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authorLinus Torvalds <torvalds@linux-foundation.org>2016-01-08 13:46:59 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-08 13:46:59 -0800
commitea83ae2fb30cd134d0220221bcf81efb579f8d73 (patch)
treed010700406f9a72d6d4bf7059e72ccc7499bbaa0
parenta6a7358e495e7e687938359b4747aafa63c31416 (diff)
parentabc7e40c81d113ef4bacb556f0a77ca63ac81d85 (diff)
downloadleg-kernel-ea83ae2fb30cd134d0220221bcf81efb579f8d73.tar.gz
Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq fix from Ingo Molnar: "Fixes a core IRQ subsystem deadlock" * 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: genirq: Prevent chip buslock deadlock
-rw-r--r--kernel/irq/manage.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 0eebaeef317b..6ead200370da 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1434,6 +1434,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
if (!desc)
return NULL;
+ chip_bus_lock(desc);
raw_spin_lock_irqsave(&desc->lock, flags);
/*
@@ -1447,7 +1448,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
if (!action) {
WARN(1, "Trying to free already-free IRQ %d\n", irq);
raw_spin_unlock_irqrestore(&desc->lock, flags);
-
+ chip_bus_sync_unlock(desc);
return NULL;
}
@@ -1475,6 +1476,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
#endif
raw_spin_unlock_irqrestore(&desc->lock, flags);
+ chip_bus_sync_unlock(desc);
unregister_handler_proc(irq, action);
@@ -1553,9 +1555,7 @@ void free_irq(unsigned int irq, void *dev_id)
desc->affinity_notify = NULL;
#endif
- chip_bus_lock(desc);
kfree(__free_irq(irq, dev_id));
- chip_bus_sync_unlock(desc);
}
EXPORT_SYMBOL(free_irq);