change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/drivers/s390/block/dasd_alias.c
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@@ -675,12 +675,12 @@
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 struct dasd_device *dasd_alias_get_start_dev(struct dasd_device *base_device)
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 {
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 	struct dasd_eckd_private *alias_priv, *private = base_device->private;
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-	struct alias_pav_group *group = private->pavgroup;
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 	struct alias_lcu *lcu = private->lcu;
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 	struct dasd_device *alias_device;
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+	struct alias_pav_group *group;
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 	unsigned long flags;
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-	if (!group || !lcu)
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+	if (!lcu)
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 		return NULL;
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 	if (lcu->pav == NO_PAV ||
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 	    lcu->flags & (NEED_UAC_UPDATE | UPDATE_PENDING))
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@@ -697,6 +697,11 @@
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 	}
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 	spin_lock_irqsave(&lcu->lock, flags);
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+	group = private->pavgroup;
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+	if (!group) {
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+		spin_unlock_irqrestore(&lcu->lock, flags);
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+		return NULL;
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+	}
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 	alias_device = group->next;
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 	if (!alias_device) {
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 		if (list_empty(&group->aliaslist)) {