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[S390] cio: Fix race for "fast" path gone/path back situations. 

Make sure we wait for previous evaluations triggered by path state
changes to have settled before we manipulate path states again.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Cornelia Huck 2008-04-17 07:45:59 +02:00 committed by Heiko Carstens
parent 374b8f45f1
commit 22806dc1a8
3 changed files with 17 additions and 2 deletions
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12
drivers/s390/cio/chsc.c
View File

@ -217,6 +217,8 @@ void chsc_chp_offline(struct chp_id chpid)
if (chp_get_status(chpid) <= 0)
return;
/* Wait until previous actions have settled. */
css_wait_for_slow_path();
for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &chpid);
}
@ -303,7 +305,8 @@ static void s390_process_res_acc (struct res_acc_data *res_data)
sprintf(dbf_txt, "fla%x", res_data->fla);
CIO_TRACE_EVENT( 2, dbf_txt);
}
/* Wait until previous actions have settled. */
css_wait_for_slow_path();
/*
* I/O resources may have become accessible.
* Scan through all subchannels that may be concerned and
@ -561,9 +564,12 @@ void chsc_chp_online(struct chp_id chpid)
sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
CIO_TRACE_EVENT(2, dbf_txt);
if (chp_get_status(chpid) != 0)
if (chp_get_status(chpid) != 0) {
/* Wait until previous actions have settled. */
css_wait_for_slow_path();
for_each_subchannel_staged(__chp_add, __chp_add_new_sch,
&chpid);
}
}
static void __s390_subchannel_vary_chpid(struct subchannel *sch,
@ -650,6 +656,8 @@ __s390_vary_chpid_on(struct subchannel_id schid, void *data)
*/
int chsc_chp_vary(struct chp_id chpid, int on)
{
/* Wait until previous actions have settled. */
css_wait_for_slow_path();
/*
* Redo PathVerification on the devices the chpid connects to
*/

6
drivers/s390/cio/css.c
View File

@ -533,6 +533,12 @@ void css_schedule_eval_all(void)
spin_unlock_irqrestore(&slow_subchannel_lock, flags);
}
void css_wait_for_slow_path(void)
{
flush_workqueue(ccw_device_notify_work);
flush_workqueue(slow_path_wq);
}
/* Reprobe subchannel if unregistered. */
static int reprobe_subchannel(struct subchannel_id schid, void *data)
{

1
drivers/s390/cio/css.h
View File

@ -144,6 +144,7 @@ struct schib;
int css_sch_is_valid(struct schib *);
extern struct workqueue_struct *slow_path_wq;
void css_wait_for_slow_path(void);
extern struct attribute_group *subch_attr_groups[];
#endif