drm/amdgpu: Fix potential null pointer derefernce

The amdgpu_ras_get_context may return NULL if device
not support ras feature, so add check before using.

Signed-off-by: Stanley.Yang <Stanley.Yang@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 0cb702c3046a9c23c97dc84da4f94d13d02c4d7a..d5b81a086e699ab365b9ffa0169c3c9cf3e015c5 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -5438,7 +5438,8 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
         * Flush RAM to disk so that after reboot
         * the user can read log and see why the system rebooted.
         */
-       if (need_emergency_restart && amdgpu_ras_get_context(adev)->reboot) {
+       if (need_emergency_restart && amdgpu_ras_get_context(adev) &&
+               amdgpu_ras_get_context(adev)->reboot) {
                DRM_WARN("Emergency reboot.");
 
                ksys_sync_helper();