[PATCH] drm/amdgpu: return an error for hw access in INFO ioctl when in reset

[Alex Deucher]

When the GPU is in reset, accessing the hw is unreliable and could
interfere with the reset.  Return an error in those cases.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 341d072edd95..fd51d6554ee2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -684,6 +684,9 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
 		if (info->read_mmr_reg.count > 128)
 			return -EINVAL;
 
+		if (adev->in_gpu_reset)
+			return -EPERM;
+
 		regs = kmalloc_array(info->read_mmr_reg.count, sizeof(*regs), GFP_KERNEL);
 		if (!regs)
 			return -ENOMEM;
@@ -854,6 +857,9 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
 		if (!adev->pm.dpm_enabled)
 			return -ENOENT;
 
+		if (adev->in_gpu_reset)
+			return -EPERM;
+
 		switch (info->sensor_info.type) {
 		case AMDGPU_INFO_SENSOR_GFX_SCLK:
 			/* get sclk in Mhz */
-- 
2.25.4