[PATCH 23/28] drm: use new iterator in drm_gem_fence_array_add_implicit v3

[Christian König]

Am 13.10.21 um 16:21 schrieb Daniel Vetter:
> On Tue, Oct 05, 2021 at 01:37:37PM +0200, Christian König wrote:
>> Simplifying the code a bit.
>>
>> v2: add missing rcu_read_lock()/unlock()
>> v3: switch to locked version
>>
>> Signed-off-by: Christian König <christian.koenig at amd.com>
>> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Please make sure you also apply this to the new copy of this code in
> drm/sched. This one here is up for deletion, once I get all the driver
> conversions I have landed ...

Yeah, I do have that. Only added this patch here for completeness so 
that I could at least consider dropping the old access functions.

Put I will hold it back, just ping me when the code in question is removed.

Christian.

> -Daniel
>
>> ---
>>   drivers/gpu/drm/drm_gem.c | 26 +++++---------------------
>>   1 file changed, 5 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
>> index 09c820045859..4dcdec6487bb 100644
>> --- a/drivers/gpu/drm/drm_gem.c
>> +++ b/drivers/gpu/drm/drm_gem.c
>> @@ -1340,31 +1340,15 @@ int drm_gem_fence_array_add_implicit(struct xarray *fence_array,
>>   				     struct drm_gem_object *obj,
>>   				     bool write)
>>   {
>> -	int ret;
>> -	struct dma_fence **fences;
>> -	unsigned int i, fence_count;
>> -
>> -	if (!write) {
>> -		struct dma_fence *fence =
>> -			dma_resv_get_excl_unlocked(obj->resv);
>> -
>> -		return drm_gem_fence_array_add(fence_array, fence);
>> -	}
>> +	struct dma_resv_iter cursor;
>> +	struct dma_fence *fence;
>> +	int ret = 0;
>>   
>> -	ret = dma_resv_get_fences(obj->resv, NULL,
>> -						&fence_count, &fences);
>> -	if (ret || !fence_count)
>> -		return ret;
>> -
>> -	for (i = 0; i < fence_count; i++) {
>> -		ret = drm_gem_fence_array_add(fence_array, fences[i]);
>> +	dma_resv_for_each_fence(&cursor, obj->resv, write, fence) {
>> +		ret = drm_gem_fence_array_add(fence_array, fence);
>>   		if (ret)
>>   			break;
>>   	}
>> -
>> -	for (; i < fence_count; i++)
>> -		dma_fence_put(fences[i]);
>> -	kfree(fences);
>>   	return ret;
>>   }
>>   EXPORT_SYMBOL(drm_gem_fence_array_add_implicit);
>> -- 
>> 2.25.1
>>