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authorThomas Gleixner <tglx@linutronix.de>2008-02-20 00:29:02 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2008-02-25 16:18:58 -0800
commit0466e6b39901c5af878300cf43485ae581b252cb (patch)
tree99a7d8a639a219cc9b113fc0c020b411c66734aa
parent4813a83f2665f7276f1e4eee9cffe45116cf3824 (diff)
genirq: do not leave interupts enabled on free_irq
commit 89d694b9dbe769ca1004e01db0ca43964806a611 The default_disable() function was changed in commit: 76d2160147f43f982dfe881404cfde9fd0a9da21 genirq: do not mask interrupts by default It removed the mask function in favour of the default delayed interrupt disabling. Unfortunately this also broke the shutdown in free_irq() when the last handler is removed from the interrupt for those architectures which rely on the default implementations. Now we can end up with a enabled interrupt line after the last handler was removed, which can result in spurious interrupts. Fix this by adding a default_shutdown function, which is only installed, when the irqchip implementation does provide neither a shutdown nor a disable function. Pointed-out-by: Michael Hennerich <Michael.Hennerich@analog.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@elte.hu> Tested-by: Michael Hennerich <Michael.Hennerich@analog.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--kernel/irq/chip.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 44019ce30a14..465c69c2c97c 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -246,6 +246,17 @@ static unsigned int default_startup(unsigned int irq)
}
/*
+ * default shutdown function
+ */
+static void default_shutdown(unsigned int irq)
+{
+ struct irq_desc *desc = irq_desc + irq;
+
+ desc->chip->mask(irq);
+ desc->status |= IRQ_MASKED;
+}
+
+/*
* Fixup enable/disable function pointers
*/
void irq_chip_set_defaults(struct irq_chip *chip)
@@ -256,8 +267,15 @@ void irq_chip_set_defaults(struct irq_chip *chip)
chip->disable = default_disable;
if (!chip->startup)
chip->startup = default_startup;
+ /*
+ * We use chip->disable, when the user provided its own. When
+ * we have default_disable set for chip->disable, then we need
+ * to use default_shutdown, otherwise the irq line is not
+ * disabled on free_irq():
+ */
if (!chip->shutdown)
- chip->shutdown = chip->disable;
+ chip->shutdown = chip->disable != default_disable ?
+ chip->disable : default_shutdown;
if (!chip->name)
chip->name = chip->typename;
if (!chip->end)