[PATCH] drm/xe/guc: Check response data of CLIENT_SOFT_RESET action

[Michal Wajdeczko]

Treat unexpected non-zero response data from GuC as -EPROTO error.
This will also prevent passing positive value to ERR_PTR().

Reported-by: Dan Carpenter <dan.carpenter at linaro.org>
Closes: https://lore.kernel.org/intel-xe/5fd5a4b9-88ee-47f1-ac3e-32a20960c5b0@stanley.mountain/
Fixes: 12f95f9900c0 ("drm/xe/guc: Prefer GT oriented logs for GuC messages")
Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Dan Carpenter <dan.carpenter at linaro.org>
Cc: Matthew Brost <matthew.brost at intel.com>
---
 drivers/gpu/drm/xe/xe_guc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_guc.c b/drivers/gpu/drm/xe/xe_guc.c
index 1619c0a52db9..bb03db361512 100644
--- a/drivers/gpu/drm/xe/xe_guc.c
+++ b/drivers/gpu/drm/xe/xe_guc.c
@@ -1238,6 +1238,8 @@ int xe_guc_suspend(struct xe_guc *guc)
 
 	ret = xe_guc_mmio_send(guc, action, ARRAY_SIZE(action));
 	if (ret) {
+		if (ret > 0)
+			ret = -EPROTO;
 		xe_gt_err(gt, "GuC suspend failed: %pe\n", ERR_PTR(ret));
 		return ret;
 	}
-- 
2.47.1