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

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Message-ID: <20141013165556.GA4034@psi-dev26.jf.intel.com>
Date:	Mon, 13 Oct 2014 09:55:56 -0700
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	Felipe Balbi <balbi@...com>
Cc:	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 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?

BR, David

> 
> -- 
> balbi


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