[PATCH] drm/amdgpu: return err if input is not valid

[Pan, Xinhui]

Signed-off-by: xinhui pan <xinhui.pan at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index 8b1088dac686..1df6b03a3680 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -240,6 +240,9 @@ static int amdgpu_ras_debugfs_ctrl_parse_data(struct file *f,
 		op = 1;
 	else if (sscanf(str, "inject %32s %8s", block_name, err) == 2)
 		op = 2;
+	else if (sscanf(str, "%32s", block_name) == 1)
+		/* ascii string, but commands are not matched. */
+		return -EINVAL;
 
 	if (op != -1) {
 		if (amdgpu_ras_find_block_id_by_name(block_name, &block_id))
@@ -352,6 +355,9 @@ static ssize_t amdgpu_ras_debugfs_ctrl_write(struct file *f, const char __user *
 	case 2:
 		ret = amdgpu_ras_error_inject(adev, &data.inject);
 		break;
+	default:
+		ret = -EINVAL;
+		break;
 	};
 
 	if (ret)
-- 
2.17.1