[S390] cio: add per device initialization status flag

The function ccw_device_unregister has to ensure to remove
all references obtained by device_add and device_initialize.
Unfortunately it gets called for devices which are
1) uninitialized, 2) initialized but unregistered, and
3) registered devices. To distinguish 1) and 2) this patch
introduces a new flag "initialized", which is 1 as long as we
hold the initial device reference.

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 f4401ed..e8cb99a 100644 (file)
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -304,7 +304,11 @@ int ccw_device_is_orphan(struct ccw_device *cdev)
 static void ccw_device_unregister(struct ccw_device *cdev)
 {
        if (device_is_registered(&cdev->dev)) {
+               /* Undo device_add(). */
                device_del(&cdev->dev);
+       }
+       if (cdev->private->flags.initialized) {
+               cdev->private->flags.initialized = 0;
                /* Release reference from device_initialize(). */
                put_device(&cdev->dev);
        }
@@ -716,6 +720,7 @@ static int io_subchannel_initialize_dev(struct subchannel *sch,
                put_device(&cdev->dev);
                return -ENODEV;
        }
+       cdev->private->flags.initialized = 1;
        return 0;
 }
 
@@ -998,6 +1003,7 @@ static int io_subchannel_probe(struct subchannel *sch)
                cdev = sch_get_cdev(sch);
                cdev->dev.groups = ccwdev_attr_groups;
                device_initialize(&cdev->dev);
+               cdev->private->flags.initialized = 1;
                ccw_device_register(cdev);
                /*
                 * Check if the device is already online. If it is

diff --git a/drivers/s390/cio/io_sch.h b/drivers/s390/cio/io_sch.h
index ca1063d..dbc69a5 100644 (file)
--- a/drivers/s390/cio/io_sch.h
+++ b/drivers/s390/cio/io_sch.h
@@ -167,6 +167,7 @@ struct ccw_device_private {
                unsigned int resuming:1;    /* recognition while resume */
                unsigned int pgroup:1;      /* pathgroup is set up */
                unsigned int mpath:1;       /* multipathing is set up */
+               unsigned int initialized:1; /* set if initial reference held */
        } __attribute__((packed)) flags;
        unsigned long intparm;  /* user interruption parameter */
        struct qdio_irq *qdio_data;