4 files changed, 30 insertions, 10 deletions

diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
index 1990285296c..c316051d9bd 100644
--- a/drivers/s390/char/sclp.c
+++ b/drivers/s390/char/sclp.c
@@ -1252,7 +1252,7 @@ static __init int sclp_initcall(void)
 		return rc;
 
 	sclp_pdev = platform_device_register_simple("sclp", -1, NULL, 0);
-	rc = PTR_RET(sclp_pdev);
+	rc = PTR_ERR_OR_ZERO(sclp_pdev);
 	if (rc)
 		goto fail_platform_driver_unregister;
 
diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index 6e8f90f84e4..6e14999f9e8 100644
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -515,7 +515,7 @@ static int __init sclp_detect_standby_memory(void)
 	if (rc)
 		goto out;
 	sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
-	rc = PTR_RET(sclp_pdev);
+	rc = PTR_ERR_OR_ZERO(sclp_pdev);
 	if (rc)
 		goto out_driver;
 	sclp_add_standby_memory();
diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c
index 4eed38cd0af..cd9c9190959 100644
--- a/drivers/s390/char/sclp_vt220.c
+++ b/drivers/s390/char/sclp_vt220.c
@@ -97,13 +97,16 @@ static void sclp_vt220_pm_event_fn(struct sclp_register *reg,
 static int __sclp_vt220_emit(struct sclp_vt220_request *request);
 static void sclp_vt220_emit_current(void);
 
-/* Registration structure for our interest in SCLP event buffers */
+/* Registration structure for SCLP output event buffers */
 static struct sclp_register sclp_vt220_register = {
 	.send_mask		= EVTYP_VT220MSG_MASK,
+	.pm_event_fn		= sclp_vt220_pm_event_fn,
+};
+
+/* Registration structure for SCLP input event buffers */
+static struct sclp_register sclp_vt220_register_input = {
 	.receive_mask		= EVTYP_VT220MSG_MASK,
-	.state_change_fn	= NULL,
 	.receiver_fn		= sclp_vt220_receiver_fn,
-	.pm_event_fn		= sclp_vt220_pm_event_fn,
 };
 
 
@@ -715,9 +718,14 @@ static int __init sclp_vt220_tty_init(void)
 	rc = tty_register_driver(driver);
 	if (rc)
 		goto out_init;
+	rc = sclp_register(&sclp_vt220_register_input);
+	if (rc)
+		goto out_reg;
 	sclp_vt220_driver = driver;
 	return 0;
 
+out_reg:
+	tty_unregister_driver(driver);
 out_init:
 	__sclp_vt220_cleanup();
 out_driver:
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index 9f0ea6cb692..e3bf885f4a6 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -541,18 +541,27 @@ static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
 
 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 {
-	do {
+	static int ntsm_unsupported;
+
+	while (true) {
 		memset(sei, 0, sizeof(*sei));
 		sei->request.length = 0x0010;
 		sei->request.code = 0x000e;
-		sei->ntsm = ntsm;
+		if (!ntsm_unsupported)
+			sei->ntsm = ntsm;
 
 		if (chsc(sei))
 			break;
 
 		if (sei->response.code != 0x0001) {
-			CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
-				      sei->response.code);
+			CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
+				      sei->response.code, sei->ntsm);
+
+			if (sei->response.code == 3 && sei->ntsm) {
+				/* Fallback for old firmware. */
+				ntsm_unsupported = 1;
+				continue;
+			}
 			break;
 		}
 
@@ -568,7 +577,10 @@ static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
 			CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
 			break;
 		}
-	} while (sei->u.nt0_area.flags & 0x80);
+
+		if (!(sei->u.nt0_area.flags & 0x80))
+			break;
+	}
 }
 
 /*