linux-kernel - Re: [PATCH v3 4/7] USB: EHCI: export ehci

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Date:	Fri, 29 Mar 2013 15:56:58 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Arnd Bergmann <arnd@...db.de>
cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Geoff Levand <geoff@...radead.org>,
	Stephen Warren <swarren@...dia.com>,
	Venu Byravarasu <vbyravarasu@...dia.com>,
	USB list <linux-usb@...r.kernel.org>,
	Manjunath Goudar <manjunath.goudar@...aro.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>
Subject: Re: [PATCH v3 4/7] USB: EHCI: export ehci_shutdown

On Thu, 28 Mar 2013, Arnd Bergmann wrote:

> The ehci_shutdown function is used by the platform specific ehci backends
> for at91, tegra and ps3. In order to turn any of these into separate
> modules, we need to make this function globally visible and export it.

Actually, I think this is not necessary.  Instead those three glue
files ought to be changed.  They should not need to call
ehci_shutdown() directly.

The references to ehci_shutdown() in ehci-atmel.c and ehci-ps3.c seem
totally unnecesary.  That routine does a hard shutdown -- but the calls
are immediately followed by usb_remove_hcd(), which calls ehci_stop(),
which does an orderly shutdown followed by a reset.  While it certainly
would be good to check with the authors of these drivers, it would be
surprising if removing those calls led to any trouble.

The reference in ehci-tegra.c is there only so that
tegra_ehci_shutdown() can call tegra_ehci_power_up() before doing its
real work.  Instead, tegra_ehci_power_up() should be called by 
tegra_ehci_hcd_shutdown().  Then there would be no need to have the 
tegra_ehci_shutdown() routine at all.

Alan Stern

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