[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>

6 files changed, 15 insertions, 13 deletions

diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
index 25629b92dec3..2c7a1ee6b041 100644
--- a/drivers/s390/char/sclp.c
+++ b/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. */
diff --git a/drivers/s390/char/sclp.h b/drivers/s390/char/sclp.h
index aa8186d18aee..bac80e856f97 100644
--- a/drivers/s390/char/sclp.h
+++ b/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 *);
diff --git a/drivers/s390/char/sclp_config.c b/drivers/s390/char/sclp_config.c
index 9dc77f14fa52..b8f35bc52b7b 100644
--- a/drivers/s390/char/sclp_config.c
+++ b/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;
diff --git a/drivers/s390/char/sclp_cpi_sys.c b/drivers/s390/char/sclp_cpi_sys.c
index 41617032afdc..9f37456222e9 100644
--- a/drivers/s390/char/sclp_cpi_sys.c
+++ b/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;
diff --git a/drivers/s390/char/sclp_rw.c b/drivers/s390/char/sclp_rw.c
index ad7195d3de0c..da09781b32f7 100644
--- a/drivers/s390/char/sclp_rw.c
+++ b/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
diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c
index f47f4a768be5..92f527201792 100644
--- a/drivers/s390/char/sclp_vt220.c
+++ b/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;
         }