linux-kernel - Re: [Alsa-devel] [PATCH] Driver core: Don't ignore error returns from probing

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Date:	Fri, 6 Oct 2006 11:41:05 +0200 (CEST)
From:	Jaroslav Kysela <perex@...e.cz>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Andrew Morton <akpm@...l.org>,
	ALSA development <alsa-devel@...a-project.org>,
	Takashi Iwai <tiwai@...e.de>, Greg KH <gregkh@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Kosina <jikos@...os.cz>,
	Castet Matthieu <castet.matthieu@...e.fr>
Subject: Re: [Alsa-devel] [PATCH] Driver core: Don't ignore error returns
 from probing

On Fri, 6 Oct 2006, Cornelia Huck wrote:

> On Thu, 5 Oct 2006 17:03:24 -0400 (EDT),
> Alan Stern <stern@...land.harvard.edu> wrote:
> 
> > Index: 18g20/drivers/base/bus.c
> > ===================================================================
> > --- 18g20.orig/drivers/base/bus.c
> > +++ 18g20/drivers/base/bus.c
> > @@ -453,8 +453,10 @@ void bus_remove_device(struct device * d
> >  		remove_deprecated_bus_links(dev);
> >  		sysfs_remove_link(&dev->bus->devices.kobj, dev->bus_id);
> >  		device_remove_attrs(dev->bus, dev);
> > -		dev->is_registered = 0;
> > -		klist_del(&dev->knode_bus);
> > +		if (dev->is_registered) {
> > +			dev->is_registered = 0;
> > +			klist_del(&dev->knode_bus);
> > +		}
> >  		pr_debug("bus %s: remove device %s\n", dev->bus->name, dev->bus_id);
> >  		device_release_driver(dev);
> >  		put_bus(dev->bus);
> > Index: 18g20/drivers/base/core.c
> > ===================================================================
> > --- 18g20.orig/drivers/base/core.c
> > +++ 18g20/drivers/base/core.c
> > @@ -485,7 +485,8 @@ int device_add(struct device *dev)
> >  	if ((error = bus_add_device(dev)))
> >  		goto BusError;
> >  	kobject_uevent(&dev->kobj, KOBJ_ADD);
> > -	bus_attach_device(dev);
> > +	if ((error = bus_attach_device(dev)))
> > +		goto AttachError;
> >  	if (parent)
> >  		klist_add_tail(&dev->knode_parent, &parent->klist_children);
> >  
> > @@ -504,6 +505,8 @@ int device_add(struct device *dev)
> >   	kfree(class_name);
> >  	put_device(dev);
> >  	return error;
> > + AttachError:
> > +	bus_remove_device(dev);
> >   BusError:
> >  	device_pm_remove(dev);
> >   PMError:
> 
> Hm, I don't think we should call device_release_driver if
> bus_attach_device failed (and I think calling bus_remove_device if
> bus_attach_device failed is unintuitive). I did a patch that added a
> function which undid just the things bus_add_device did (here:
> http://marc.theaimsgroup.com/?l=linux-kernel&m=115816560424389&w=2),
> which unfortunately got lost somewhere... (I'll rebase and resend.)

Yes, but it might be better to check dev->is_registered flag in 
bus_remove_device() before device_release_driver() call to save some code, 
rather than reuse most of code in bus_delete_device().

						Jaroslav

-----
Jaroslav Kysela <perex@...e.cz>
Linux Kernel Sound Maintainer
ALSA Project, SUSE Labs
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