[S390] cio: handle error during device recognition consistently

Remove the return code from ccw_device_recognition and handle
recognition errors through the existing callback
ccw_device_recog_done to reduce cleanup code duplication.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

3 files changed, 15 insertions, 64 deletions

diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index ee3450667687..7ad6bfb2e55e 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -486,18 +486,9 @@ static int online_store_handle_offline(struct ccw_device *cdev)
 
 static int online_store_recog_and_online(struct ccw_device *cdev)
 {
-        int ret;
-
         /* Do device recognition, if needed. */
         if (cdev->private->state == DEV_STATE_BOXED) {
-                ret = ccw_device_recognition(cdev);
-                if (ret) {
-                        CIO_MSG_EVENT(0, "Couldn't start recognition "
-                                      "for device 0.%x.%04x (ret=%d)\n",
-                                      cdev->private->dev_id.ssid,
-                                      cdev->private->dev_id.devno, ret);
-                        return ret;
-                }
+                ccw_device_recognition(cdev);
                 wait_event(cdev->private->wait_q,
                            cdev->private->flags.recog_done);
                 if (cdev->private->state != DEV_STATE_OFFLINE)
@@ -746,7 +737,7 @@ static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
         return cdev;
 }
 
-static int io_subchannel_recog(struct ccw_device *, struct subchannel *);
+static void io_subchannel_recog(struct ccw_device *, struct subchannel *);
 
 static void sch_create_and_recog_new_device(struct subchannel *sch)
 {
@@ -760,16 +751,7 @@ static void sch_create_and_recog_new_device(struct subchannel *sch)
                 return;
         }
         /* Start recognition for the new ccw device. */
-        if (io_subchannel_recog(cdev, sch)) {
-                spin_lock_irq(sch->lock);
-                sch_set_cdev(sch, NULL);
-                spin_unlock_irq(sch->lock);
-                css_sch_device_unregister(sch);
-                /* Put reference from io_subchannel_create_ccwdev(). */
-                put_device(&sch->dev);
-                /* Give up initial reference. */
-                put_device(&cdev->dev);
-        }
+        io_subchannel_recog(cdev, sch);
 }
 
 /*
@@ -879,10 +861,8 @@ io_subchannel_recog_done(struct ccw_device *cdev)
         }
 }
 
-static int
-io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
+static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
 {
-        int rc;
         struct ccw_device_private *priv;
 
         cdev->ccwlock = sch->lock;
@@ -903,13 +883,8 @@ io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
         /* Start async. device sensing. */
         spin_lock_irq(sch->lock);
         sch_set_cdev(sch, cdev);
-        rc = ccw_device_recognition(cdev);
+        ccw_device_recognition(cdev);
         spin_unlock_irq(sch->lock);
-        if (rc) {
-                if (atomic_dec_and_test(&ccw_device_init_count))
-                        wake_up(&ccw_device_init_wq);
-        }
-        return rc;
 }
 
 static int ccw_device_move_to_sch(struct ccw_device *cdev,
@@ -1528,10 +1503,7 @@ static int ccw_device_console_enable(struct ccw_device *cdev,
         sch->driver = &io_subchannel_driver;
         /* Initialize the ccw_device structure. */
         cdev->dev.parent= &sch->dev;
-        rc = io_subchannel_recog(cdev, sch);
-        if (rc)
-                return rc;
-
+        io_subchannel_recog(cdev, sch);
         /* Now wait for the async. recognition to come to an end. */
         spin_lock_irq(cdev->ccwlock);
         while (!dev_fsm_final_state(cdev))
@@ -1547,7 +1519,7 @@ static int ccw_device_console_enable(struct ccw_device *cdev,
         rc = 0;
 out_unlock:
         spin_unlock_irq(cdev->ccwlock);
-        return 0;
+        return rc;
 }
 
 struct ccw_device *
@@ -1789,7 +1761,6 @@ static int ccw_device_pm_thaw(struct device *dev)
 static void __ccw_device_pm_restore(struct ccw_device *cdev)
 {
         struct subchannel *sch = to_subchannel(cdev->dev.parent);
-        int ret;
 
         if (cio_is_console(sch->schid))
                 goto out;
@@ -1799,22 +1770,10 @@ static void __ccw_device_pm_restore(struct ccw_device *cdev)
          */
         spin_lock_irq(sch->lock);
         cdev->private->flags.resuming = 1;
-        ret = ccw_device_recognition(cdev);
+        ccw_device_recognition(cdev);
         spin_unlock_irq(sch->lock);
-        if (ret) {
-                CIO_MSG_EVENT(0, "Couldn't start recognition for device "
-                              "0.%x.%04x (ret=%d)\n",
-                              cdev->private->dev_id.ssid,
-                              cdev->private->dev_id.devno, ret);
-                spin_lock_irq(sch->lock);
-                cdev->private->state = DEV_STATE_DISCONNECTED;
-                spin_unlock_irq(sch->lock);
-                /* notify driver after the resume cb */
-                goto out;
-        }
         wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) ||
                    cdev->private->state == DEV_STATE_DISCONNECTED);
-
 out:
         cdev->private->flags.resuming = 0;
 }
diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h
index adaa27efc59e..78662e05d317 100644
--- a/drivers/s390/cio/device.h
+++ b/drivers/s390/cio/device.h
@@ -83,7 +83,7 @@ int ccw_device_cancel_halt_clear(struct ccw_device *);
 
 int ccw_device_is_orphan(struct ccw_device *);
 
-int ccw_device_recognition(struct ccw_device *);
+void ccw_device_recognition(struct ccw_device *);
 int ccw_device_online(struct ccw_device *);
 int ccw_device_offline(struct ccw_device *);
 void ccw_device_update_sense_data(struct ccw_device *);
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index b163743bf586..83adb919648f 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -498,20 +498,9 @@ ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 /*
  * Start device recognition.
  */
-int
-ccw_device_recognition(struct ccw_device *cdev)
+void ccw_device_recognition(struct ccw_device *cdev)
 {
-        struct subchannel *sch;
-        int ret;
-
-        sch = to_subchannel(cdev->dev.parent);
-        ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
-        if (ret != 0)
-                /* Couldn't enable the subchannel for i/o. Sick device. */
-                return ret;
-
-        /* After 60s the device recognition is considered to have failed. */
-        ccw_device_set_timeout(cdev, 60*HZ);
+        struct subchannel *sch = to_subchannel(cdev->dev.parent);
 
         /*
          * We used to start here with a sense pgid to find out whether a device
@@ -523,8 +512,11 @@ ccw_device_recognition(struct ccw_device *cdev)
          */
         cdev->private->flags.recog_done = 0;
         cdev->private->state = DEV_STATE_SENSE_ID;
+        if (cio_enable_subchannel(sch, (u32) (addr_t) sch)) {
+                ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
+                return;
+        }
         ccw_device_sense_id_start(cdev);
-        return 0;
 }
 
 /*