linux-kernel - [PATCH v2] net: wwan: qcom_bam_dmux: Fix missing pm_runtime

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Message-ID: <20240923115743.3563079-1-ruanjinjie@huawei.com>
Date: Mon, 23 Sep 2024 19:57:43 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <stephan@...hold.net>, <loic.poulain@...aro.org>,
	<ryazanov.s.a@...il.com>, <johannes@...solutions.net>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<linux-arm-msm@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <ruanjinjie@...wei.com>
Subject: [PATCH v2] net: wwan: qcom_bam_dmux: Fix missing pm_runtime_disable()

It's important to undo pm_runtime_use_autosuspend() with
pm_runtime_dont_use_autosuspend() at driver exit time.

But the pm_runtime_disable() and pm_runtime_dont_use_autosuspend()
is missing in the error path for bam_dmux_probe(). So add it.

Found by code review. Compile-tested only.

Fixes: 21a0ffd9b38c ("net: wwan: Add Qualcomm BAM-DMUX WWAN network driver")
Suggested-by: Stephan Gerhold <stephan.gerhold@...aro.org>
Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
---
v2:
- Drop the unneeded pm_runtime_set_suspended().
- Add Suggested-by.
- Update the commit message.
---
 drivers/net/wwan/qcom_bam_dmux.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wwan/qcom_bam_dmux.c b/drivers/net/wwan/qcom_bam_dmux.c
index 26ca719fa0de..5dcb9a84a12e 100644
--- a/drivers/net/wwan/qcom_bam_dmux.c
+++ b/drivers/net/wwan/qcom_bam_dmux.c
@@ -823,17 +823,17 @@ static int bam_dmux_probe(struct platform_device *pdev)
 	ret = devm_request_threaded_irq(dev, pc_ack_irq, NULL, bam_dmux_pc_ack_irq,
 					IRQF_ONESHOT, NULL, dmux);
 	if (ret)
-		return ret;
+		goto err_disable_pm;
 
 	ret = devm_request_threaded_irq(dev, dmux->pc_irq, NULL, bam_dmux_pc_irq,
 					IRQF_ONESHOT, NULL, dmux);
 	if (ret)
-		return ret;
+		goto err_disable_pm;
 
 	ret = irq_get_irqchip_state(dmux->pc_irq, IRQCHIP_STATE_LINE_LEVEL,
 				    &dmux->pc_state);
 	if (ret)
-		return ret;
+		goto err_disable_pm;
 
 	/* Check if remote finished initialization before us */
 	if (dmux->pc_state) {
@@ -844,6 +844,11 @@ static int bam_dmux_probe(struct platform_device *pdev)
 	}
 
 	return 0;
+
+err_disable_pm:
+	pm_runtime_disable(dev);
+	pm_runtime_dont_use_autosuspend(dev);
+	return ret;
 }
 
 static void bam_dmux_remove(struct platform_device *pdev)
-- 
2.34.1