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x86: revert irq number limitation

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Impact: fix MSIx not enough irq numbers available regression

The manual revert of the sparse_irq patches missed to bring the number
of possible irqs back to the .27 status. This resulted in a regression
when two multichannel network cards were placed in a system with only
one IO_APIC - causing the networking driver to not have the right
IRQ and the device not coming up.

Remove the dynamic allocation logic leftovers and simply return
NR_IRQS in probe_nr_irqs() for now.

   Fixes: http://lkml.org/lkml/2008/11/19/354

Reported-by: Jesper Dangaard Brouer <hawk@diku.dk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Jesper Dangaard Brouer <hawk@diku.dk>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2008-11-21 11:16:48 -08:00 committed by Ingo Molnar
parent 57550b27ff
commit a1967d6441
1 changed files with 1 additions and 21 deletions
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22
arch/x86/kernel/io_apic.c
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@ -3608,27 +3608,7 @@ int __init io_apic_get_redir_entries (int ioapic)
int __init probe_nr_irqs(void) int __init probe_nr_irqs(void)
{ {
int idx; return NR_IRQS;
int nr = 0;
#ifndef CONFIG_XEN
int nr_min = 32;
#else
int nr_min = NR_IRQS;
#endif
for (idx = 0; idx < nr_ioapics; idx++)
nr += io_apic_get_redir_entries(idx) + 1;
/* double it for hotplug and msi and nmi */
nr <<= 1;
/* something wrong ? */
if (nr < nr_min)
nr = nr_min;
if (WARN_ON(nr > NR_IRQS))
nr = NR_IRQS;
return nr;
} }
/* -------------------------------------------------------------------------- /* --------------------------------------------------------------------------