[bug report] drm/amdgpu: Workaround to skip kiq ring test during ras gpu recovery

[Dan Carpenter]

Hello Stanley.Yang,

The patch b1338a8e71ac: "drm/amdgpu: Workaround to skip kiq ring test
during ras gpu recovery" from Oct 17, 2023 (linux-next), leads to the
following Smatch static checker warning:

	drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c:513 amdgpu_get_xgmi_hive()
	warn: sleeping in atomic context

drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
    500 struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev)
    501 {
    502         struct amdgpu_hive_info *hive = NULL;
    503         int ret;
    504 
    505         if (!adev->gmc.xgmi.hive_id)
    506                 return NULL;
    507 
    508         if (adev->hive) {
    509                 kobject_get(&adev->hive->kobj);
    510                 return adev->hive;
    511         }
    512 
--> 513         mutex_lock(&xgmi_mutex);

The patch adds a new caller amdgpu_gfx_disable_kcq() which is holding
spin_lock(&kiq->ring_lock).  And we can't take a mutex if we're already
holding a spin_lock.  Turn on CONFIG_DEBUG_ATOMIC_SLEEP to see the
warning.


regards,
dan carpenter