linux-kernel - RE: [PATCH 8/8] ARM: tegra: HACK: remove set_irq

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Message-ID: <74CDBE0F657A3D45AFBB94109FB122FF17BE86173C@HQMAIL01.nvidia.com>
Date:	Thu, 1 Mar 2012 12:29:43 -0800
From:	Stephen Warren <swarren@...dia.com>
To:	Alan Ott <alan@...nal11.us>, Russell King <linux@....linux.org.uk>,
	Colin Cross <ccross@...roid.com>,
	Olof Johansson <olof@...om.net>,
	Grant Likely <grant.likely@...retlab.ca>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
CC:	Arnd Bergmann <arnd@...db.de>
Subject: RE: [PATCH 8/8] ARM: tegra: HACK: remove set_irq_flags() from driver

Alan Ott wrote at Thursday, March 01, 2012 12:27 PM:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The driver should not call set_irq_flags itself, and

Probably true in this case.

> cannot do this from a loadable module.

I hope that's not true; grep'ing the entire of drivers/ shows a bunch
of drivers calling this function, and many look like they'd be reasonable
as module.

>From what little I understand of this, any irq_chip is going to call
that function after setting up any child/cascaded IRQs, and I assume
that irq_chips can be in modules.

> Remove the call for now, which might break the driver
> but at least lets the kernel link again.

The driver appears to work fine with this removed. At least, on Tegra20
Harmony, I was able to modprobe ehci-hcd and then use the USB Ethernet
controller for DHCP and SSH.

So,

Tested-by: Stephen Warren <swarren@...dia.com>

-- 
nvpublic

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