Allow uninterruptible wait for pending IOs.

Add argument "interruptible" to dm_wait_for_completion that specifies
either interruptible or uninterruptible waiting.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

---
 drivers/md/dm.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Index: linux-2.6.28-clean/drivers/md/dm.c
===================================================================
--- linux-2.6.28-clean.orig/drivers/md/dm.c	2009-01-12 15:17:11.000000000 +0100
+++ linux-2.6.28-clean/drivers/md/dm.c	2009-01-12 15:17:14.000000000 +0100
@@ -1331,7 +1331,7 @@ void dm_put(struct mapped_device *md)
 }
 EXPORT_SYMBOL_GPL(dm_put);
 
-static int dm_wait_for_completion(struct mapped_device *md)
+static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
 {
 	int r = 0;
 	DECLARE_WAITQUEUE(wait, current);
@@ -1341,13 +1341,13 @@ static int dm_wait_for_completion(struct
 	add_wait_queue(&md->wait, &wait);
 
 	while (1) {
-		set_current_state(TASK_INTERRUPTIBLE);
+		set_current_state(interruptible);
 
 		smp_mb();
 		if (!atomic_read(&md->pending))
 			break;
 
-		if (signal_pending(current)) {
+		if (interruptible == TASK_INTERRUPTIBLE && signal_pending(current)) {
 			r = -EINTR;
 			break;
 		}
@@ -1521,7 +1521,7 @@ int dm_suspend(struct mapped_device *md,
 	/*
 	 * Wait for the already-mapped ios to complete.
 	 */
-	r = dm_wait_for_completion(md);
+	r = dm_wait_for_completion(md, TASK_INTERRUPTIBLE);
 
 	down_write(&md->io_lock);