linux-kernel - [PATCH 2/2] usb: gadget: s3c: Fix the error handling path in 's3c2410_udc

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Message-Id: <20210221074133.938017-1-christophe.jaillet@wanadoo.fr>
Date:   Sun, 21 Feb 2021 08:41:33 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     balbi@...nel.org, gregkh@...uxfoundation.org, krzk@...nel.org,
        nathan@...nel.org, ndesaulniers@...gle.com, arnd@...db.de,
        gustavoars@...nel.org, linux-arm-kernel@...ts.infradead.org
Cc:     linux-usb@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH 2/2] usb: gadget: s3c: Fix the error handling path in 's3c2410_udc_probe()'

Some 'clk_prepare_enable()' and 'clk_get()' must be undone in the error
handling path of the probe function, as already done in the remove
function.

Fixes: 1c6d47aa4f4b ("USB Gadget driver for Samsung s3c2410 ARM SoC")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
checkpatch reports:
WARNING: Unknown commit id '1c6d47aa4f4b', maybe rebased or not pulled?
According to https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/usb/gadget/s3c2410_udc.c?id=3fc154b6b8134b98bb94d60cad9a46ec1ffbe372
the commit ID looks correct to me. Maybe something should be tweaked somewhere
before applying, but I don't know what!
---
 drivers/usb/gadget/udc/s3c2410_udc.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/gadget/udc/s3c2410_udc.c b/drivers/usb/gadget/udc/s3c2410_udc.c
index 3fc436286bad..146250e93412 100644
--- a/drivers/usb/gadget/udc/s3c2410_udc.c
+++ b/drivers/usb/gadget/udc/s3c2410_udc.c
@@ -1750,7 +1750,8 @@ static int s3c2410_udc_probe(struct platform_device *pdev)
 	udc_clock = clk_get(NULL, "usb-device");
 	if (IS_ERR(udc_clock)) {
 		dev_err(dev, "failed to get udc clock source\n");
-		return PTR_ERR(udc_clock);
+		retval = PTR_ERR(udc_clock);
+		goto err_usb_bus_clk;
 	}
 
 	clk_prepare_enable(udc_clock);
@@ -1773,7 +1774,7 @@ static int s3c2410_udc_probe(struct platform_device *pdev)
 	base_addr = devm_platform_ioremap_resource(pdev, 0);
 	if (!base_addr) {
 		retval = -ENOMEM;
-		goto err;
+		goto err_udc_clk;
 	}
 
 	the_controller = udc;
@@ -1791,7 +1792,7 @@ static int s3c2410_udc_probe(struct platform_device *pdev)
 	if (retval != 0) {
 		dev_err(dev, "cannot get irq %i, err %d\n", irq_usbd, retval);
 		retval = -EBUSY;
-		goto err;
+		goto err_udc_clk;
 	}
 
 	dev_dbg(dev, "got irq %i\n", irq_usbd);
@@ -1862,7 +1863,14 @@ static int s3c2410_udc_probe(struct platform_device *pdev)
 		gpio_free(udc_info->vbus_pin);
 err_int:
 	free_irq(irq_usbd, udc);
-err:
+err_udc_clk:
+	clk_disable_unprepare(udc_clock);
+	clk_put(udc_clock);
+	udc_clock = NULL;
+err_usb_bus_clk:
+	clk_disable_unprepare(usb_bus_clock);
+	clk_put(usb_bus_clock);
+	usb_bus_clock = NULL;
 
 	return retval;
 }
-- 
2.27.0