linux-kernel - [PATCH] usb: gadget: udc-xilinx: Fix an error handling path in 'xudc

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Date:   Sun,  7 Nov 2021 17:25:48 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     balbi@...nel.org, gregkh@...uxfoundation.org,
        michal.simek@...inx.com, lee.jones@...aro.org,
        jiapeng.chong@...ux.alibaba.com, abaci-bugfix@...ux.alibaba.com,
        shubhrajyoti.datta@...inx.com
Cc:     linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] usb: gadget: udc-xilinx: Fix an error handling path in 'xudc_probe()'

A successful 'clk_prepare_enable()' call should be balanced by a
corresponding 'clk_disable_unprepare()' call in the error handling path
of the probe, as already done in the remove function.

Fixes: 24749229211c ("usb: gadget: udc-xilinx: Add clock support")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/usb/gadget/udc/udc-xilinx.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/udc-xilinx.c b/drivers/usb/gadget/udc/udc-xilinx.c
index f5ca670776a3..857159dd5ae0 100644
--- a/drivers/usb/gadget/udc/udc-xilinx.c
+++ b/drivers/usb/gadget/udc/udc-xilinx.c
@@ -2136,7 +2136,7 @@ static int xudc_probe(struct platform_device *pdev)
 
 	ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
 	if (ret)
-		goto fail;
+		goto err_disable_unprepare_clk;
 
 	udc->dev = &udc->gadget.dev;
 
@@ -2155,6 +2155,9 @@ static int xudc_probe(struct platform_device *pdev)
 		 udc->dma_enabled ? "with DMA" : "without DMA");
 
 	return 0;
+
+err_disable_unprepare_clk:
+	clk_disable_unprepare(udc->clk);
 fail:
 	dev_err(&pdev->dev, "probe failed, %d\n", ret);
 	return ret;
-- 
2.30.2