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

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Date:	Thu, 1 Mar 2012 21:33:03 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Alan Ott <alan@...nal11.us>
Cc:	Russell King <linux@....linux.org.uk>,
	Colin Cross <ccross@...roid.com>,
	Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dia.com>,
	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-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 8/8] ARM: tegra: HACK: remove set_irq_flags() from driver

On Thu, Mar 1, 2012 at 8:26 PM, Alan Ott <alan@...nal11.us> wrote:

> From: Arnd Bergmann <arnd@...db.de>
>
> The driver should not call set_irq_flags itself, and
> cannot do this from a loadable module.
>
> Remove the call for now, which might break the driver
> but at least lets the kernel link again.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/usb/host/ehci-tegra.c |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
> index dbc7fe8..ab91f26 100644
> --- a/drivers/usb/host/ehci-tegra.c
> +++ b/drivers/usb/host/ehci-tegra.c
> @@ -729,7 +729,6 @@ static int tegra_ehci_probe(struct platform_device *pdev)
>                err = -ENODEV;
>                goto fail;
>        }
> -       set_irq_flags(irq, IRQF_VALID);

The kernel is full of this kind of stuff (drivers/mfd/twl4030-irq.c):

#ifdef CONFIG_ARM
        /* ARM requires an extra step to clear IRQ_NOREQUEST, which it
         * sets on behalf of every irq_chip.  Also sets IRQ_NOPROBE.
         */
        set_irq_flags(irq, IRQF_VALID);
#else
        /* same effect on other architectures */
        irq_set_noprobe(irq);
#endif

Can't we try to fix this for real instead of breaking the universe,
hehe :-)

Yours,
Linus Walleij
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