linux-kernel - Re: [PATCH v2] usb: xhci: remove the code build warning

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Date:   Fri, 15 Jun 2018 12:40:04 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Dongjiu Geng <gengdongjiu@...wei.com>
Cc:     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
Subject: Re: [PATCH v2] usb: xhci: remove the code build warning

On Wed, Jun 06, 2018 at 10:36:59PM +0800, Dongjiu Geng wrote:
> 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>
> ---
> 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

What changed from v1?  Always put that below the --- line.

Please fix up and resend a v3.

thanks,

greg k-h