Commit-ID: d00a08cf9ee986ad6689ce8c6fd176aff679c106
Gitweb: https://git.kernel.org/tip/d00a08cf9ee986ad6689ce8c6fd176aff679c106
Author: Thomas Gleixner <t...@linutronix.de>
AuthorDate: Sun, 12 Nov 2017 13:02:51 +0100
Committer: Thomas Gleixner <t...@linutronix.de>
CommitDate: Sun, 12 Nov 2017 13:15:14 +0100
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 <ch...@chris-wilson.co.uk>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Cc: Frederic Weisbecker <frede...@kernel.org>
Cc: Byungchul Park <byungchul.p...@lge.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Petri Latvala <petri.latv...@intel.com>
Link:
http://lkml.kernel.org/r/151027307351.14762.4611888896020658...@mail.alporthouse.com
---
kernel/irq_work.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index e2ebe8c..6647b33f 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.
