linux-kernel - RE: [PATCH v1] USB:gadget: Fix a warning while loading g_mass

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Date:	Wed, 4 Jun 2014 01:45:23 +0000
From:	Peter Chen <Peter.Chen@...escale.com>
To:	"Yang,Wei" <Wei.Yang@...driver.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Michal Nazarewicz <mina86@...a86.com>,
	"Andrzej Pietrasiewicz" <andrzej.p@...sung.com>
CC:	Felipe Balbi <balbi@...com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	USB list <linux-usb@...r.kernel.org>,
	"Kernel development list" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1] USB:gadget: Fix a warning while loading g_mass_storage

 
> 
> commit d18f7116a5ddb8263fe62b05ad63e5ceb5875791
> Author: Robert Baldyga <r.baldyga@...sung.com>
> Date:   Thu Nov 21 13:49:18 2013 +0100
> 
>      usb: gadget: s3c-hsotg: fix disconnect handling
> 
>      This patch moves s3c_hsotg_disconnect function call from USBSusp
> interrupt
>      handler to SET_ADDRESS request handler.
> 

It is a little strange we call gadget's disconnect at SET_ADDRESS?
How the udc calls gadget driver the disconnection has happened when
the usb cable is disconnected from the host?

Usually, we call gadget's disconnect at two situations

- udc's reset handler if udc's speed is not UNKNOWN, it is usually happened
when the host sends reset after enumeration.
- udc's disconnect handler, it is usually happened when the usb cable
is disconnected from host.

Peter
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