linux-kernel - RE: [PATCH v3 1/2] usb: dwc2: gadget: sparse warning of context imbalance

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Date:	Fri, 17 Oct 2014 19:05:19 +0000
From:	Paul Zimmerman <Paul.Zimmerman@...opsys.com>
To:	"balbi@...com" <balbi@...com>
CC:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 1/2] usb: dwc2: gadget: sparse warning of context
 imbalance

> From: Felipe Balbi [mailto:balbi@...com]
> Sent: Friday, October 17, 2014 11:52 AM
> 
> On Fri, Oct 17, 2014 at 06:50:19PM +0000, Paul Zimmerman wrote:
> > > From: Sudip Mukherjee [mailto:sudipm.mukherjee@...il.com]
> > > Sent: Thursday, October 16, 2014 9:44 PM
> > >
> > > sparse was giving the following warning:
> > >         warning: context imbalance in 's3c_hsotg_ep_enable'
> > > 	                - different lock contexts for basic block
> > >
> > > we were returning ENOMEM while still holding the spinlock.
> > > The sparse warning was fixed by releasing the spinlock before return.
> > >
> > > Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> > > ---
> > >  drivers/usb/dwc2/gadget.c | 7 +++++--
> > >  1 file changed, 5 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
> > > index 7b5856f..7f25527 100644
> > > --- a/drivers/usb/dwc2/gadget.c
> > > +++ b/drivers/usb/dwc2/gadget.c
> > > @@ -2561,8 +2561,10 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep,
> > >  			hs_ep->fifo_size = val;
> > >  			break;
> > >  		}
> > > -		if (i == 8)
> > > -			return -ENOMEM;
> > > +		if (i == 8) {
> > > +			ret = -ENOMEM;
> > > +			goto error;
> > > +		}
> > >  	}
> > >
> > >  	/* for non control endpoints, set PID to D0 */
> > > @@ -2579,6 +2581,7 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep,
> > >  	/* enable the endpoint interrupt */
> > >  	s3c_hsotg_ctrl_epint(hsotg, index, dir_in, 1);
> > >
> > > +error:
> > >  	spin_unlock_irqrestore(&hsotg->lock, flags);
> > >  	return ret;
> > >  }
> >
> > Acked-by: Paul Zimmerman <paulz@...opsys.com>
> 
> v3.18-rc or v3.19 ?

v3.18-rc, since it's a bugfix. And I forgot, this should be marked for
3.17 stable too.

-- 
Paul

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