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authorPJ Waskiewicz <peter.p.waskiewicz.jr@intel.com>2008-04-28 11:56:22 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2008-05-01 14:44:39 -0700
commitfa455bcd0a6460ef6543ebb212940fedf9f3170f (patch)
parent6ba675d46b278f478a22639b1c25b1476afcc351 (diff)
x86: Fix 32-bit x86 MSI-X allocation leakage
commit 9d9ad4b51d2b29b5bbeb4011f5e76f7538119cf9 upstream This bug was introduced in the 2.6.24 lguest 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@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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 4ca548632c8d..f239b302e9ff 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)
spin_lock_irqsave(&vector_lock, flags);
+ clear_bit(irq_vector[irq], used_vectors);
irq_vector[irq] = 0;
spin_unlock_irqrestore(&vector_lock, flags);