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path: root/drivers/s390/cio/css.c
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Diffstat (limited to 'drivers/s390/cio/css.c')
-rw-r--r--drivers/s390/cio/css.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 95805da2bb2..59c4b94cdb4 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -409,10 +409,14 @@ static void css_evaluate_subchannel(struct subchannel_id schid, int slow)
static struct idset *slow_subchannel_set;
static spinlock_t slow_subchannel_lock;
+static wait_queue_head_t css_eval_wq;
+static atomic_t css_eval_scheduled;
static int __init slow_subchannel_init(void)
{
spin_lock_init(&slow_subchannel_lock);
+ atomic_set(&css_eval_scheduled, 0);
+ init_waitqueue_head(&css_eval_wq);
slow_subchannel_set = idset_sch_new();
if (!slow_subchannel_set) {
CIO_MSG_EVENT(0, "could not allocate slow subchannel set\n");
@@ -468,9 +472,17 @@ static int slow_eval_unknown_fn(struct subchannel_id schid, void *data)
static void css_slow_path_func(struct work_struct *unused)
{
+ unsigned long flags;
+
CIO_TRACE_EVENT(4, "slowpath");
for_each_subchannel_staged(slow_eval_known_fn, slow_eval_unknown_fn,
NULL);
+ spin_lock_irqsave(&slow_subchannel_lock, flags);
+ if (idset_is_empty(slow_subchannel_set)) {
+ atomic_set(&css_eval_scheduled, 0);
+ wake_up(&css_eval_wq);
+ }
+ spin_unlock_irqrestore(&slow_subchannel_lock, flags);
}
static DECLARE_WORK(slow_path_work, css_slow_path_func);
@@ -482,6 +494,7 @@ void css_schedule_eval(struct subchannel_id schid)
spin_lock_irqsave(&slow_subchannel_lock, flags);
idset_sch_add(slow_subchannel_set, schid);
+ atomic_set(&css_eval_scheduled, 1);
queue_work(slow_path_wq, &slow_path_work);
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
}
@@ -492,6 +505,7 @@ void css_schedule_eval_all(void)
spin_lock_irqsave(&slow_subchannel_lock, flags);
idset_fill(slow_subchannel_set);
+ atomic_set(&css_eval_scheduled, 1);
queue_work(slow_path_wq, &slow_path_work);
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
}
@@ -1007,6 +1021,8 @@ static int __init channel_subsystem_init_sync(void)
{
/* Allocate and register subchannels. */
for_each_subchannel(setup_subchannel, NULL);
+ /* Wait for the evaluation of subchannels to finish. */
+ wait_event(css_eval_wq, atomic_read(&css_eval_scheduled) == 0);
/* Wait for the initialization of ccw devices to finish. */
wait_event(ccw_device_init_wq,