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Date: Fri, 25 Apr 2008 18:00:26 -0700 From: PJ Waskiewicz <peter.p.waskiewicz.jr@...el.com> To: stable@...nel.org, linux-kernel@...r.kernel.org Cc: netdev@...r.kernel.org Subject: [PATCH] ARCH 2.6.25.y: Fix 32-bit x86 MSI-X allocation leakage 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 <peter.p.waskiewicz.jr@...el.com> --- 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 4ca5486..f239b30 100644 --- a/arch/x86/kernel/io_apic_32.c +++ b/arch/x86/kernel/io_apic_32.c @@ -2477,6 +2477,7 @@ void destroy_irq(unsigned int irq) dynamic_irq_cleanup(irq); spin_lock_irqsave(&vector_lock, flags); + clear_bit(irq_vector[irq], used_vectors); irq_vector[irq] = 0; spin_unlock_irqrestore(&vector_lock, flags); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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