[PATCH 02/20] drm/amdgpu: don't trample pdev drvdata

[Matthew Auld <matthew.auld@intel.com>]

The driver release callback is called when a particular drm_device goes
away, just like with drmm, so here we should never nuke the pdev drvdata
pointer, since that could already be pointing to a new drvdata.
For example something hotunplugs the device, for which we have an open
driver fd, keeping the drm_device alive, and in the meantime the same
physical device is re-attached to a new drm_device therefore setting
drvdata again. Once the original drm_device goes away, we might then
call the release which then incorrectly tramples the drvdata.

The driver core will already nuke the pointer for us when the pci device
is removed, so should be safe to simply drop. Alternative would be to
move to the driver pci remove callback.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index a0ea6fe8d060..d5fed007c698 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -1450,7 +1450,6 @@ void amdgpu_driver_release_kms(struct drm_device *dev)
 	struct amdgpu_device *adev = drm_to_adev(dev);
 
 	amdgpu_device_fini_sw(adev);
-	pci_set_drvdata(adev->pdev, NULL);
 }
 
 /*
-- 
2.45.0