[PATCH 1/2] drm/amdgpu:fix virtual dce bug

[Jan Vesely]

On Thu, 2017-11-16 at 11:14 +0800, Monk Liu wrote:
> this fix the issue that access memory after freed
> after driver unloaded.

can you please change the patch subject and commit message to something
more descriptive?

Jan

> 
> Change-Id: I64e2488c18f5dc044b57c74567785da21fc028da
> Signed-off-by: Monk Liu <Monk.Liu at amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/dce_virtual.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
> index a8829af..39460eb 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
> @@ -437,6 +437,8 @@ static int dce_virtual_sw_fini(void *handle)
>  	drm_kms_helper_poll_fini(adev->ddev);
>  
>  	drm_mode_config_cleanup(adev->ddev);
> +	/* clear crtcs pointer to avoid dce irq finish routine access freed data */
> +	memset(adev->mode_info.crtcs, 0, sizeof(adev->mode_info.crtcs[0]) * AMDGPU_MAX_CRTCS);
>  	adev->mode_info.mode_config_initialized = false;
>  	return 0;
>  }
> @@ -723,7 +725,7 @@ static void dce_virtual_set_crtc_vblank_interrupt_state(struct amdgpu_device *ad
>  							int crtc,
>  							enum amdgpu_interrupt_state state)
>  {
> -	if (crtc >= adev->mode_info.num_crtc) {
> +	if (crtc >= adev->mode_info.num_crtc || !adev->mode_info.crtcs[crtc]) {
>  		DRM_DEBUG("invalid crtc %d\n", crtc);
>  		return;
>  	}
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