Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[sfrench/cifs-2.6.git] / drivers / s390 / block / dasd.c

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index acf222f91f5a97ac0564c25a5bea9386466d045b..0e86247d791e1b68abd8fd95a966c83c7845dea8 100644 (file)
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -37,6 +37,9 @@
  */
 #define DASD_CHANQ_MAX_SIZE 4
 
+#define DASD_SLEEPON_START_TAG (void *) 1
+#define DASD_SLEEPON_END_TAG   (void *) 2
+
 /*
  * SECTION: exported variables of dasd.c
  */
@@ -62,6 +65,7 @@ static void dasd_device_tasklet(struct dasd_device *);
 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);
@@ -112,6 +116,7 @@ struct dasd_device *dasd_alloc_device(void)
        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);
@@ -517,6 +522,26 @@ void dasd_kick_device(struct dasd_device *device)
        schedule_work(&device->kick_work);
 }
 
+/*
+ * 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.
@@ -1472,7 +1497,10 @@ void dasd_add_request_tail(struct dasd_ccw_req *cqr)
  */
 static void dasd_wakeup_cb(struct dasd_ccw_req *cqr, void *data)
 {
-       wake_up((wait_queue_head_t *) data);
+       spin_lock_irq(get_ccwdev_lock(cqr->startdev->cdev));
+       cqr->callback_data = DASD_SLEEPON_END_TAG;
+       spin_unlock_irq(get_ccwdev_lock(cqr->startdev->cdev));
+       wake_up(&generic_waitq);
 }
 
 static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
@@ -1482,10 +1510,7 @@ static inline int _wait_for_wakeup(struct dasd_ccw_req *cqr)
 
        device = cqr->startdev;
        spin_lock_irq(get_ccwdev_lock(device->cdev));
-       rc = ((cqr->status == DASD_CQR_DONE ||
-              cqr->status == DASD_CQR_NEED_ERP ||
-              cqr->status == DASD_CQR_TERMINATED) &&
-             list_empty(&cqr->devlist));
+       rc = (cqr->callback_data == DASD_SLEEPON_END_TAG);
        spin_unlock_irq(get_ccwdev_lock(device->cdev));
        return rc;
 }
@@ -1573,7 +1598,7 @@ static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
                        wait_event(generic_waitq, !(device->stopped));
 
                cqr->callback = dasd_wakeup_cb;
-               cqr->callback_data = (void *) &generic_waitq;
+               cqr->callback_data = DASD_SLEEPON_START_TAG;
                dasd_add_request_tail(cqr);
                if (interruptible) {
                        rc = wait_event_interruptible(
@@ -1652,7 +1677,7 @@ int dasd_sleep_on_immediatly(struct dasd_ccw_req *cqr)
        }
 
        cqr->callback = dasd_wakeup_cb;
-       cqr->callback_data = (void *) &generic_waitq;
+       cqr->callback_data = DASD_SLEEPON_START_TAG;
        cqr->status = DASD_CQR_QUEUED;
        list_add(&cqr->devlist, &device->ccw_queue);