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linux-uconsole/kernel/irq
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Thomas Gleixner fae08fb3f9 genirq: Force MSI irq handlers to run with interrupts disabled 
commit 753649dbc4 upstream.

Network folks reported that directing all MSI-X vectors of their multi
queue NICs to a single core can cause interrupt stack overflows when
enough interrupts fire at the same time.

This is caused by the fact that we run interrupt handlers by default
with interrupts enabled unless the driver reuqests the interrupt with
the IRQF_DISABLED set. The NIC handlers do not set this flag, so
simultaneous interrupts can nest unlimited and cause the stack
overflow.

The only safe counter measure is to run the interrupt handlers with
interrupts disabled. We can't switch to this mode in general right
now, but it is safe to do so for MSI interrupts.

Force IRQF_DISABLED for MSI interrupt handlers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Linus Torvalds <torvalds@osdl.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: David Miller <davem@davemloft.net>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-04-26 07:41:18 -07:00
..
autoprobe.c async: Asynchronous function calls to speed up kernel boot 2009-01-07 08:45:46 -08:00
chip.c x86: Avoid race condition in pci_enable_msix() 2010-03-15 08:50:06 -07:00
devres.c genirq: add support for threaded interrupts to devres 2009-03-24 12:15:23 +01:00
handle.c headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
internals.h genirq: Add buslock support 2009-08-17 10:54:05 +02:00
Makefile x86/irq: use move_irq_desc() in create_irq_nr() 2009-05-01 19:01:12 +02:00
manage.c genirq: Force MSI irq handlers to run with interrupts disabled 2010-04-26 07:41:18 -07:00
migration.c genirq: Delegate irq affinity setting to the irq thread 2009-07-21 14:35:07 +02:00
numa_migrate.c x86/irq: Fix move_irq_desc() for nodes without ram 2009-08-08 17:06:03 +02:00
pm.c genirq: Fix comment describing suspend_device_irqs() 2009-07-05 13:07:00 +02:00
proc.c cpumask: update irq_desc to use cpumask_var_t 2009-01-11 19:12:46 +01:00
resend.c irq: Remove superfluous NULL pointer check in check_irq_resend() 2009-08-09 12:44:29 +02:00
spurious.c genirq: try_one_irq() must be called with irq disabled 2009-11-07 21:44:45 +01:00