diff --git a/hw/i2c/pm_smbus.c b/hw/i2c/pm_smbus.c
index 9f500677358c5021c1d5d44cc953dca42e150b47..fedb5fb4d4f8871ad9a95a2721106288bb9f64de 100644
--- a/hw/i2c/pm_smbus.c
+++ b/hw/i2c/pm_smbus.c
@@ -60,59 +60,78 @@ static void smb_transaction(PMSMBus *s)
     uint8_t cmd = s->smb_cmd;
     uint8_t addr = s->smb_addr >> 1;
     I2CBus *bus = s->smbus;
+    int ret;
 
     SMBUS_DPRINTF("SMBus trans addr=0x%02x prot=0x%02x\n", addr, prot);
     /* Transaction isn't exec if STS_DEV_ERR bit set */
     if ((s->smb_stat & STS_DEV_ERR) != 0)  {
-            goto error;
-        }
+        goto error;
+    }
     switch(prot) {
     case 0x0:
-        smbus_quick_command(bus, addr, read);
-        s->smb_stat |= STS_BYTE_DONE | STS_INTR;
-        break;
+        ret = smbus_quick_command(bus, addr, read);
+        goto done;
     case 0x1:
         if (read) {
-            s->smb_data0 = smbus_receive_byte(bus, addr);
+            ret = smbus_receive_byte(bus, addr);
+            goto data8;
         } else {
-            smbus_send_byte(bus, addr, cmd);
+            ret = smbus_send_byte(bus, addr, cmd);
+            goto done;
         }
-        s->smb_stat |= STS_BYTE_DONE | STS_INTR;
-        break;
     case 0x2:
         if (read) {
-            s->smb_data0 = smbus_read_byte(bus, addr, cmd);
+            ret = smbus_read_byte(bus, addr, cmd);
+            goto data8;
         } else {
-            smbus_write_byte(bus, addr, cmd, s->smb_data0);
+            ret = smbus_write_byte(bus, addr, cmd, s->smb_data0);
+            goto done;
         }
-        s->smb_stat |= STS_BYTE_DONE | STS_INTR;
         break;
     case 0x3:
         if (read) {
-            uint16_t val;
-            val = smbus_read_word(bus, addr, cmd);
-            s->smb_data0 = val;
-            s->smb_data1 = val >> 8;
+            ret = smbus_read_word(bus, addr, cmd);
+            goto data16;
         } else {
-            smbus_write_word(bus, addr, cmd, (s->smb_data1 << 8) | s->smb_data0);
+            ret = smbus_write_word(bus, addr, cmd, (s->smb_data1 << 8) | s->smb_data0);
+            goto done;
         }
-        s->smb_stat |= STS_BYTE_DONE | STS_INTR;
         break;
     case 0x5:
         if (read) {
-            s->smb_data0 = smbus_read_block(bus, addr, cmd, s->smb_data);
+            ret = smbus_read_block(bus, addr, cmd, s->smb_data);
+            goto data8;
         } else {
-            smbus_write_block(bus, addr, cmd, s->smb_data, s->smb_data0);
+            ret = smbus_write_block(bus, addr, cmd, s->smb_data, s->smb_data0);
+            goto done;
         }
-        s->smb_stat |= STS_BYTE_DONE | STS_INTR;
         break;
     default:
         goto error;
     }
+    abort();
+
+data16:
+    if (ret < 0) {
+        goto error;
+    }
+    s->smb_data1 = ret >> 8;
+data8:
+    if (ret < 0) {
+        goto error;
+    }
+    s->smb_data0 = ret;
+done:
+    if (ret < 0) {
+        goto error;
+    }
+    s->smb_stat |= STS_BYTE_DONE | STS_INTR;
     return;
 
-  error:
+error:
     s->smb_stat |= STS_DEV_ERR;
+    return;
+
 }
 
 static void smb_ioport_writeb(void *opaque, hwaddr addr, uint64_t val,