linux-kernel - [PATCH 02/13] net: ravb: Use pm_runtime_resume_and

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Message-Id: <20231120084606.4083194-3-claudiu.beznea.uj@bp.renesas.com>
Date:   Mon, 20 Nov 2023 10:45:55 +0200
From:   Claudiu <claudiu.beznea@...on.dev>
To:     s.shtylyov@....ru, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, p.zabel@...gutronix.de,
        yoshihiro.shimoda.uh@...esas.com, geert+renesas@...der.be,
        wsa+renesas@...g-engineering.com, biju.das.jz@...renesas.com,
        prabhakar.mahadev-lad.rj@...renesas.com,
        sergei.shtylyov@...entembedded.com,
        mitsuhiro.kimura.kc@...esas.com, masaru.nagai.vx@...esas.com
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH 02/13] net: ravb: Use pm_runtime_resume_and_get()

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

pm_runtime_get_sync() may return with error. In case it returns with error
dev->power.usage_count needs to be decremented. pm_runtime_resume_and_get()
takes care of this. Thus use it.

Along with this pm_runtime_resume_and_get() and reset_control_deassert()
were moved before alloc_etherdev_mqs() to simplify the error path.

Also, in case pm_runtime_resume_and_get() returns error the reset signal
is deasserted and runtime PM is disabled (by jumping to the proper
error handling label).

Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---
 drivers/net/ethernet/renesas/ravb_main.c | 28 +++++++++++++-----------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 342978bdbd7e..0486add302b3 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2635,25 +2635,26 @@ static int ravb_probe(struct platform_device *pdev)
 		return dev_err_probe(&pdev->dev, PTR_ERR(rstc),
 				     "failed to get cpg reset\n");
 
+	error = reset_control_deassert(rstc);
+	if (error)
+		return error;
+
+	pm_runtime_enable(&pdev->dev);
+	error = pm_runtime_resume_and_get(&pdev->dev);
+	if (error < 0)
+		goto pm_runtime_disable;
+
 	ndev = alloc_etherdev_mqs(sizeof(struct ravb_private),
 				  NUM_TX_QUEUE, NUM_RX_QUEUE);
-	if (!ndev)
-		return -ENOMEM;
-
+	if (!ndev) {
+		error = -ENOMEM;
+		goto pm_runtime_put;
+	}
 	info = of_device_get_match_data(&pdev->dev);
 
 	ndev->features = info->net_features;
 	ndev->hw_features = info->net_hw_features;
 
-	error = reset_control_deassert(rstc);
-	if (error) {
-		free_netdev(ndev);
-		return error;
-	}
-
-	pm_runtime_enable(&pdev->dev);
-	pm_runtime_get_sync(&pdev->dev);
-
 	if (info->multi_irqs) {
 		if (info->err_mgmt_irqs)
 			irq = platform_get_irq_byname(pdev, "dia");
@@ -2878,8 +2879,9 @@ static int ravb_probe(struct platform_device *pdev)
 	clk_disable_unprepare(priv->refclk);
 out_release:
 	free_netdev(ndev);
-
+pm_runtime_put:
 	pm_runtime_put(&pdev->dev);
+pm_runtime_disable:
 	pm_runtime_disable(&pdev->dev);
 	reset_control_assert(rstc);
 	return error;
-- 
2.39.2