Resend now that this patch was merged into -upstream.

This bug was introduced in the 2.6.24 i386/x86_64 tree merge, where
MSI-X vector allocation will eventually fail. The cause is the new
bit array tracking used vectors is not getting cleared properly on
IRQ destruction on the 32-bit APIC code.

This can be seen easily using the ixgbe 10 GbE driver on multi-core
systems by simply loading and unloading the driver a few times.
Depending on the number of available vectors on the host system, the
MSI-X allocation will eventually fail, and the driver will only be
able to use legacy interrupts.

Signed-off-by: Peter P Waskiewicz Jr

arch/x86/kernel/io_apic_32.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index 232fdeb..9994c52 100644
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -2478,6 +2478,7 @@ void destroy_irq(unsigned int irq)

spin_lock_irqsave(&vector_lock, flags);
+ clear_bit(irq_vector[irq], used_vectors);
irq_vector[irq] = 0;
spin_unlock_irqrestore(&vector_lock, flags);

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