s390/sclp: avoid copy of sclp_info_sccb

For extended sccb support, sccb size could be up to 3 pages. Hence avoid
copy of sclp_info_sccb.

Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

drivers/s390/char/sclp.h

@@ -328,7 +328,7 @@ unsigned int sclp_early_con_check_vt220(struct init_sccb *sccb);
 int sclp_early_set_event_mask(struct init_sccb *sccb,
 			      sccb_mask_t receive_mask,
 			      sccb_mask_t send_mask);
-int sclp_early_get_info(struct read_info_sccb *info);
+struct read_info_sccb * __init sclp_early_get_info(void);
 
 /* useful inlines */
 

drivers/s390/char/sclp_early.c

@@ -22,12 +22,14 @@ static struct sclp_ipl_info sclp_ipl_info;
 struct sclp_info sclp;
 EXPORT_SYMBOL(sclp);
 
-static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb)
+static void __init sclp_early_facilities_detect(void)
 {
 	struct sclp_core_entry *cpue;
+	struct read_info_sccb *sccb;
 	u16 boot_cpu_address, cpu;
 
-	if (sclp_early_get_info(sccb))
+	sccb = sclp_early_get_info();
+	if (!sccb)
 		return;
 
 	sclp.facilities = sccb->facilities;
@@ -155,7 +157,7 @@ void __init sclp_early_detect(void)
 {
 	void *sccb = sclp_early_sccb;
 
-	sclp_early_facilities_detect(sccb);
+	sclp_early_facilities_detect();
 
 	/*
 	 * Turn off SCLP event notifications.  Also save remote masks in the

drivers/s390/char/sclp_early_core.c

@@ -258,13 +258,12 @@ int __init sclp_early_read_info(void)
 	return -EIO;
 }
 
-int __init sclp_early_get_info(struct read_info_sccb *info)
+struct read_info_sccb * __init sclp_early_get_info(void)
 {
 	if (!sclp_info_sccb_valid)
-		return -EIO;
+		return NULL;
 
-	*info = sclp_info_sccb;
-	return 0;
+	return &sclp_info_sccb;
 }
 
 int __init sclp_early_get_memsize(unsigned long *mem)