[S390] dasd: revalidate server for new pathgroup

If a pathgroup is established we get an event and have to revalidate
the server to propagate supported features like PAV and enable them.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 1b6e7ea9347f..70880be26015 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1550,6 +1550,24 @@ static void dasd_eckd_validate_server(struct dasd_device *device)
                         "returned rc=%d", private->uid.ssid, rc);
 }
 
+/*
+ * worker to do a validate server in case of a lost pathgroup
+ */
+static void dasd_eckd_do_validate_server(struct work_struct *work)
+{
+        struct dasd_device *device = container_of(work, struct dasd_device,
+                                                  kick_validate);
+        dasd_eckd_validate_server(device);
+        dasd_put_device(device);
+}
+
+static void dasd_eckd_kick_validate_server(struct dasd_device *device)
+{
+        dasd_get_device(device);
+        /* queue call to do_validate_server to the kernel event daemon. */
+        schedule_work(&device->kick_validate);
+}
+
 static u32 get_fcx_max_data(struct dasd_device *device)
 {
 #if defined(CONFIG_64BIT)
@@ -1595,6 +1613,9 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
         int readonly;
         unsigned long value;
 
+        /* setup work queue for validate server*/
+        INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
+
         if (!ccw_device_is_pathgroup(device->cdev)) {
                 dev_warn(&device->cdev->dev,
                          "A channel path group could not be established\n");
@@ -4259,6 +4280,7 @@ static struct dasd_discipline dasd_eckd_discipline = {
         .restore = dasd_eckd_restore_device,
         .reload = dasd_eckd_reload_device,
         .get_uid = dasd_eckd_get_uid,
+        .kick_validate = dasd_eckd_kick_validate_server,
 };
 
 static int __init