Re: PATCH: 2.6.26-rc8: Fix IRQF_DISABLED for shared interrupts

[David Brownell]

On Monday 30 June 2008, Stefan Becker wrote:
> It seems IRQF_SHARED | IRQF_DISABLED has already been discussed several 
> times on LKML:

Given that, I'm surprised that nobody has added a warning that
prints when those two flags are both passed to request_irq().

The problems have been around for a long time, "tested" and known
to be broken.  They'll never go away without nag messages nudging
developers to fix the problems.


> Alan: should I try to implement his choice (f) insteadn, i.e. drop 
> IRQF_DISABLED from USB HCD interrupts and disable interrupts in 
> usb_hcd_irq() instead?

That's the best solution for USB, given that IRQF_DISABLED isn't
going to do what it claims to do.

- Dave


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