linux-kernel - [PATCH 02/12] slimbus: qcom-ngd-ctrl: drop PM runtime counter on transfer error paths

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Date:   Fri, 18 Nov 2022 06:52:36 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 02/12] slimbus: qcom-ngd-ctrl: drop PM runtime counter on transfer error paths

From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

If transfer in qcom_slim_ngd_xfer_msg_sync() fails, we need to drop the
PM runtime usage counter to have it balanced.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/slimbus/qcom-ngd-ctrl.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index 964adf77b51b..d48e58ca5d58 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -919,21 +919,29 @@ static int qcom_slim_ngd_xfer_msg_sync(struct slim_controller *ctrl,
 	DECLARE_COMPLETION_ONSTACK(done);
 	int ret, timeout;
 
-	pm_runtime_get_sync(ctrl->dev);
+	ret = pm_runtime_get_sync(ctrl->dev);
+	if (ret < 0)
+		goto pm_put;
 
 	txn->comp = &done;
 
 	ret = qcom_slim_ngd_xfer_msg(ctrl, txn);
 	if (ret)
-		return ret;
+		goto pm_put;
 
 	timeout = wait_for_completion_timeout(&done, HZ);
 	if (!timeout) {
 		dev_err(ctrl->dev, "TX timed out:MC:0x%x,mt:0x%x", txn->mc,
 				txn->mt);
-		return -ETIMEDOUT;
+		ret = -ETIMEDOUT;
+		goto pm_put;
 	}
 	return 0;
+
+pm_put:
+	pm_runtime_put(ctrl->dev);
+
+	return ret;
 }
 
 static int qcom_slim_ngd_enable_stream(struct slim_stream_runtime *rt)
-- 
2.25.1