linux-kernel - [PATCH v3 5/6] usb: chipidea: msm: get optional clock by devm_clk_get

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Date:   Wed, 17 Apr 2019 16:28:20 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Mathias Nyman <mathias.nyman@...el.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Peter Chen <Peter.Chen@....com>
Subject: [PATCH v3 5/6] usb: chipidea: msm: get optional clock by devm_clk_get_optional()

When the driver tries to get optional clock, it ignores all errors except
-EPROBE_DEFER, but if only ignores -ENOENT, it will cover some real errors,
such as -ENOMEM, so use devm_clk_get_optional() to get optional clock.

Cc: Peter Chen <Peter.Chen@....com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
Acked-by: Peter Chen <Peter.Chen@....com>
---
v3: modify changelog comment
v2: add Acked-by Peter Chen
---
 drivers/usb/chipidea/ci_hdrc_msm.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
index 880009987460..b8b3caad889c 100644
--- a/drivers/usb/chipidea/ci_hdrc_msm.c
+++ b/drivers/usb/chipidea/ci_hdrc_msm.c
@@ -205,12 +205,9 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);
 
-	ci->fs_clk = clk = devm_clk_get(&pdev->dev, "fs");
-	if (IS_ERR(clk)) {
-		if (PTR_ERR(clk) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
-		ci->fs_clk = NULL;
-	}
+	ci->fs_clk = clk = devm_clk_get_optional(&pdev->dev, "fs");
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	ci->base = devm_ioremap_resource(&pdev->dev, res);
-- 
2.21.0