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[ARM] fix drivers/mfd/ucb1x00-core.c IRQ probing bug 

While reviewing the IRQ autoprobing code i found the attached buglet.
probe_irq_on()/off() calls must always be in pairs, because the generic IRQ
code uses a global semaphore to serialize all autoprobing activites.
(which does make sense) The ARM code's probe_irq_*() implementation does
not do this, but if this driver is ever used on another platform, this bug
might bite.

(It probably does not trigger in practice, because a zero probing mask
returned should be rare - but still.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ingo Molnar 2006-06-26 15:26:13 +01:00 committed by Russell King
parent cd701aa27e
commit cfc736564f
1 changed files with 3 additions and 1 deletions
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4
drivers/mfd/ucb1x00-core.c
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@ -420,8 +420,10 @@ static int ucb1x00_detect_irq(struct ucb1x00 *ucb)
unsigned long mask; unsigned long mask;
mask = probe_irq_on(); mask = probe_irq_on();
if (!mask) if (!mask) {
probe_irq_off(mask);
return NO_IRQ; return NO_IRQ;
}
/* /*
* Enable the ADC interrupt. * Enable the ADC interrupt.