x86: Reserve FIRST_DEVICE_VECTOR in used_vectors bitmap.

Not in upstream above 2.6.27 due to change in the way this code works
(has been fixed differently there.)

Someone from the community found out, that after repeatedly unloading
and loading a device driver that uses MSI IRQs, the system eventually
assigned the vector initially reserved for IRQ0 to the device driver.

The reason for this is, that although IRQ0 is tied to the
FIRST_DEVICE_VECTOR when declaring the irq_vector table, the
corresponding bit in the used_vectors map is not set. So, if vectors are
released and assigned often enough, the vector will get assigned to
another interrupt. This happens more often with MSI interrupts as those
are exclusively using a vector.

Fix this by setting the bit for the FIRST_DEVICE_VECTOR in the bitmap.

Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index 09cddb57bec45e9ddd60ba376b3a70aca647ad8d..bfd9fc5d15561c31265ae1076acf4927aa80ac4c 100644 (file)
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -2314,6 +2314,9 @@ void __init setup_IO_APIC(void)
        for (i = first_system_vector; i < NR_VECTORS; i++)
                set_bit(i, used_vectors);
 
+       /* Mark FIRST_DEVICE_VECTOR which is assigned to IRQ0 as used. */
+       set_bit(FIRST_DEVICE_VECTOR, used_vectors);
+
        enable_IO_APIC();
 
        io_apic_irqs = ~PIC_IRQS;