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| author | Thomas Gleixner <tglx@linutronix.de> | 2017-11-12 13:02:51 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-11-12 13:15:14 +0100 |
| commit | d00a08cf9ee986ad6689ce8c6fd176aff679c106 (patch) | |
| tree | ad39bb22f22d5613e7c40b5e39552c334192dd46 | |
| parent | 9dc505d6df5c607a4ea088b5f1907540079a9859 (diff) | |
| download | linux-d00a08cf9ee986ad6689ce8c6fd176aff679c106.tar.gz linux-d00a08cf9ee986ad6689ce8c6fd176aff679c106.tar.bz2 linux-d00a08cf9ee986ad6689ce8c6fd176aff679c106.zip | |
irq/work: Use llist_for_each_entry_safe
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: 16c0890dc66d ("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
| -rw-r--r-- | kernel/irq_work.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/irq_work.c b/kernel/irq_work.c index e2ebe8c71e8f..6647b33f7eb0 100644 --- a/kernel/irq_work.c +++ b/kernel/irq_work.c @@ -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. |