promisc_table;
>>               err = driver_attach(&agp_amd64_pci_driver.driver);
>> -             if (err == 0 && agp_bridges_found == 0)
>> +             if (err == 0 && agp_bridges_found == 0) {
>> +                     pci_unregister_driver(&agp_amd64_pci_driver);
>>                       err = -ENODEV;
>> +             }
>>       }
>>       return err;
>>  }
> --
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