On Wed, 20 May 2015, Jiang Liu wrote:
> On 2015/5/16 5:02, Thomas Gleixner wrote:
> > This is a bit odd. With your proposed change we'll have:
> >
> > alloc_legacy_irq()
> >
> > msi[x]_enable()
> > free_legacy_irq()
> >
> > msi[x]_disable()
> > alloc_legacy_irq()
> Hi Thomas,
> It's for safety. I'm not sure whether the device driver will
> make use of legacy IRQ after calling msi[x]_disable(). I have concerns
> about following pattern in PCI device drivers:
> ---------------------------------------------------
> if (enable_msi() == SUCCESS) {
> if (allocate_resource_for_msi() == SUCCESS)
> return;
> disable_msi();
> }
> use_legacy_irq()
Fair enough.
tglx
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