[S390] sclp: clean up send/receive naming scheme

Make state change events adjust the correct mask by cleaning up
naming inconsistencies. Also remove chance for lockup by removing
unnecessary mask related check before reading events.
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/char/sclp.c

@@ -29,10 +29,10 @@ static ext_int_info_t ext_int_info_hwc;
 /* Lock to protect internal data consistency. */
 static DEFINE_SPINLOCK(sclp_lock);
 
-/* Mask of events that we can receive from the sclp interface. */
+/* Mask of events that we can send to the sclp interface. */
 static sccb_mask_t sclp_receive_mask;
 
-/* Mask of events that we can send to the sclp interface. */
+/* Mask of events that we can receive from the sclp interface. */
 static sccb_mask_t sclp_send_mask;
 
 /* List of registered event listeners and senders. */
@@ -380,7 +380,7 @@ sclp_interrupt_handler(__u16 code)
 		}
 		sclp_running_state = sclp_running_state_idle;
 	}
-	if (evbuf_pending && sclp_receive_mask != 0 &&
+	if (evbuf_pending &&
 	    sclp_activation_state == sclp_activation_state_active)
 		__sclp_queue_read_req();
 	spin_unlock(&sclp_lock);
@@ -459,8 +459,8 @@ sclp_dispatch_state_change(void)
 		reg = NULL;
 		list_for_each(l, &sclp_reg_list) {
 			reg = list_entry(l, struct sclp_register, list);
-			receive_mask = reg->receive_mask & sclp_receive_mask;
-			send_mask = reg->send_mask & sclp_send_mask;
+			receive_mask = reg->send_mask & sclp_receive_mask;
+			send_mask = reg->receive_mask & sclp_send_mask;
 			if (reg->sclp_receive_mask != receive_mask ||
 			    reg->sclp_send_mask != send_mask) {
 				reg->sclp_receive_mask = receive_mask;
@@ -615,8 +615,8 @@ struct init_sccb {
 	u16 mask_length;
 	sccb_mask_t receive_mask;
 	sccb_mask_t send_mask;
-	sccb_mask_t sclp_send_mask;
 	sccb_mask_t sclp_receive_mask;
+	sccb_mask_t sclp_send_mask;
 } __attribute__((packed));
 
 /* Prepare init mask request. Called while sclp_lock is locked. */

drivers/s390/char/sclp.h

@@ -122,11 +122,13 @@ struct sclp_req {
 /* of some routines it wants to be called from the low level driver */
 struct sclp_register {
 	struct list_head list;
-	/* event masks this user is registered for */
+	/* User wants to receive: */
 	sccb_mask_t receive_mask;
+	/* User wants to send: */
 	sccb_mask_t send_mask;
-	/* actually present events */
+	/* H/W can receive: */
 	sccb_mask_t sclp_receive_mask;
+	/* H/W can send: */
 	sccb_mask_t sclp_send_mask;
 	/* called if event type availability changes */
 	void (*state_change_fn)(struct sclp_register *);

drivers/s390/char/sclp_config.c

@@ -64,7 +64,7 @@ static int __init sclp_conf_init(void)
 		return rc;
 	}
 
-	if (!(sclp_conf_register.sclp_receive_mask & EVTYP_CONFMGMDATA_MASK)) {
+	if (!(sclp_conf_register.sclp_send_mask & EVTYP_CONFMGMDATA_MASK)) {
 		printk(KERN_WARNING TAG "no configuration management.\n");
 		sclp_unregister(&sclp_conf_register);
 		rc = -ENOSYS;

drivers/s390/char/sclp_cpi_sys.c

@@ -129,7 +129,7 @@ static int cpi_req(void)
 			"to hardware console.\n");
 		goto out;
 	}
-	if (!(sclp_cpi_event.sclp_send_mask & EVTYP_CTLPROGIDENT_MASK)) {
+	if (!(sclp_cpi_event.sclp_receive_mask & EVTYP_CTLPROGIDENT_MASK)) {
 		printk(KERN_WARNING "cpi: no control program "
 			"identification support\n");
 		rc = -EOPNOTSUPP;

drivers/s390/char/sclp_rw.c

@@ -452,10 +452,10 @@ sclp_emit_buffer(struct sclp_buffer *buffer,
 		return -EIO;
 
 	sccb = buffer->sccb;
-	if (sclp_rw_event.sclp_send_mask & EVTYP_MSG_MASK)
+	if (sclp_rw_event.sclp_receive_mask & EVTYP_MSG_MASK)
 		/* Use normal write message */
 		sccb->msg_buf.header.type = EVTYP_MSG;
-	else if (sclp_rw_event.sclp_send_mask & EVTYP_PMSGCMD_MASK)
+	else if (sclp_rw_event.sclp_receive_mask & EVTYP_PMSGCMD_MASK)
 		/* Use write priority message */
 		sccb->msg_buf.header.type = EVTYP_PMSGCMD;
 	else

drivers/s390/char/sclp_vt220.c

@@ -202,7 +202,7 @@ sclp_vt220_callback(struct sclp_req *request, void *data)
 static int
 __sclp_vt220_emit(struct sclp_vt220_request *request)
 {
-	if (!(sclp_vt220_register.sclp_send_mask & EVTYP_VT220MSG_MASK)) {
+	if (!(sclp_vt220_register.sclp_receive_mask & EVTYP_VT220MSG_MASK)) {
 		request->sclp_req.status = SCLP_REQ_FAILED;
 		return -EIO;
 	}