linux-kernel - Re: AGPGart / AMD K7

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Message-ID: <20070420232651.GB10949@kroah.com>
Date:	Fri, 20 Apr 2007 16:26:51 -0700
From:	Greg KH <greg@...ah.com>
To:	Dave Jones <davej@...hat.com>, "Preston A. Elder" <prez@...h.net>,
	linux-kernel@...r.kernel.org
Subject: Re: AGPGart / AMD K7

On Fri, Apr 20, 2007 at 03:00:28PM -0400, Dave Jones wrote:
> On Fri, Apr 20, 2007 at 11:29:52AM -0700, Greg Kroah-Hartman wrote:
>  > On Fri, Apr 20, 2007 at 02:20:29PM -0400, Dave Jones wrote:
>  > > 
>  > > btw Greg, wtf does driver_register return a 0 as 'success' if it
>  > > completes the function, and 0 as 'failure' if !bus ?
>  > > That seems doomed to failure.
>  > 
>  > I don't know why the code does that, we should always have a bus
>  > assigned to a driver.  I'll change that and watch to see what breaks :)
> 
> Maybe this?
> 
> We should always have a bus in bus_add_driver()
> Instead of returning success when we don't, BUG().

Nah, I don't like adding BUG() calls to the kernel if it can be helped,
how about the version I copied you on a few hours ago, which is also
below?

thanks,

greg k-h

------
From: Greg Kroah-Hartman <gregkh@...e.de>
Subject: driver core: bus_add_driver should return an error if no bus

As pointed out by Dave Jones.

Cc: Dave Jones <davej@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/base/bus.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -601,7 +601,7 @@ int bus_add_driver(struct device_driver 
 	int error = 0;
 
 	if (!bus)
-		return 0;
+		return -EINVAL;
 
 	pr_debug("bus %s: add driver %s\n", bus->name, drv->name);
 	error = kobject_set_name(&drv->kobj, "%s", drv->name);
-
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