linux-kernel - [PATCH v2 78/79] media: rcar-vin: use pm_runtime_resume_and

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Date:   Tue, 27 Apr 2021 12:13:45 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>
Subject: [PATCH v2 78/79] media: rcar-vin: use pm_runtime_resume_and_get()

Commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
added pm_runtime_resume_and_get() in order to automatically handle
dev->power.usage_count decrement on errors.

Use the new API, in order to cleanup the error check logic.

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 drivers/media/platform/rcar-vin/rcar-csi2.c | 6 ++++++
 drivers/media/platform/rcar-vin/rcar-dma.c  | 6 ++----
 drivers/media/platform/rcar-vin/rcar-v4l2.c | 6 ++----
 3 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
index e06cd512aba2..ce8e84f9e3d9 100644
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -408,6 +408,12 @@ static void rcsi2_enter_standby(struct rcar_csi2 *priv)
 
 static void rcsi2_exit_standby(struct rcar_csi2 *priv)
 {
+	/*
+	 * The code at rcsi2_enter_standby() assumes
+	 * inconditionally that PM runtime usage count was
+	 * incremented. So, it shouldn't use pm_runtime_resume_and_get()
+	 * here.
+	 */
 	pm_runtime_get_sync(priv->dev);
 	reset_control_deassert(priv->rstc);
 }
diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
index f30dafbdf61c..f5f722ab1d4e 100644
--- a/drivers/media/platform/rcar-vin/rcar-dma.c
+++ b/drivers/media/platform/rcar-vin/rcar-dma.c
@@ -1458,11 +1458,9 @@ int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel)
 	u32 vnmc;
 	int ret;
 
-	ret = pm_runtime_get_sync(vin->dev);
-	if (ret < 0) {
-		pm_runtime_put_noidle(vin->dev);
+	ret = pm_runtime_resume_and_get(vin->dev);
+	if (ret < 0)
 		return ret;
-	}
 
 	/* Make register writes take effect immediately. */
 	vnmc = rvin_read(vin, VNMC_REG);
diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c b/drivers/media/platform/rcar-vin/rcar-v4l2.c
index 457a65bf6b66..b1e9f86caa5c 100644
--- a/drivers/media/platform/rcar-vin/rcar-v4l2.c
+++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
@@ -870,11 +870,9 @@ static int rvin_open(struct file *file)
 	struct rvin_dev *vin = video_drvdata(file);
 	int ret;
 
-	ret = pm_runtime_get_sync(vin->dev);
-	if (ret < 0) {
-		pm_runtime_put_noidle(vin->dev);
+	ret = pm_runtime_resume_and_get(vin->dev);
+	if (ret < 0)
 		return ret;
-	}
 
 	ret = mutex_lock_interruptible(&vin->lock);
 	if (ret)
-- 
2.30.2