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    Subject[03/12] x86: Fix 32-bit x86 MSI-X allocation leakage
    2.6.24-stable review patch.  If anyone has any objections, please let us


    From: PJ Waskiewicz <>

    commit 9d9ad4b51d2b29b5bbeb4011f5e76f7538119cf9 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 <>
    Signed-off-by: Greg Kroah-Hartman <>

    arch/x86/kernel/io_apic_32.c | 1 +
    1 file changed, 1 insertion(+)

    --- 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);

     \ /
      Last update: 2008-04-29 20:55    [W:0.021 / U:7.232 seconds]
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