[S390] cio: fix init_count in case of recognition after steal lock

After we try to steal a lock on a ccw device in boxed state,
we have to restart device recognition and potentially reprobing.

In this case ccw_device_init_count was erroneously decreased
twice. This patch fixes the issue.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index c6abb75..6d229f3 100644 (file)
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -764,7 +764,7 @@ static void sch_create_and_recog_new_device(struct subchannel *sch)
 static void io_subchannel_register(struct ccw_device *cdev)
 {
        struct subchannel *sch;
-       int ret;
+       int ret, adjust_init_count = 1;
        unsigned long flags;
 
        sch = to_subchannel(cdev->dev.parent);
@@ -793,6 +793,7 @@ static void io_subchannel_register(struct ccw_device *cdev)
                                              cdev->private->dev_id.ssid,
                                              cdev->private->dev_id.devno);
                }
+               adjust_init_count = 0;
                goto out;
        }
        /*
@@ -818,7 +819,7 @@ out:
        cdev->private->flags.recog_done = 1;
        wake_up(&cdev->private->wait_q);
 out_err:
-       if (atomic_dec_and_test(&ccw_device_init_count))
+       if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count))
                wake_up(&ccw_device_init_wq);
 }