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authorIngo Molnar <mingo@elte.hu>2006-06-26 18:26:13 +0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-06-26 18:26:13 +0400
commitcfc736564fd01ee008d746913b1bbb90e3eb1f99 (patch)
tree6192a27c1ace4bf76795dadadbe1eb63cbe47429 /drivers/mfd
parentcd701aa27e4cfab5c99c7da13d404b1f3a0aecfb (diff)
downloadlinux-cfc736564fd01ee008d746913b1bbb90e3eb1f99.tar.xz
[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>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/ucb1x00-core.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/mfd/ucb1x00-core.c b/drivers/mfd/ucb1x00-core.c
index aff83f966803..c8426a9bf273 100644
--- a/drivers/mfd/ucb1x00-core.c
+++ b/drivers/mfd/ucb1x00-core.c
@@ -420,8 +420,10 @@ static int ucb1x00_detect_irq(struct ucb1x00 *ucb)
unsigned long mask;
mask = probe_irq_on();
- if (!mask)
+ if (!mask) {
+ probe_irq_off(mask);
return NO_IRQ;
+ }
/*
* Enable the ADC interrupt.