genirq: Prevent resend to interrupts marked IRQ_NESTED_THREAD

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commit 75a06189fc upstream.

The resend mechanism happily calls the interrupt handler of interrupts
which are marked IRQ_NESTED_THREAD from softirq context. This can
result in crashes because the interrupt handler is not the proper way
to invoke the device handlers. They must be invoked via
handle_nested_irq.

Prevent the resend even if the interrupt has no valid parent irq
set. Its better to have a lost interrupt than a crashing machine.

Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

This commit is contained in:

Thomas Gleixner 2015-07-16 14:10:17 +02:00 • committed by Luis Henriques

parent fd6139cf4a

commit 605cb392a3

1 changed files with 13 additions and 5 deletions

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kernel/irq/resend.c

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