call_function_many: fix list delete vs add race

Peter pointed out there was nothing preventing the list_del_rcu in
smp_call_function_interrupt from running before the list_add_rcu in
smp_call_function_many.

Fix this by not setting refs until we have gotten the lock for the list.
Take advantage of the wmb in list_add_rcu to save an explicit additional
one.

I tried to force this race with a udelay before the lock & list_add and
by mixing all 64 online cpus with just 3 random cpus in the mask, but
was unsuccessful.  Still, inspection shows a valid race, and the fix is
a extension of the existing protection window in the current code.

Cc: stable@kernel.org (v2.6.32 and later)
Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 7 deletions

diff --git a/kernel/smp.c b/kernel/smp.c
index 9910744f0856..aaeee20c5634 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -491,14 +491,15 @@ void smp_call_function_many(const struct cpumask *mask,
         cpumask_clear_cpu(this_cpu, data->cpumask);
 
         /*
-         * To ensure the interrupt handler gets an complete view
-         * we order the cpumask and refs writes and order the read
-         * of them in the interrupt handler.  In addition we may
-         * only clear our own cpu bit from the mask.
+         * We reuse the call function data without waiting for any grace
+         * period after some other cpu removes it from the global queue.
+         * This means a cpu might find our data block as it is writen.
+         * The interrupt handler waits until it sees refs filled out
+         * while its cpu mask bit is set; here we may only clear our
+         * own cpu mask bit, and must wait to set refs until we are sure
+         * previous writes are complete and we have obtained the lock to
+         * add the element to the queue.
          */
-        smp_wmb();
-
-        atomic_set(&data->refs, cpumask_weight(data->cpumask));
 
         raw_spin_lock_irqsave(&call_function.lock, flags);
         /*
@@ -507,6 +508,11 @@ void smp_call_function_many(const struct cpumask *mask,
          * will not miss any other list entries:
          */
         list_add_rcu(&data->csd.list, &call_function.queue);
+        /*
+         * We rely on the wmb() in list_add_rcu to order the writes
+         * to func, data, and cpumask before this write to refs.
+         */
+        atomic_set(&data->refs, cpumask_weight(data->cpumask));
         raw_spin_unlock_irqrestore(&call_function.lock, flags);
 
         /*