linux-kernel - Re: [linux-usb-devel] [PATCH] Properly unregister reboot notifier in case of failure in ehci hcd

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Message-ID: <20060731193544.71481.qmail@web81206.mail.mud.yahoo.com>
Date:	Mon, 31 Jul 2006 12:35:44 -0700 (PDT)
From:	Aleksey Gorelov <dared1st@...oo.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	David Brownell <david-b@...bell.net>,
	linux-usb-devel@...ts.sourceforge.net,
	Andrew Morton <akpm@...l.org>, gregkh@...e.de,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-usb-devel] [PATCH] Properly unregister reboot notifier in case of failure in ehci hcd

--- Alan Stern <stern@...land.harvard.edu> wrote:

> On Mon, 31 Jul 2006, Aleksey Gorelov wrote:
> 
> > > Why do you need to change the bus glue?  Wouldn't it be a lot simpler just 
> > > to add ehci_shutdown as a member of ehci_pci_driver, for instance, with 
> > > similar changes to ehci_hcd_au1xxx_driver and ehci_hcd_fsl_driver?
> > > 
> > > Alan Stern
> > 
> >   This avoids code duplication for common for both ehci and ohci code
> 
> What code duplication?  Doing it the way I suggested doesn't require 
> adding any new code at all.  You, on the other hand, added several 
> routines for bus glue that does virtually nothing.

  But you can not use exactly same shutdown function with both pci and platform glue. You need to
convert pci/platform device to hcd anyway, right ? So this will add 2 doing 'virtually nothing'
routines anyway (unless you just want to duplicate the code of shutdown routine for for platform
glue). For ohci, you would need to do the same, hence 2 more routines, 4 total. With bus glue, I
added just 2. Am I missing something here ?

> 
> > (and possibly for uhci, but
> > it currently does not have any notifier/shutdown handler),
> 
> Yes it does.  From uhci-hcd.c:

My bad. I did not find notifier, but shutdown handler is indeed there. However, uhci is different
in a way it does not use platform driver.

Aleks.
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