I don't know
The patch is from me, I just think the patch is dropping a vm update which looks not perfect to me
-----邮件原件-----
发件人: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> 代表 Nirmoy
发送时间: 2020年2月20日 23:21
收件人: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
主题: Re: 回复: [PATCH] drm/amdgpu: fix a bug NULL pointer dereference
Hi Monk,
How can I reproduce this bug ?
Regards,
Nirmoy
On 2/20/20 4:15 PM, Nirmoy wrote:
>
> On 2/20/20 2:35 PM, Liu, Monk wrote:
>> Sorry, my previous idea still leave RQ null, please check if below
>> method works:
>>
>> 29 static struct drm_sched_rq *
>> 130 drm_sched_entity_get_free_sched(struct drm_sched_entity *entity)
>> 131 {
>> 132 struct drm_sched_rq *rq = NULL;
>> 133 unsigned int min_jobs = UINT_MAX, num_jobs;
>> 134 int i;
>>
>> 135
>> While (!mutex_trylock(....))
>> Sleep()
> We can't do that drm_sched_entity_get_free_sched is in another
> module(drm scheduler) independent of amdgpu
>> 136 for (i = 0; i < entity->num_rq_list; ++i) {
>> 137 struct drm_gpu_scheduler *sched =
>> entity->rq_list[i]->sched;
>> 138
>> 139 if (!entity->rq_list[i]->sched->ready) { //we take the
>> gpu reset mutex lock, so now sched->ready won't be set to "not ready"
>> 140 DRM_WARN("sched%s is not ready, skipping",
>> sched->name);
>> 141 continue;
>> 142 }
>> 143
>> 144 num_jobs = atomic_read(&sched->num_jobs);
>> 145 if (num_jobs < min_jobs) {
>> 146 min_jobs = num_jobs;
>> 147 rq = entity->rq_list[i];
>> 148 }
>> 149 }
>>
>> Mutex_unlock(...)
>>
>> 150
>> 151 return rq;
>> 152 }
>>
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