x86: revert irq number limitation

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>

diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index c9513e1ff28d3b79fd5fd5806cd41a0eb33a29c0..1fec0f9b1508cdc22f2cce5cfef9364cf4022b4f 100644 (file)
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -3608,27 +3608,7 @@ int __init io_apic_get_redir_entries (int ioapic)
 
 int __init probe_nr_irqs(void)
 {
-       int idx;
-       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;
+       return NR_IRQS;
 }
 
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