linux-kernel - Re: [PATCH] usb: isp1760: fix spin unlock in the error path of isp1760_udc

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Date:	Tue, 24 Mar 2015 11:38:40 -0500
From:	Felipe Balbi <balbi@...com>
To:	Felipe Balbi <balbi@...com>
CC:	Sudeep Holla <sudeep.holla@....com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: isp1760: fix spin unlock in the error path of
 isp1760_udc_start

On Tue, Mar 24, 2015 at 11:37:43AM -0500, Felipe Balbi wrote:
> On Fri, Mar 20, 2015 at 02:27:40PM +0000, Sudeep Holla wrote:
> > Hi Laurent,
> > 
> > On 20/03/15 14:20, Laurent Pinchart wrote:
> > >Hi Sudeep,
> > >
> > >Thank you for the patch.
> > >
> > >On Friday 20 March 2015 11:42:17 Sudeep Holla wrote:
> > >>Commit a124820de5fd ("usb: isp1760: fix possible deadlock in
> > >>isp1760_udc_irq") replaced spin_{un,}lock with
> > >>spin_{un,}lock_irq{save,restore}. However it missed an error path resulting
> > >>in the smatch warning as below:
> > >>
> > >>drivers/usb/isp1760/isp1760-udc.c:1230 isp1760_udc_start() warn:
> > >>inconsistent returns 'irqsave:flags'. Locked on:   line 1207
> > >>Unlocked on: line 1199
> > >>
> > >>This patch fixes the spin unlock in the error path in isp1760_udc_start
> > >>thereby removing the smatch warning mentioned above.
> > >>
> > >>Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> > >>Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > >>Cc: Felipe Balbi <balbi@...com>
> > >>Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> > >
> > >Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > >
> > 
> > Thanks
> > 
> > >>---
> > >>  drivers/usb/isp1760/isp1760-udc.c | 2 +-
> > >>  1 file changed, 1 insertion(+), 1 deletion(-)
> > >>
> > >>Hi Laurent, Felipe,
> > >>
> > >>I am extremely sorry for missing this in my original patch.
> > >
> > >I hope you will be ashamed for the 7 generations to come for this totally
> > >unacceptable low quality standard.
> > >
> > 
> > Yes ;)
> 
> shameful indeed, doesn't build ;-)
> 
> drivers/usb/isp1760/isp1760-udc.c:1205:52: error: undefined identifier 'flags'
> drivers/usb/isp1760/isp1760-udc.c: In function ‘isp1760_udc_start’:
> drivers/usb/isp1760/isp1760-udc.c:1205:38: error: ‘flags’ undeclared (first use in this function)
>    spin_unlock_irqrestore(&udc->lock, flags);
>                                       ^
> drivers/usb/isp1760/isp1760-udc.c:1205:38: note: each undeclared identifier is reported only once for each function it appears in
> make[2]: *** [drivers/usb/isp1760/isp1760-udc.o] Error 1
> make[1]: *** [drivers/usb/isp1760] Error 2
> make[1]: *** Waiting for unfinished jobs....
> make: *** [drivers/usb/] Error 2

oh, nevermind, it depends on a previous fix :-)

-- 
balbi

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