linux-kernel - Re: [PATCH] usb/gadget: initialize gadget functions helper befor functions & gadgets

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Message-ID: <20130305103513.GA31454@localhost>
Date:	Tue, 5 Mar 2013 18:35:13 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Cc:	linux-usb@...r.kernel.org, Felipe Balbi <balbi@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb/gadget: initialize gadget functions helper befor
 functions & gadgets

On Tue, Mar 05, 2013 at 05:57:34PM +0800, Fengguang Wu wrote:
> On Mon, Mar 04, 2013 at 10:28:09PM +0100, Sebastian Andrzej Siewior wrote:
> > Fengguang Wu run into a kernel ops after he complied dummy_hcd and g_cdc
> > into the kernel. The problem was that u_serial was used by g_cdc before
> > u_serial was initialized. In the module case eveything is initialized in
> > the correct order but if we compile it into the kernel we rely on
> > Makefile order which I did wrong and now I correct this.
> > 
> > Cc: Fengguang Wu <fengguang.wu@...el.com>
> > Signed-off-by: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
> 
> Tested-by: Fengguang Wu <fengguang.wu@...el.com>

Note that I still get this warning, however looks like an unrelated
issue:

[  602.536679] [ INFO: possible circular locking dependency detected ]
[  602.536672] 
[  602.536679] ======================================================
[  602.536679] [ INFO: possible circular locking dependency detected ]
[  602.536693] 3.8.0-bisect-next-20130301-dirty #212 Not tainted
[  602.536694] -------------------------------------------------------
[  602.536698] kworker/0:1/27 is trying to acquire lock:
[  602.536750]  (&fb_info->lock){+.+.+.}, at: [<ffffffff814c0176>] lock_fb_info+0x26/0x60
[  602.536751] 
[  602.536751] but task is already holding lock:
[  602.536773]  (console_lock){+.+.+.}, at: [<ffffffff815a6a13>] console_callback+0x13/0x150
[  602.536774]                 
[  602.536774] which lock already depends on the new lock.

Thanks,
Fengguang
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