linux-kernel - Re: [PATCH 2/8] prism2_usb.c always enable the card in probe

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Message-Id: <1225712877.3113.44.camel@castor.localdomain>
Date:	Mon, 03 Nov 2008 11:47:57 +0000
From:	Richard Kennedy <richard@....demon.co.uk>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	gregkh <gregkh@...e.de>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/8] prism2_usb.c always enable the card in probe_usb

On Mon, 2008-11-03 at 12:25 +0100, Oliver Neukum wrote:
> Am Montag, 3. November 2008 12:13:48 schrieb Richard Kennedy:
> > always enable card in probe_usb
> > & update register_wlandev to match latest wlan-ng-dev tree.
> 
> This breaks both error cases.
> 
> > ---
> >  drivers/staging/wlan-ng/prism2_usb.c |   14 +++++++++-----
> >  1 files changed, 9 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/staging/wlan-ng/prism2_usb.c b/drivers/staging/wlan-ng/prism2_usb.c
> > index f1ae371..34a36c1 100644
> > --- a/drivers/staging/wlan-ng/prism2_usb.c
> > +++ b/drivers/staging/wlan-ng/prism2_usb.c
> > @@ -110,11 +110,6 @@ static int prism2sta_probe_usb(
> >  	 * linux netdevice.
> >  	 */
> >  	SET_NETDEV_DEV(wlandev->netdev, &(interface->dev));
> > -        if ( register_wlandev(wlandev) != 0 ) {
> > -		WLAN_LOG_ERROR("%s: register_wlandev() failed.\n", dev_info);
> > -		result = -EIO;
> > -		goto failed;
> > -        }
> >  
> >  	/* Do a chip-level reset on the MAC */
> >  	if (prism2_doreset) {
> 
> 	/* Do a chip-level reset on the MAC */
> 	if (prism2_doreset) {
> 		result = hfa384x_corereset(hw,
> 				prism2_reset_holdtime,
> 				prism2_reset_settletime, 0);
> 		if (result != 0) {
> 			unregister_wlandev(wlandev);
> 
> You must remove the unregister_wlandev here.
> > @@ -138,6 +133,15 @@ static int prism2sta_probe_usb(
> >  
> >  	wlandev->msdstate = WLAN_MSD_HWPRESENT;
> >  
> > +        if ( register_wlandev(wlandev) != 0 ) {
> > +		WLAN_LOG_ERROR("%s: register_wlandev() failed.\n", dev_info);
> > +		result = -EIO;
> > +		goto failed;
> 
> "failed" fails to undo usb_get_dev() which it must do if you jump there
> from this late.
> 
> 	Regards
> 		Oliver

Oliver,
thanks for that, I will tidy it up & post a patch.

prism2_doreset is 0 by default, so that hunk of code will not usually
get called. hfa384x_corereset doesn't do much on usb, and holdtime &
settletime aren't used at all. So more targets for clean up I guess :)

regards
Richard


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