From mboxrd@z Thu Jan  1 00:00:00 1970
From: r.baldyga@hackerion.com (Robert Baldyga)
Date: Thu, 20 Aug 2015 18:28:14 +0200
Subject: [PATCH v5 01/46] usb: gadget: encapsulate endpoint claiming
 mechanism
In-Reply-To: <20150820153553.GD1639@saruman.tx.rr.com>
References: <1438351258-31578-1-git-send-email-r.baldyga@samsung.com>
 <1438351258-31578-2-git-send-email-r.baldyga@samsung.com>
 <20150820153553.GD1639@saruman.tx.rr.com>
Message-ID: <55D6001E.3000504@hackerion.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hi Felipe,

On 08/20/2015 05:35 PM, Felipe Balbi wrote:
[...]
> just letting you know that this regresses all gadget drivers making them
> try to disable previously disabled endpoints and enable previously
> enabled endpoints.
>
> I have a possible fix (see below) but then it shows a problem on the
> host side when using with g_zero (see further below):
>
> commit 3b8932100aacb6cfbffe288ca93025d8b8430c00
> Author: Felipe Balbi <balbi@ti.com>
> Date:   Wed Aug 19 18:05:27 2015 -0500
>
>      usb: gadget: fix ep->claimed lifetime
>
>      In order to fix a regression introduced by commit
>      cc476b42a39d ("usb: gadget: encapsulate endpoint
>      claiming mechanism") we have to introduce a simple
>      helper to check if a particular is enabled or not.
>
>      After that, we need to move ep->claimed lifetime to
>      usb_ep_enable() and usb_ep_disable() since those
>      are the only functions which actually enable and
>      disable endpoints.
>
>      A follow-up patch will come to drop all driver_data
>      checks from function drivers, since those are, now,
>      pointless.
>
>      Fixes: cc476b42a39d ("usb: gadget: encapsulate endpoint
>      	claiming mechanism")
>      Cc: Robert Baldyga <r.baldyga@samsung.com>
>      Signed-off-by: Felipe Balbi <balbi@ti.com>
>
> diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c
> index 978435a51038..ad45070cd76f 100644
> --- a/drivers/usb/gadget/epautoconf.c
> +++ b/drivers/usb/gadget/epautoconf.c
> @@ -126,7 +126,6 @@ found_ep:
>   	ep->address = desc->bEndpointAddress;
>   	ep->desc = NULL;
>   	ep->comp_desc = NULL;
> -	ep->claimed = true;

Removing this line causes autoconfig can return the same endpoint many 
times. This probably causes problems with g_zero.

I will try to fix it ASAP.

Thanks,
Robert