[S390] qdio: simplify error handling in irq handler

The check for the device status in qdio_establish_handle_irq()
had dead code. Remove the unused code and simplify the error
handling.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 12 insertions, 32 deletions

diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
index accd957454e7..ba4facc37011 100644
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@ -881,42 +881,26 @@ no_handler:
         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 }
 
-static int qdio_establish_check_errors(struct ccw_device *cdev, int cstat,
-                                       int dstat)
+static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
+                                      int dstat)
 {
         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 
-        if (cstat || (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
-                DBF_ERROR("EQ:ck con");
-                goto error;
-        }
+        DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 
-        if (!(dstat & DEV_STAT_DEV_END)) {
-                DBF_ERROR("EQ:no dev");
+        if (cstat)
                 goto error;
-        }
-
-        if (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) {
-                DBF_ERROR("EQ: bad io");
+        if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
                 goto error;
-        }
-        return 0;
+        if (!(dstat & DEV_STAT_DEV_END))
+                goto error;
+        qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
+        return;
+
 error:
         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
-
         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
-        return 1;
-}
-
-static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
-                                      int dstat)
-{
-        struct qdio_irq *irq_ptr = cdev->private->qdio_data;
-
-        DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
-        if (!qdio_establish_check_errors(cdev, cstat, dstat))
-                qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 }
 
 /* qdio interrupt handler */
@@ -946,7 +930,6 @@ void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
                 }
         }
         qdio_irq_check_sense(irq_ptr, irb);
-
         cstat = irb->scsw.cmd.cstat;
         dstat = irb->scsw.cmd.dstat;
 
@@ -954,22 +937,19 @@ void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
         case QDIO_IRQ_STATE_INACTIVE:
                 qdio_establish_handle_irq(cdev, cstat, dstat);
                 break;
-
         case QDIO_IRQ_STATE_CLEANUP:
                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
                 break;
-
         case QDIO_IRQ_STATE_ESTABLISHED:
         case QDIO_IRQ_STATE_ACTIVE:
                 if (cstat & SCHN_STAT_PCI) {
                         qdio_int_handler_pci(irq_ptr);
                         return;
                 }
-                if ((cstat & ~SCHN_STAT_PCI) || dstat) {
+                if (cstat || dstat)
                         qdio_handle_activate_check(cdev, intparm, cstat,
                                                    dstat);
-                        break;
-                }
+                break;
         default:
                 WARN_ON(1);
         }