linux-kernel - Re: [PATCH 14/14] nubus: Add support for the driver model

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Date:   Sun, 12 Nov 2017 14:52:32 +1100 (AEDT)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/14] nubus: Add support for the driver model

On Sat, 11 Nov 2017, Greg Kroah-Hartman wrote:

> On Sat, Nov 11, 2017 at 09:45:53AM +0100, Greg Kroah-Hartman wrote:
> > 
> > I can't take patches without any changelog text at all, that's not 
> > good engineering, sorry :(
> > 

I forgot to write it, sorry. I was going to explain the decision to leave 
the bus matching up to the driver.

> > Please fix up and resend and I will be glad to review.
> 
> Also, please test device removal, I don't think you did that :(
> 

The modprobe, rmmod, modprobe sequence was tested. But I think that isn't 
what you meant.

Are you saying there is a missing NULL check? That is,

 static int nubus_device_remove(struct device *dev)
 {
 	struct nubus_driver *ndrv = to_nubus_driver(dev->driver);
 	int err = -ENODEV;

-	if (ndrv->remove)
+	if (dev->driver && ndrv->remove)
 		err = ndrv->remove(to_nubus_board(dev));
 	return err;
 }

Anyway, I will revise the patch and test the unbind operation on a device 
not already bound.

Thanks for your feedback.

--