linux-kernel - [PATCH v2] PCI: mediatek: Check return value of clk_prepare

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Message-Id: <20210430155429.35034-1-ameynarkhede03@gmail.com>
Date:   Fri, 30 Apr 2021 21:24:29 +0530
From:   Amey Narkhede <ameynarkhede03@...il.com>
To:     Ryder Lee <ryder.lee@...iatek.com>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Amey Narkhede <ameynarkhede03@...il.com>
Subject: [PATCH v2] PCI: mediatek: Check return value of clk_prepare_enable

In case when free_ck clock is not enabled during device resume
check the return value of clk_prepare_enable() and return the
error after printing it.

Signed-off-by: Amey Narkhede <ameynarkhede03@...il.com>
---
Changes in v2:
	- Print the error before returning
	- Clarify commit log
 drivers/pci/controller/pcie-mediatek.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index 23548b517..9bdae34cc 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -1154,11 +1154,16 @@ static int __maybe_unused mtk_pcie_resume_noirq(struct device *dev)
 {
 	struct mtk_pcie *pcie = dev_get_drvdata(dev);
 	struct mtk_pcie_port *port, *tmp;
+	int ret;

 	if (list_empty(&pcie->ports))
 		return 0;

-	clk_prepare_enable(pcie->free_ck);
+	ret = clk_prepare_enable(pcie->free_ck);
+	if (ret) {
+		dev_err(dev, "Failed to enable free_ck clock\n");
+		return ret;
+	}

 	list_for_each_entry_safe(port, tmp, &pcie->ports, list)
 		mtk_pcie_enable_port(port);
--
2.31.1