linux-kernel - [PATCH] [v3] PCI: rcar: Fix runtime PM imbalance on error

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Message-Id: <20200709064356.8800-1-dinghao.liu@zju.edu.cn>
Date:   Thu,  9 Jul 2020 14:43:56 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Hien Dang <hien.dang.eb@...esas.com>,
        linux-pci@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] [v3] PCI: rcar: Fix runtime PM imbalance on error

pm_runtime_get_sync() increments the runtime PM usage counter even
the call returns an error code. Thus a corresponding decrement is
needed on the error handling path to keep the counter balanced.

Fixes: 0df6150e7ceb ("PCI: rcar: Use runtime PM to control controller
clock")

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---

Changelog:

v2: - Remove unnecessary 'err_pm_put' label.
      Refine commit message.

v3: - Add Fixes tag.
      Rebase the patch on top of the latest kernel.
---
 drivers/pci/controller/pcie-rcar-host.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
index d210a36561be..060c24f5221e 100644
--- a/drivers/pci/controller/pcie-rcar-host.c
+++ b/drivers/pci/controller/pcie-rcar-host.c
@@ -986,7 +986,7 @@ static int rcar_pcie_probe(struct platform_device *pdev)
 	err = pm_runtime_get_sync(pcie->dev);
 	if (err < 0) {
 		dev_err(pcie->dev, "pm_runtime_get_sync failed\n");
-		goto err_pm_disable;
+		goto err_pm_put;
 	}
 
 	err = rcar_pcie_get_resources(host);
@@ -1057,8 +1057,6 @@ static int rcar_pcie_probe(struct platform_device *pdev)
 
 err_pm_put:
 	pm_runtime_put(dev);
-
-err_pm_disable:
 	pm_runtime_disable(dev);
 	pci_free_resource_list(&host->resources);
 
-- 
2.17.1