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irq/work: Use llist_for_each_entry_safe

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The llist_for_each_entry() loop in irq_work_run_list() is unsafe because
once the works PENDING bit is cleared it can be requeued on another CPU.

Use llist_for_each_entry_safe() instead.

Fixes: 16c0890dc6 ("irq/work: Don't reinvent the wheel but use existing llist API")
Reported-by:Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: Byungchul Park <byungchul.park@lge.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petri Latvala <petri.latvala@intel.com>
Link: http://lkml.kernel.org/r/151027307351.14762.4611888896020658384@mail.alporthouse.com
This commit is contained in:
Thomas Gleixner 2017-11-12 13:02:51 +01:00
parent 9dc505d6df
commit d00a08cf9e
1 changed files with 3 additions and 3 deletions
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6
kernel/irq_work.c
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@ -128,9 +128,9 @@ bool irq_work_needs_cpu(void)
static void irq_work_run_list(struct llist_head *list)
{
unsigned long flags;
struct irq_work *work;
struct irq_work *work, *tmp;
struct llist_node *llnode;
unsigned long flags;
BUG_ON(!irqs_disabled());
@ -138,7 +138,7 @@ static void irq_work_run_list(struct llist_head *list)
return;
llnode = llist_del_all(list);
llist_for_each_entry(work, llnode, llnode) {
llist_for_each_entry_safe(work, tmp, llnode, llnode) {
/*
* Clear the PENDING bit, after this point the @work
* can be re-used.