4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Guenter Roeck linux@roeck-us.net
[ Upstream commit 11bca0a83f83f6093d816295668e74ef24595944 ]
An interrupt storm on a bad interrupt will cause the kernel log to be clogged.
[ 60.089234] ->handle_irq(): ffffffffbe2f803f, [ 60.090455] 0xffffffffbf2af380 [ 60.090510] handle_bad_irq+0x0/0x2e5 [ 60.090522] ->irq_data.chip(): ffffffffbf2af380, [ 60.090553] IRQ_NOPROBE set [ 60.090584] ->handle_irq(): ffffffffbe2f803f, [ 60.090590] handle_bad_irq+0x0/0x2e5 [ 60.090596] ->irq_data.chip(): ffffffffbf2af380, [ 60.090602] 0xffffffffbf2af380 [ 60.090608] ->action(): (null) [ 60.090779] handle_bad_irq+0x0/0x2e5
This was seen when running an upstream kernel on Acer Chromebook R11. The system was unstable as result.
Guard the log message with __printk_ratelimit to reduce the impact. This won't prevent the interrupt storm from happening, but at least the system remains stable.
Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: Dmitry Torokhov dtor@chromium.org Cc: Joe Perches joe@perches.com Cc: Andy Shevchenko andriy.shevchenko@linux.intel.com Cc: Mika Westerberg mika.westerberg@linux.intel.com Link: https://bugzilla.kernel.org/show_bug.cgi?id=197953 Link: https://lkml.kernel.org/r/1512234784-21038-1-git-send-email-linux@roeck-us.n... Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/irq/debug.h | 5 +++++ 1 file changed, 5 insertions(+)
--- a/kernel/irq/debug.h +++ b/kernel/irq/debug.h @@ -11,6 +11,11 @@
static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc) { + static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5); + + if (!__ratelimit(&ratelimit)) + return; + printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n", irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled); printk("->handle_irq(): %p, ", desc->handle_irq);