linux-kernel - Re: [PATCH 1/3] amdkfd: Don't clear *kfd2kgd on kfd_module

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Message-ID: <5496AB2F.9050804@amd.com>
Date:	Sun, 21 Dec 2014 13:12:47 +0200
From:	Oded Gabbay <oded.gabbay@....com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	<dri-devel@...ts.freedesktop.org>, David Airlie <airlied@...ux.ie>,
	Jerome Glisse <j.glisse@...il.com>,
	Joerg Roedel <joro@...tes.org>, <linux-kernel@...r.kernel.org>,
	John Bridgman <John.Bridgman@....com>,
	<Alexander.Deucher@....com>
Subject: Re: [PATCH 1/3] amdkfd: Don't clear *kfd2kgd on kfd_module_init



On 12/20/2014 11:25 PM, Greg KH wrote:
> On Sat, Dec 20, 2014 at 10:46:12PM +0200, Oded Gabbay wrote:
>> When amdkfd and radeon are compiled inside the kernel image (not as modules),
>> radeon will load before amdkfd and will set *kfd2kgd to its interface
>> structure. Therefore, we must not set *kfd2kgd to NULL when amdkfd is loaded
>> because it will override radeon's initialization and cause kernel BUG.
>>
>> Signed-off-by: Oded Gabbay <oded.gabbay@....com>
>> ---
>>   drivers/gpu/drm/amd/amdkfd/kfd_module.c | 5 ++---
>>   1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_module.c b/drivers/gpu/drm/amd/amdkfd/kfd_module.c
>> index 95d5af1..236562f 100644
>> --- a/drivers/gpu/drm/amd/amdkfd/kfd_module.c
>> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_module.c
>> @@ -34,7 +34,7 @@
>>   #define KFD_DRIVER_MINOR	7
>>   #define KFD_DRIVER_PATCHLEVEL	0
>>
>> -const struct kfd2kgd_calls *kfd2kgd;
>> +const struct kfd2kgd_calls *kfd2kgd = NULL;
>
> This change does nothing, that is what the original code did already.
>
> thanks,
>
> greg k-h
Yeah. Sorry, I will remove it.
	
	Oded
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