[S390] css: update descriptor after hibernate

Update the channel path descriptors after hibernation.
This is done unlocked, since we are the only active
task at this time.

Note: chsc_determine_base_channel_path_desc is changed
to use spin_lock_irqsave, since it's called with
interrupts disabled in this case.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/chsc.c

@@ -680,9 +680,10 @@ int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 {
 	struct chsc_response_struct *chsc_resp;
 	struct chsc_scpd *scpd_area;
+	unsigned long flags;
 	int ret;
 
-	spin_lock_irq(&chsc_page_lock);
+	spin_lock_irqsave(&chsc_page_lock, flags);
 	scpd_area = chsc_page;
 	ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
 	if (ret)
@@ -690,7 +691,7 @@ int chsc_determine_base_channel_path_desc(struct chp_id chpid,
 	chsc_resp = (void *)&scpd_area->response;
 	memcpy(desc, &chsc_resp->data, sizeof(*desc));
 out:
-	spin_unlock_irq(&chsc_page_lock);
+	spin_unlock_irqrestore(&chsc_page_lock, flags);
 	return ret;
 }
 

drivers/s390/cio/css.c

@@ -1030,7 +1030,16 @@ subsys_initcall_sync(channel_subsystem_init_sync);
 
 void channel_subsystem_reinit(void)
 {
+	struct channel_path *chp;
+	struct chp_id chpid;
+
 	chsc_enable_facility(CHSC_SDA_OC_MSS);
+	chp_id_for_each(&chpid) {
+		chp = chpid_to_chp(chpid);
+		if (!chp)
+			continue;
+		chsc_determine_base_channel_path_desc(chpid, &chp->desc);
+	}
 }
 
 #ifdef CONFIG_PROC_FS