[PATCH v2] drm/xe/client: Check return value of xe_force_wake_get

[Nirmoy Das]

xe_force_wake_get() can return error so check it's return value
before reading gpu_timestamp value.

v2: set HWE to NULL instead of setting timestamp to 0(Lucas)
    Add a warn on for xe_force_wake_put(Himal)

Fixes: 188ced1e0ff8 ("drm/xe/client: Print runtime to fdinfo")
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
---
 drivers/gpu/drm/xe/xe_drm_client.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_drm_client.c b/drivers/gpu/drm/xe/xe_drm_client.c
index 4a19b771e3a0..4bdb909eabfc 100644
--- a/drivers/gpu/drm/xe/xe_drm_client.c
+++ b/drivers/gpu/drm/xe/xe_drm_client.c
@@ -264,9 +264,13 @@ static void show_run_ticks(struct drm_printer *p, struct drm_file *file)
 		if (!hwe)
 			continue;
 
-		xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
+		if (xe_force_wake_get(gt_to_fw(gt), XE_FW_GT)) {
+			hwe = NULL;
+			break;
+		}
+
 		gpu_timestamp = xe_hw_engine_read_timestamp(hwe);
-		xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
+		XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FW_GT));
 		break;
 	}
 
-- 
2.42.0