From: Yaxiong Tian <tianyaxiong@kylinos.cn>

Currently the function fails silently on PST table memory allocation failure.
Add warning messages to improve error visibility.

Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Yaxiong Tian <tianyaxiong@kylinos.cn>
---
 drivers/nvme/host/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index c2d89fac86c5..eca0d0d2c2b4 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2678,8 +2678,11 @@ static int nvme_configure_apst(struct nvme_ctrl *ctrl)
 	}
 
 	table = kzalloc(sizeof(*table), GFP_KERNEL);
-	if (!table)
+	if (!table) {
+		dev_warn(ctrl->device,
+				 "Failed to allocate pst table; not using APST\n");
 		return 0;
+	}
 
 	if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
 		/* Turn off APST. */
-- 
2.25.1