From: Herbert Xu herbert@gondor.apana.org.au
[ Upstream commit 07928d9bfc81640bab36f5190e8725894d93b659 ]
The function padata_flush_queues is fundamentally broken because it cannot force padata users to complete the request that is underway. IOW padata has to passively wait for the completion of any outstanding work.
As it stands flushing is used in two places. Its use in padata_stop is simply unnecessary because nothing depends on the queues to be flushed afterwards.
The other use in padata_replace is more substantial as we depend on it to free the old pd structure. This patch instead uses the pd->refcnt to dynamically free the pd structure once all requests are complete.
Fixes: 2b73b07ab8a4 ("padata: Flush the padata queues actively") Cc: stable@vger.kernel.org Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Reviewed-by: Daniel Jordan daniel.m.jordan@oracle.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au [dj: leave "pd->pinst = pinst" assignment in padata_alloc_pd()] Signed-off-by: Daniel Jordan daniel.m.jordan@oracle.com --- kernel/padata.c | 45 ++++++++++++--------------------------------- 1 file changed, 12 insertions(+), 33 deletions(-)
diff --git a/kernel/padata.c b/kernel/padata.c index 63449fc584da..286c5142a0f7 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -34,6 +34,8 @@
#define MAX_OBJ_NUM 1000
+static void padata_free_pd(struct parallel_data *pd); + static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index) { int cpu, target_cpu; @@ -301,6 +303,7 @@ static void padata_serial_worker(struct work_struct *serial_work) struct padata_serial_queue *squeue; struct parallel_data *pd; LIST_HEAD(local_list); + int cnt;
local_bh_disable(); squeue = container_of(serial_work, struct padata_serial_queue, work); @@ -310,6 +313,8 @@ static void padata_serial_worker(struct work_struct *serial_work) list_replace_init(&squeue->serial.list, &local_list); spin_unlock(&squeue->serial.lock);
+ cnt = 0; + while (!list_empty(&local_list)) { struct padata_priv *padata;
@@ -319,9 +324,12 @@ static void padata_serial_worker(struct work_struct *serial_work) list_del_init(&padata->list);
padata->serial(padata); - atomic_dec(&pd->refcnt); + cnt++; } local_bh_enable(); + + if (atomic_sub_and_test(cnt, &pd->refcnt)) + padata_free_pd(pd); }
/** @@ -444,7 +452,7 @@ static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst, setup_timer(&pd->timer, padata_reorder_timer, (unsigned long)pd); atomic_set(&pd->seq_nr, -1); atomic_set(&pd->reorder_objects, 0); - atomic_set(&pd->refcnt, 0); + atomic_set(&pd->refcnt, 1); pd->pinst = pinst; spin_lock_init(&pd->lock);
@@ -469,31 +477,6 @@ static void padata_free_pd(struct parallel_data *pd) kfree(pd); }
-/* Flush all objects out of the padata queues. */ -static void padata_flush_queues(struct parallel_data *pd) -{ - int cpu; - struct padata_parallel_queue *pqueue; - struct padata_serial_queue *squeue; - - for_each_cpu(cpu, pd->cpumask.pcpu) { - pqueue = per_cpu_ptr(pd->pqueue, cpu); - flush_work(&pqueue->work); - } - - del_timer_sync(&pd->timer); - - if (atomic_read(&pd->reorder_objects)) - padata_reorder(pd); - - for_each_cpu(cpu, pd->cpumask.cbcpu) { - squeue = per_cpu_ptr(pd->squeue, cpu); - flush_work(&squeue->work); - } - - BUG_ON(atomic_read(&pd->refcnt) != 0); -} - static void __padata_start(struct padata_instance *pinst) { pinst->flags |= PADATA_INIT; @@ -507,10 +490,6 @@ static void __padata_stop(struct padata_instance *pinst) pinst->flags &= ~PADATA_INIT;
synchronize_rcu(); - - get_online_cpus(); - padata_flush_queues(pinst->pd); - put_online_cpus(); }
/* Replace the internal control structure with a new one. */ @@ -531,8 +510,8 @@ static void padata_replace(struct padata_instance *pinst, if (!cpumask_equal(pd_old->cpumask.cbcpu, pd_new->cpumask.cbcpu)) notification_mask |= PADATA_CPU_SERIAL;
- padata_flush_queues(pd_old); - padata_free_pd(pd_old); + if (atomic_dec_and_test(&pd_old->refcnt)) + padata_free_pd(pd_old);
if (notification_mask) blocking_notifier_call_chain(&pinst->cpumask_change_notifier,