s390x/event-facility.c: remove unneeded labels

'out' label from write_event_mask() and write_event_data()
can be replaced by 'return'.

The 'out' label from read_event_data() can also be replaced.
However, as suggested by Cornelia Huck, instead of simply
replacing the 'out' label, let's also change the code flow
a bit to make it clearer that sccb events are always handled
regardless of the mask for unconditional reads, while selective
reads are handled if the mask is valid.

CC: Cornelia Huck <cohuck@redhat.com>
CC: Thomas Huth <thuth@redhat.com>
CC: Halil Pasic <pasic@linux.ibm.com>
CC: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20200108144607.878862-1-danielhb413@gmail.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

1 files changed, 12 insertions, 21 deletions

diff --git a/hw/s390x/event-facility.c b/hw/s390x/event-facility.c
index 6afe278cad..8a93b8a1da 100644
--- a/hw/s390x/event-facility.c
+++ b/hw/s390x/event-facility.c
@@ -182,11 +182,11 @@ static void write_event_data(SCLPEventFacility *ef, SCCB *sccb)
 {
     if (sccb->h.function_code != SCLP_FC_NORMAL_WRITE) {
         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
-        goto out;
+        return;
     }
     if (be16_to_cpu(sccb->h.length) < 8) {
         sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
-        goto out;
+        return;
     }
     /* first do a sanity check of the write events */
     sccb->h.response_code = cpu_to_be16(write_event_length_check(sccb));
@@ -196,9 +196,6 @@ static void write_event_data(SCLPEventFacility *ef, SCCB *sccb)
         sccb->h.response_code =
                 cpu_to_be16(handle_sccb_write_events(ef, sccb));
     }
-
-out:
-    return;
 }
 
 static uint16_t handle_sccb_read_events(SCLPEventFacility *ef, SCCB *sccb,
@@ -262,17 +259,18 @@ static void read_event_data(SCLPEventFacility *ef, SCCB *sccb)
 
     if (be16_to_cpu(sccb->h.length) != SCCB_SIZE) {
         sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
-        goto out;
+        return;
     }
 
-    sclp_cp_receive_mask = ef->receive_mask;
-
-    /* get active selection mask */
     switch (sccb->h.function_code) {
     case SCLP_UNCONDITIONAL_READ:
-        sclp_active_selection_mask = sclp_cp_receive_mask;
+        sccb->h.response_code = cpu_to_be16(
+            handle_sccb_read_events(ef, sccb, ef->receive_mask));
         break;
     case SCLP_SELECTIVE_READ:
+        /* get active selection mask */
+        sclp_cp_receive_mask = ef->receive_mask;
+
         copy_mask((uint8_t *)&sclp_active_selection_mask, (uint8_t *)&red->mask,
                   sizeof(sclp_active_selection_mask), ef->mask_length);
         sclp_active_selection_mask = be64_to_cpu(sclp_active_selection_mask);
@@ -280,18 +278,14 @@ static void read_event_data(SCLPEventFacility *ef, SCCB *sccb)
             (sclp_active_selection_mask & ~sclp_cp_receive_mask)) {
             sccb->h.response_code =
                     cpu_to_be16(SCLP_RC_INVALID_SELECTION_MASK);
-            goto out;
+        } else {
+            sccb->h.response_code = cpu_to_be16(
+                handle_sccb_read_events(ef, sccb, sclp_active_selection_mask));
         }
         break;
     default:
         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
-        goto out;
     }
-    sccb->h.response_code = cpu_to_be16(
-            handle_sccb_read_events(ef, sccb, sclp_active_selection_mask));
-
-out:
-    return;
 }
 
 static void write_event_mask(SCLPEventFacility *ef, SCCB *sccb)
@@ -303,7 +297,7 @@ static void write_event_mask(SCLPEventFacility *ef, SCCB *sccb)
     if (!mask_length || (mask_length > SCLP_EVENT_MASK_LEN_MAX) ||
         ((mask_length != 4) && !ef->allow_all_mask_sizes)) {
         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_MASK_LENGTH);
-        goto out;
+        return;
     }
 
     /*
@@ -328,9 +322,6 @@ static void write_event_mask(SCLPEventFacility *ef, SCCB *sccb)
 
     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
     ef->mask_length = mask_length;
-
-out:
-    return;
 }
 
 /* qemu object creation and initialization functions */