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| author | Thomas Gleixner <tglx@linutronix.de> | 2008-02-18 18:25:17 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-02-19 10:43:58 +0100 |
| commit | 89d694b9dbe769ca1004e01db0ca43964806a611 (patch) | |
| tree | b8fd51348034a4b09547ea0137d4ac467f6987fa /kernel | |
| parent | 188fd89d539d899bfca2bc83534e5508e0161139 (diff) | |
| download | linux-89d694b9dbe769ca1004e01db0ca43964806a611.tar.gz linux-89d694b9dbe769ca1004e01db0ca43964806a611.tar.bz2 linux-89d694b9dbe769ca1004e01db0ca43964806a611.zip | |
genirq: do not leave interupts enabled on free_irq
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.
[@stable: affected versions: .21 - .24 ]
Pointed-out-by: Michael Hennerich <Michael.Hennerich@analog.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: stable@kernel.org
Tested-by: Michael Hennerich <Michael.Hennerich@analog.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/chip.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index cc54c6276356..fdb3fbe2b0c4 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) |