Herbert Xu a98ce5c6fe Fix synchronize_irq races with IRQ handler ... As it is some callers of synchronize_irq rely on memory barriers to provide synchronisation against the IRQ handlers. For example, the tg3 driver does tp->irq_sync = 1; smp_mb(); synchronize_irq(); and then in the IRQ handler: if (!tp->irq_sync) netif_rx_schedule(dev, &tp->napi); Unfortunately memory barriers only work well when they come in pairs. Because we don't actually have memory barriers on the IRQ path, the memory barrier before the synchronize_irq() doesn't actually protect us. In particular, synchronize_irq() may return followed by the result of netif_rx_schedule being made visible. This patch (mostly written by Linus) fixes this by using spin locks instead of memory barries on the synchronize_irq() path. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2007-10-23 09:01:31 -07:00
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autoprobe.c
chip.c	Compile handle_percpu_irq even for uniprocessor kernels	2007-10-17 08:43:00 -07:00
devres.c	rip some includes from linux/interrupt.h	2007-07-28 19:42:22 -07:00
handle.c
internals.h
Makefile
manage.c	Fix synchronize_irq races with IRQ handler	2007-10-23 09:01:31 -07:00
migration.c
proc.c	x86_64: Report the pending irq if available in smp_affinity	2007-07-21 18:37:07 -07:00
resend.c	genirq: suppress resend of level interrupts	2007-08-12 11:05:45 -07:00
spurious.c