linux-kernel - Re: [PATCH 1/2] usb: gadget: f_fs: remove loop from I/O function

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Date:	Mon, 11 Nov 2013 15:11:31 -0800
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	Michal Nazarewicz <mpn@...gle.com>
CC:	Alan Stern <stern@...land.harvard.edu>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, Michal Nazarewicz <mina86@...a86.com>
Subject: Re: [PATCH 1/2] usb: gadget: f_fs: remove loop from I/O function

Hi Michal,

On 11/10/2013 08:50 AM, Michal Nazarewicz wrote:
> From: Michal Nazarewicz <mina86@...a86.com>
>
> When endpoint changes (due to it being disabled or alt setting changed),
> mimic the action as if the change happened after the request has been
> queued, instead of retrying with the new endpoint.
>
> Signed-off-by: Michal Nazarewicz <mina86@...a86.com>
> ---
>   drivers/usb/gadget/f_fs.c | 94 +++++++++++++++++++++--------------------------
>   1 file changed, 41 insertions(+), 53 deletions(-)
>
> diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
> index 44cf775..f875f26 100644
> --- a/drivers/usb/gadget/f_fs.c
> +++ b/drivers/usb/gadget/f_fs.c
> @@ -754,74 +754,61 @@ static ssize_t ffs_epfile_io(struct file *file,
>   {
>   	struct ffs_epfile *epfile = file->private_data;
>   	struct ffs_ep *ep;
> -	char *data = NULL;
>   	ssize_t ret;
> +	char *data;

You can't non-initialize data, otherwise we'll end up with this correct
warning:
drivers/usb/gadget/f_fs.c:866:7: warning: 'data' may be used 
uninitialized in this function [-Wmaybe-uninitialized]

If you agree, you can send v5.1 to my 5th patch set (or let me handle
it).

Br, David
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