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handle_prio_irq is almost identical with handle_fasteoi_irq. The subtle differences are 1) The handler checks for IRQ_DISABLED after the device handler has been called. In case it's set it masks the interrupt. 2) When the handler sees IRQ_DISABLED on entry it masks the interupt in the same way as handle_fastoei_irq, but does not set the IRQ_PENDING flag. 3) Instead of gracefully handling a recursive interrupt it crashes the kernel. #1 is just relevant when a device handler calls disable_irq_nosync() and it does not matter whether we mask the interrupt right away or not. We handle lazy masking for disable_irq anyway, so there is no real reason to have this extra mask in place. #2 will prevent the resend of a pending interrupt, which can result in lost interrupts for edge type interrupts. For level type interrupts the resend is a noop in the generic code. According to the datasheet all interrupts are level type, so marking them as such will result in the exact same behaviour as the private handle_prio_irq implementation. #3 is just stupid. Crashing the kernel instead of handling a problem gracefully is just wrong. With the current semantics- all handlers run with interrupts disabled - this is even more wrong. Rename ack to eoi, remove the unused mask_ack, switch to handle_fasteoi_irq and remove the private function. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Acked-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> Cc: linux-arm-kernel@lists.infradead.org LKML-Reference: <20110202212552.299898447@linutronix.de> |
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| .. | ||
| include/mach | ||
| board-a9m9750dev.c | ||
| board-a9m9750dev.h | ||
| board-jscc9p9360.c | ||
| board-jscc9p9360.h | ||
| clock.c | ||
| clock.h | ||
| generic.c | ||
| generic.h | ||
| gpio-ns9360.c | ||
| gpio-ns9360.h | ||
| gpio.c | ||
| irq.c | ||
| Kconfig | ||
| mach-cc9p9360dev.c | ||
| mach-cc9p9360js.c | ||
| Makefile | ||
| Makefile.boot | ||
| plat-serial8250.c | ||
| processor-ns9360.c | ||
| time-ns9360.c | ||