From: PJ Waskiewicz Date: Sat, 26 Apr 2008 00:58:52 +0000 (-0700) Subject: x86: Fix 32-bit MSI-X allocation leakage X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=9d9ad4b51d2b29b5bbeb4011f5e76f7538119cf9;p=deliverable%2Flinux.git x86: Fix 32-bit 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. I am generating the same patch for both stable trees for 2.6.24 and 2.6.25. Signed-off-by: Peter P Waskiewicz Jr Signed-off-by: Linus Torvalds --- diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c index 696b8e4e66bb..a40d54fc1fdd 100644 --- a/arch/x86/kernel/io_apic_32.c +++ b/arch/x86/kernel/io_apic_32.c @@ -2444,6 +2444,7 @@ 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); }