linux-kernel - Re: [PATCH v2] usb: ffs: fix regression when quirk_ep_out_aligned

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Date:	Mon, 13 Oct 2014 12:03:24 -0500
From:	Felipe Balbi <balbi@...com>
To:	David Cohen <david.a.cohen@...ux.intel.com>
CC:	Felipe Balbi <balbi@...com>, <gregkh@...uxfoundation.org>,
	<mina86@...a86.com>, <r.baldyga@...sung.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<stable@...r.kernel.org>, Qiuxu Zhuo <qiuxu.zhuo@...el.com>
Subject: Re: [PATCH v2] usb: ffs: fix regression when
 quirk_ep_out_aligned_size flag is set

On Mon, Oct 13, 2014 at 09:55:56AM -0700, David Cohen wrote:
> On Mon, Oct 13, 2014 at 10:32:12AM -0500, Felipe Balbi wrote:
> > On Wed, Oct 08, 2014 at 02:12:18PM -0700, David Cohen wrote:
> > > The commit '2e4c7553cd usb: gadget: f_fs: add aio support' broke the
> > > quirk implemented to align buffer size to maxpacketsize on out endpoint.
> > > As result, functionfs does not work on Intel platforms using dwc3 driver
> > > (i.e. Bay Trail and Merrifield). This patch fixes the issue.
> > > 
> > > This code is based on a previous Qiuxu's patch.
> > > 
> > > Fixes: 2e4c7553cd (usb: gadget: f_fs: add aio support)
> > > Cc: <stable@...r.kernel.org> # v3.16+
> > > Signed-off-by: David Cohen <david.a.cohen@...ux.intel.com>
> > > Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
> > > Acked-by: Michal Nazarewicz <mina86@...a86.com>
> > > ---
> > > 
> > > Hi,
> > > 
> > > Since this is a feature that worked in past, this is meant for stable
> > > versions >= 3.16 too.
> > > 
> > > v1 to v2: just added Fixes, Cc and Acked-by lines on patch description.
> > 
> > this adds a build warning for use of maybe unitialized data_len. Plese
> > fix.
> 
> It's a false-positive warning. data_len is only initialized if halt != 0
> and it's only used if halt != 0 too.
> 
> Do you prefer to initialize it to 0 during the declaration to silent the
> compiler?

yup.

-- 
balbi

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