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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull irq fix from Thomas Gleixner:
 "A single bugfix for the irq core to prevent silent data corruption and
  malfunction of threaded interrupts under certain conditions"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq: Make force irq threading setup more robust
This commit is contained in:
Linus Torvalds 2018-08-05 08:55:26 -07:00
parent 212dab0541 d1f0301b33
commit b9fb1fc7f9
1 changed files with 8 additions and 1 deletions
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9
kernel/irq/manage.c
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@ -1068,6 +1068,13 @@ static int irq_setup_forced_threading(struct irqaction *new)
if (new->flags & (IRQF_NO_THREAD | IRQF_PERCPU | IRQF_ONESHOT))
return 0;
/*
* No further action required for interrupts which are requested as
* threaded interrupts already
*/
if (new->handler == irq_default_primary_handler)
return 0;
new->flags |= IRQF_ONESHOT;
/*
@ -1075,7 +1082,7 @@ static int irq_setup_forced_threading(struct irqaction *new)
* thread handler. We force thread them as well by creating a
* secondary action.
*/
if (new->handler != irq_default_primary_handler && new->thread_fn) {
if (new->handler && new->thread_fn) {
/* Allocate the secondary action */
new->secondary = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
if (!new->secondary)