5.15-stable review patch. If anyone has any objections, please let me know.
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From: Friedrich Vock friedrich.vock@gmx.de
[ Upstream commit 0cdb3f9740844b9d95ca413e3fcff11f81223ecf ]
The special case for VM passthrough doesn't check adev->nbio.funcs before dereferencing it. If GPUs that don't have an NBIO block are passed through, this leads to a NULL pointer dereference on startup.
Signed-off-by: Friedrich Vock friedrich.vock@gmx.de Fixes: 1bece222eabe ("drm/amdgpu: Clear doorbell interrupt status for Sienna Cichlid") Cc: Alex Deucher alexander.deucher@amd.com Cc: Christian König christian.koenig@amd.com Acked-by: Christian König christian.koenig@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 5f6c32ec674d3..300d3b236bb35 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -5531,7 +5531,7 @@ int amdgpu_device_baco_exit(struct drm_device *dev) adev->nbio.funcs->enable_doorbell_interrupt) adev->nbio.funcs->enable_doorbell_interrupt(adev, true);
- if (amdgpu_passthrough(adev) && + if (amdgpu_passthrough(adev) && adev->nbio.funcs && adev->nbio.funcs->clear_doorbell_interrupt) adev->nbio.funcs->clear_doorbell_interrupt(adev);