]> err.no Git - linux-2.6/commit
generic irqs: handle failure of irqchip->set_type in setup_irq
authorUwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
Thu, 24 Jul 2008 04:28:54 +0000 (21:28 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 24 Jul 2008 17:47:24 +0000 (10:47 -0700)
commit82736f4d1d2b7063b829cc93171a6e5aea8a9c49
tree3e0e7bf57638dcb1321496440a11623beb005458
parentf606ddf42fd4edc558eeb48bfee66d2c591571d2
generic irqs: handle failure of irqchip->set_type in setup_irq

set_type returns an int indicating success or failure, but up to now
setup_irq ignores that.

In my case this resulted in a machine hang:

gpio-keys requested IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, but
arm/ns9xxx can only trigger on one direction so set_type didn't touch
the configuration which happens do default to a level sensitiveness and
returned -EINVAL.  setup_irq ignored that and unmasked the irq.  This
resulted in an endless triggering of the gpio-key interrupt service
routine which effectively killed the machine.

With this patch applied setup_irq propagates the error to the caller.

Note that before in the case

chip && !chip->set_type && !chip->name

a NULL pointer was feed to printk.  This is fixed, too.

Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/irq/manage.c