[S390] dasd: add dynamic pav toleration
For base Parallel Access Volume (PAV) there is a fixed mapping of
base and alias devices. With dynamic PAV this mapping can be changed
so that an alias device is used with another base device.
This patch enables the DASD device driver to tolerate dynamic PAV
changes.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index fa2339c..0e86247 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -65,6 +65,7 @@
static void dasd_block_tasklet(struct dasd_block *);
static void do_kick_device(struct work_struct *);
static void do_restore_device(struct work_struct *);
+static void do_reload_device(struct work_struct *);
static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
static void dasd_device_timeout(unsigned long);
static void dasd_block_timeout(unsigned long);
@@ -115,6 +116,7 @@
device->timer.data = (unsigned long) device;
INIT_WORK(&device->kick_work, do_kick_device);
INIT_WORK(&device->restore_device, do_restore_device);
+ INIT_WORK(&device->reload_device, do_reload_device);
device->state = DASD_STATE_NEW;
device->target = DASD_STATE_NEW;
mutex_init(&device->state_mutex);
@@ -521,6 +523,26 @@
}
/*
+ * dasd_reload_device will schedule a call do do_reload_device to the kernel
+ * event daemon.
+ */
+static void do_reload_device(struct work_struct *work)
+{
+ struct dasd_device *device = container_of(work, struct dasd_device,
+ reload_device);
+ device->discipline->reload(device);
+ dasd_put_device(device);
+}
+
+void dasd_reload_device(struct dasd_device *device)
+{
+ dasd_get_device(device);
+ /* queue call to dasd_reload_device to the kernel event daemon. */
+ schedule_work(&device->reload_device);
+}
+EXPORT_SYMBOL(dasd_reload_device);
+
+/*
* dasd_restore_device will schedule a call do do_restore_device to the kernel
* event daemon.
*/