Merge branch 'linus' into x86/xen

7 files changed, 26 insertions, 38 deletions

diff --git a/drivers/s390/char/raw3270.c b/drivers/s390/char/raw3270.c
index 0d98f1ff2ed..848ef7e8523 100644
--- a/drivers/s390/char/raw3270.c
+++ b/drivers/s390/char/raw3270.c
@@ -549,7 +549,6 @@ raw3270_start_init(struct raw3270 *rp, struct raw3270_view *view,
 		   struct raw3270_request *rq)
 {
 	unsigned long flags;
-	wait_queue_head_t wq;
 	int rc;
 
 #ifdef CONFIG_TN3270_CONSOLE
@@ -566,20 +565,20 @@ raw3270_start_init(struct raw3270 *rp, struct raw3270_view *view,
 		return rq->rc;
 	}
 #endif
-	init_waitqueue_head(&wq);
 	rq->callback = raw3270_wake_init;
-	rq->callback_data = &wq;
+	rq->callback_data = &raw3270_wait_queue;
 	spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
 	rc = __raw3270_start(rp, view, rq);
 	spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
 	if (rc)
 		return rc;
 	/* Now wait for the completion. */
-	rc = wait_event_interruptible(wq, raw3270_request_final(rq));
+	rc = wait_event_interruptible(raw3270_wait_queue,
+				      raw3270_request_final(rq));
 	if (rc == -ERESTARTSYS) {	/* Interrupted by a signal. */
 		raw3270_halt_io(view->dev, rq);
 		/* No wait for the halt to complete. */
-		wait_event(wq, raw3270_request_final(rq));
+		wait_event(raw3270_wait_queue, raw3270_request_final(rq));
 		return -ERESTARTSYS;
 	}
 	return rq->rc;
diff --git a/drivers/s390/char/sclp_config.c b/drivers/s390/char/sclp_config.c
index 9e784d5f7f5..ad05a87bc48 100644
--- a/drivers/s390/char/sclp_config.c
+++ b/drivers/s390/char/sclp_config.c
@@ -40,7 +40,7 @@ static void sclp_cpu_capability_notify(struct work_struct *work)
 	put_online_cpus();
 }
 
-static void sclp_cpu_change_notify(struct work_struct *work)
+static void __ref sclp_cpu_change_notify(struct work_struct *work)
 {
 	smp_rescan_cpus();
 }
diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c
index 35707c04e61..3e577f655b1 100644
--- a/drivers/s390/char/sclp_vt220.c
+++ b/drivers/s390/char/sclp_vt220.c
@@ -71,9 +71,6 @@ static struct list_head sclp_vt220_outqueue;
 /* Number of requests in outqueue */
 static int sclp_vt220_outqueue_count;
 
-/* Wait queue used to delay write requests while we've run out of buffers */
-static wait_queue_head_t sclp_vt220_waitq;
-
 /* Timer used for delaying write requests to merge subsequent messages into
  * a single buffer */
 static struct timer_list sclp_vt220_timer;
@@ -133,7 +130,6 @@ sclp_vt220_process_queue(struct sclp_vt220_request *request)
 	} while (request && __sclp_vt220_emit(request));
 	if (request == NULL && sclp_vt220_flush_later)
 		sclp_vt220_emit_current();
-	wake_up(&sclp_vt220_waitq);
 	/* Check if the tty needs a wake up call */
 	if (sclp_vt220_tty != NULL) {
 		tty_wakeup(sclp_vt220_tty);
@@ -383,7 +379,7 @@ sclp_vt220_timeout(unsigned long data)
  */
 static int
 __sclp_vt220_write(const unsigned char *buf, int count, int do_schedule,
-		   int convertlf, int may_schedule)
+		   int convertlf, int may_fail)
 {
 	unsigned long flags;
 	void *page;
@@ -395,15 +391,14 @@ __sclp_vt220_write(const unsigned char *buf, int count, int do_schedule,
 	overall_written = 0;
 	spin_lock_irqsave(&sclp_vt220_lock, flags);
 	do {
-		/* Create a sclp output buffer if none exists yet */
+		/* Create an sclp output buffer if none exists yet */
 		if (sclp_vt220_current_request == NULL) {
 			while (list_empty(&sclp_vt220_empty)) {
 				spin_unlock_irqrestore(&sclp_vt220_lock, flags);
-				if (in_interrupt() || !may_schedule)
-					sclp_sync_wait();
+				if (may_fail)
+					goto out;
 				else
-					wait_event(sclp_vt220_waitq,
-						!list_empty(&sclp_vt220_empty));
+					sclp_sync_wait();
 				spin_lock_irqsave(&sclp_vt220_lock, flags);
 			}
 			page = (void *) sclp_vt220_empty.next;
@@ -437,6 +432,7 @@ __sclp_vt220_write(const unsigned char *buf, int count, int do_schedule,
 		add_timer(&sclp_vt220_timer);
 	}
 	spin_unlock_irqrestore(&sclp_vt220_lock, flags);
+out:
 	return overall_written;
 }
 
@@ -520,19 +516,11 @@ sclp_vt220_close(struct tty_struct *tty, struct file *filp)
  * character to the tty device.  If the kernel uses this routine,
  * it must call the flush_chars() routine (if defined) when it is
  * done stuffing characters into the driver.
- *
- * NOTE: include/linux/tty_driver.h specifies that a character should be
- * ignored if there is no room in the queue. This driver implements a different
- * semantic in that it will block when there is no more room left.
- *
- * FIXME: putchar can currently be called from BH and other non blocking
- * handlers so  this semantic isn't a good idea.
  */
 static int
 sclp_vt220_put_char(struct tty_struct *tty, unsigned char ch)
 {
-	__sclp_vt220_write(&ch, 1, 0, 0, 1);
-	return 1;
+	return __sclp_vt220_write(&ch, 1, 0, 0, 1);
 }
 
