From 255305536c1b56ad09590f1400fb2c788265e34e Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Tue, 22 Sep 2009 22:58:34 +0200 Subject: [S390] cio: introduce css_eval_scheduled Use css_eval_scheduled to determine if all scheduled subchannel evaluation is finished. Wait for this value to be 0 in the channel subsystem init function. Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/css.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'drivers/s390/cio/css.c') 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, -- cgit v1.2.3