From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Thu, 2 Feb 2017 11:33:03 +0000 (+0100)
Subject: s390/sclp: get rid of common response code handling
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f694bb3a36a8113addd31817e4b5aca42326353d;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

s390/sclp: get rid of common response code handling

Get rid of common response code handling. Each command requires its
own response code handling anyway. Also the retry in case of -EBUSY
does not work and can be simply removed.

Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h
index 78d5f542d979..53b5d1b9761a 100644
--- a/drivers/s390/char/sclp.h
+++ b/drivers/s390/char/sclp.h
@@ -224,7 +224,6 @@ extern unsigned long sclp_console_full;
 extern char sclp_early_sccb[PAGE_SIZE];
 
 void sclp_early_wait_irq(void);
-int sclp_early_cmd_sync(sclp_cmdw_t cmd, void *sccb);
 int sclp_early_cmd(sclp_cmdw_t cmd, void *sccb);
 unsigned int sclp_early_con_check_linemode(struct init_sccb *sccb);
 int sclp_early_set_event_mask(struct init_sccb *sccb,
diff --git a/drivers/s390/char/sclp_early.c b/drivers/s390/char/sclp_early.c
index 2f9e50379e64..519ec1787117 100644
--- a/drivers/s390/char/sclp_early.c
+++ b/drivers/s390/char/sclp_early.c
@@ -62,20 +62,16 @@ EXPORT_SYMBOL(sclp);
 
 static int __init sclp_early_read_info(struct read_info_sccb *sccb)
 {
-	int rc, i;
+	int i;
 	sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
 				  SCLP_CMDW_READ_SCP_INFO};
 
 	for (i = 0; i < ARRAY_SIZE(commands); i++) {
-		do {
-			memset(sccb, 0, sizeof(*sccb));
-			sccb->header.length = sizeof(*sccb);
-			sccb->header.function_code = 0x80;
-			sccb->header.control_mask[2] = 0x80;
-			rc = sclp_early_cmd_sync(commands[i], sccb);
-		} while (rc == -EBUSY);
-
-		if (rc)
+		memset(sccb, 0, sizeof(*sccb));
+		sccb->header.length = sizeof(*sccb);
+		sccb->header.function_code = 0x80;
+		sccb->header.control_mask[2] = 0x80;
+		if (sclp_early_cmd(commands[i], sccb))
 			break;
 		if (sccb->header.response_code == 0x10)
 			return 0;
@@ -167,16 +163,11 @@ static int sclp_early_core_info_valid __initdata;
 
 static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb)
 {
-	int rc;
-
 	if (!SCLP_HAS_CPU_INFO)
 		return;
 	memset(sccb, 0, sizeof(*sccb));
 	sccb->header.length = sizeof(*sccb);
-	do {
-		rc = sclp_early_cmd_sync(SCLP_CMDW_READ_CPU_INFO, sccb);
-	} while (rc == -EBUSY);
-	if (rc)
+	if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb))
 		return;
 	if (sccb->header.response_code != 0x0010)
 		return;
@@ -204,6 +195,8 @@ static long __init sclp_early_hsa_size_init(struct sdias_sccb *sccb)
 	sccb->evbuf.dbs = 1;
 	if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb))
 		return -EIO;
+	if (sccb->hdr.response_code != 0x20)
+		return -EIO;
 	if (sccb->evbuf.blk_cnt == 0)
 		return 0;
 	return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
@@ -215,6 +208,8 @@ static long __init sclp_early_hsa_copy_wait(struct sdias_sccb *sccb)
 	sccb->hdr.length = PAGE_SIZE;
 	if (sclp_early_cmd(SCLP_CMDW_READ_EVENT_DATA, sccb))
 		return -EIO;
+	if ((sccb->hdr.response_code != 0x20) && (sccb->hdr.response_code != 0x220))
+		return -EIO;
 	if (sccb->evbuf.blk_cnt == 0)
 		return 0;
 	return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
diff --git a/drivers/s390/char/sclp_early_core.c b/drivers/s390/char/sclp_early_core.c
index cc3ad8c69a7a..5029cc87e80f 100644
--- a/drivers/s390/char/sclp_early_core.c
+++ b/drivers/s390/char/sclp_early_core.c
@@ -50,7 +50,7 @@ void sclp_early_wait_irq(void)
 	__ctl_load(cr0.val, 0, 0);
 }
 
-int sclp_early_cmd_sync(sclp_cmdw_t cmd, void *sccb)
+int sclp_early_cmd(sclp_cmdw_t cmd, void *sccb)
 {
 	unsigned long flags;
 	int rc;
@@ -65,20 +65,6 @@ out:
 	return rc;
 }
 
-int sclp_early_cmd(sclp_cmdw_t cmd, void *sccb)
-{
-	int rc;
-
-	do {
-		rc = sclp_early_cmd_sync(cmd, sccb);
-	} while (rc == -EBUSY);
-	if (rc)
-		return -EIO;
-	if (((struct sccb_header *) sccb)->response_code != 0x0020)
-		return -EIO;
-	return 0;
-}
-
 struct write_sccb {
 	struct sccb_header header;
 	struct msg_buf msg;
@@ -163,7 +149,11 @@ int sclp_early_set_event_mask(struct init_sccb *sccb,
 	sccb->mask_length = sizeof(sccb_mask_t);
 	sccb->receive_mask = receive_mask;
 	sccb->send_mask = send_mask;
-	return sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
+	if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_MASK, sccb))
+		return -EIO;
+	if (sccb->header.response_code != 0x20)
+		return -EIO;
+	return 0;
 }
 
 unsigned int sclp_early_con_check_linemode(struct init_sccb *sccb)