 /*
@@ -653,7 +641,6 @@ static int __init __sclp_vt220_init(void)
 	spin_lock_init(&sclp_vt220_lock);
 	INIT_LIST_HEAD(&sclp_vt220_empty);
 	INIT_LIST_HEAD(&sclp_vt220_outqueue);
-	init_waitqueue_head(&sclp_vt220_waitq);
 	init_timer(&sclp_vt220_timer);
 	sclp_vt220_current_request = NULL;
 	sclp_vt220_buffered_chars = 0;
@@ -786,6 +773,7 @@ sclp_vt220_con_init(void)
 {
 	int rc;
 
+	INIT_LIST_HEAD(&sclp_vt220_register.list);
 	if (!CONSOLE_IS_SCLP)
 		return 0;
 	rc = __sclp_vt220_init();
diff --git a/drivers/s390/char/tape.h b/drivers/s390/char/tape.h
index dddf8d62c15..d0d565a05df 100644
--- a/drivers/s390/char/tape.h
+++ b/drivers/s390/char/tape.h
@@ -231,6 +231,9 @@ struct tape_device {
 	/* Request queue. */
 	struct list_head		req_queue;
 
+	/* Request wait queue. */
+	wait_queue_head_t		wait_queue;
+
 	/* Each tape device has (currently) two minor numbers. */
 	int				first_minor;
 
diff --git a/drivers/s390/char/tape_3590.c b/drivers/s390/char/tape_3590.c
index 8246ef3ab09..42ce7915fc5 100644
--- a/drivers/s390/char/tape_3590.c
+++ b/drivers/s390/char/tape_3590.c
@@ -1598,7 +1598,7 @@ tape_3590_setup_device(struct tape_device *device)
 	rc = tape_3590_read_dev_chars(device, rdc_data);
 	if (rc) {
 		DBF_LH(3, "Read device characteristics failed!\n");
-		goto fail_kmalloc;
+		goto fail_rdc_data;
 	}
 	rc = tape_std_assign(device);
 	if (rc)
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index ddc4a114e7f..95da72bc17e 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -179,11 +179,11 @@ tapeblock_requeue(struct work_struct *work) {
 			tapeblock_end_request(req, -EIO);
 			continue;
 		}
+		blkdev_dequeue_request(req);
+		nr_queued++;
 		spin_unlock_irq(&device->blk_data.request_queue_lock);
 		rc = tapeblock_start_request(device, req);
 		spin_lock_irq(&device->blk_data.request_queue_lock);
-		blkdev_dequeue_request(req);
-		nr_queued++;
 	}
 	spin_unlock_irq(&device->blk_data.request_queue_lock);
 	atomic_set(&device->blk_data.requeue_scheduled, 0);
diff --git a/drivers/s390/char/tape_core.c b/drivers/s390/char/tape_core.c
index 76e44eb7c47..c20e3c54834 100644
--- a/drivers/s390/char/tape_core.c
+++ b/drivers/s390/char/tape_core.c
@@ -449,6 +449,7 @@ tape_alloc_device(void)
 	INIT_LIST_HEAD(&device->req_queue);
 	INIT_LIST_HEAD(&device->node);
 	init_waitqueue_head(&device->state_change_wq);
+	init_waitqueue_head(&device->wait_queue);
 	device->tape_state = TS_INIT;
 	device->medium_state = MS_UNKNOWN;
 	*device->modeset_byte = 0;
@@ -954,21 +955,19 @@ __tape_wake_up(struct tape_request *request, void *data)
 int
 tape_do_io(struct tape_device *device, struct tape_request *request)
 {
-	wait_queue_head_t wq;
 	int rc;
 
-	init_waitqueue_head(&wq);
 	spin_lock_irq(get_ccwdev_lock(device->cdev));
 	/* Setup callback */
 	request->callback = __tape_wake_up;
-	request->callback_data = &wq;
+	request->callback_data = &device->wait_queue;
 	/* Add request to request queue and try to start it. */
 	rc = __tape_start_request(device, request);
 	spin_unlock_irq(get_ccwdev_lock(device->cdev));
 	if (rc)
 		return rc;
 	/* Request added to the queue. Wait for its completion. */
-	wait_event(wq, (request->callback == NULL));
+	wait_event(device->wait_queue, (request->callback == NULL));
 	/* Get rc from request */
 	return request->rc;
 }
@@ -989,20 +988,19 @@ int
 tape_do_io_interruptible(struct tape_device *device,
 			 struct tape_request *request)
 {
-	wait_queue_head_t wq;
 	int rc;
 
-	init_waitqueue_head(&wq);
 	spin_lock_irq(get_ccwdev_lock(device->cdev));
 	/* Setup callback */
 	request->callback = __tape_wake_up_interruptible;
-	request->callback_data = &wq;
+	request->callback_data = &device->wait_queue;
 	rc = __tape_start_request(device, request);
 	spin_unlock_irq(get_ccwdev_lock(device->cdev));
 	if (rc)
 		return rc;
 	/* Request added to the queue. Wait for its completion. */
-	rc = wait_event_interruptible(wq, (request->callback == NULL));
+	rc = wait_event_interruptible(device->wait_queue,
+				      (request->callback == NULL));
 	if (rc != -ERESTARTSYS)
 		/* Request finished normally. */
 		return request->rc;
@@ -1015,7 +1013,7 @@ tape_do_io_interruptible(struct tape_device *device,
 		/* Wait for the interrupt that acknowledges the halt. */
 		do {
 			rc = wait_event_interruptible(
-				wq,
+				device->wait_queue,
 				(request->callback == NULL)
 			);
 		} while (rc == -ERESTARTSYS);