linux-kernel - [PATCH v3] usb: xhci: remove the code build warning

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Date:   Sun, 17 Jun 2018 10:30:18 +0800
From:   Dongjiu Geng <gengdongjiu@...wei.com>
To:     <gregkh@...uxfoundation.org>, <mathias.nyman@...el.com>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <linux-usb@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <gengdongjiu@...wei.com>
Subject: [PATCH v3] usb: xhci: remove the code build warning

Initialize the 'err' variate to remove the build warning,
the warning is shown as below:

drivers/usb/host/xhci-tegra.c: In function 'tegra_xusb_mbox_thread':
drivers/usb/host/xhci-tegra.c:552:6: warning: 'err' may be used uninitialized in this function [-Wuninitialized]
drivers/usb/host/xhci-tegra.c:482:6: note: 'err' was declared here

Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
Acked-by: Thierry Reding <treding@...dia.com>
---
change since v1:
1. Add 'Acked-by: Thierry Reding <treding@...dia.com>'

How to reproduce:
1. make defconfig ARCH=arm
2. make -j100 CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm

Then you can see below warnings:
drivers/usb/host/xhci-tegra.c: In function 'tegra_xusb_mbox_thread':
drivers/usb/host/xhci-tegra.c:552:6: warning: 'err' may be used uninitialized in this function [-Wuninitialized]
drivers/usb/host/xhci-tegra.c:482:6: note: 'err' was declared here
---
 drivers/usb/host/xhci-tegra.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
index a8c1d07..d50549f 100644
--- a/drivers/usb/host/xhci-tegra.c
+++ b/drivers/usb/host/xhci-tegra.c
@@ -481,7 +481,7 @@ static void tegra_xusb_mbox_handle(struct tegra_xusb *tegra,
 	unsigned long mask;
 	unsigned int port;
 	bool idle, enable;
-	int err;
+	int err = 0;
 
 	memset(&rsp, 0, sizeof(rsp));
 
-- 
1.9.1