linux-kernel - [PATCH] usb: dwc3: of-simple: fix missing clk_disable

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Date:   Thu,  7 Dec 2017 11:32:20 +0100
From:   Andreas Platschek <andreas.platschek@...ntech.at>
To:     balbi@...nel.org
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andreas Platschek <andreas.platschek@...ntech.at>
Subject: [PATCH] usb: dwc3: of-simple: fix missing clk_disable_unprepare

If of_clk_get() fails, the clean-up of already initialized clocks should be
the same as when clk_prepare_enable() fails. Thus a clk_disable_unprepare()
for each clock should be called before the clk_put().

Found by Linux Driver Verification project (linuxtesting.org).

Fixes: 16adc674d0d6 ("usb: dwc3: ep0: fix setup_packet_pending initialization")

Signed-off-by: Andreas Platschek <andreas.platschek@...ntech.at>
---
NOTE: This was only compile-tested

 drivers/usb/dwc3/dwc3-of-simple.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
index c4a4d7bd2766..762370dd7c75 100644
--- a/drivers/usb/dwc3/dwc3-of-simple.c
+++ b/drivers/usb/dwc3/dwc3-of-simple.c
@@ -51,8 +51,10 @@ static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count)
 
 		clk = of_clk_get(np, i);
 		if (IS_ERR(clk)) {
-			while (--i >= 0)
+			while (--i >= 0) {
+				clk_disable_unprepare(simple->clks[i]);
 				clk_put(simple->clks[i]);
+			}
 			return PTR_ERR(clk);
 		}
 
-- 
2.11.0