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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>
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@ -217,6 +217,8 @@ void chsc_chp_offline(struct chp_id chpid)
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if (chp_get_status(chpid) <= 0)
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return;
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/* Wait until previous actions have settled. */
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css_wait_for_slow_path();
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for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &chpid);
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}
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@ -303,7 +305,8 @@ static void s390_process_res_acc (struct res_acc_data *res_data)
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sprintf(dbf_txt, "fla%x", res_data->fla);
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CIO_TRACE_EVENT( 2, dbf_txt);
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}
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/* Wait until previous actions have settled. */
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css_wait_for_slow_path();
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/*
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* I/O resources may have become accessible.
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* Scan through all subchannels that may be concerned and
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@ -561,9 +564,12 @@ void chsc_chp_online(struct chp_id chpid)
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sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
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CIO_TRACE_EVENT(2, dbf_txt);
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if (chp_get_status(chpid) != 0)
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if (chp_get_status(chpid) != 0) {
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/* Wait until previous actions have settled. */
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css_wait_for_slow_path();
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for_each_subchannel_staged(__chp_add, __chp_add_new_sch,
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&chpid);
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}
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}
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static void __s390_subchannel_vary_chpid(struct subchannel *sch,
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@ -650,6 +656,8 @@ __s390_vary_chpid_on(struct subchannel_id schid, void *data)
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*/
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int chsc_chp_vary(struct chp_id chpid, int on)
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{
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/* Wait until previous actions have settled. */
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css_wait_for_slow_path();
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/*
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* Redo PathVerification on the devices the chpid connects to
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*/
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@ -533,6 +533,12 @@ void css_schedule_eval_all(void)
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spin_unlock_irqrestore(&slow_subchannel_lock, flags);
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}
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void css_wait_for_slow_path(void)
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{
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flush_workqueue(ccw_device_notify_work);
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flush_workqueue(slow_path_wq);
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}
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/* Reprobe subchannel if unregistered. */
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static int reprobe_subchannel(struct subchannel_id schid, void *data)
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{
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@ -144,6 +144,7 @@ struct schib;
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int css_sch_is_valid(struct schib *);
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extern struct workqueue_struct *slow_path_wq;
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void css_wait_for_slow_path(void);
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extern struct attribute_group *subch_attr_groups[];
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#endif
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