[PATCH] use correct wakeups in fs/pipe.c

wake_up_interruptible() and _sync() calls are reversed in pipe_read().

The attached patches only calls _sync if a schedule() call follows.

fs/pipe.c

@@ -109,7 +109,7 @@ pipe_read(struct file *filp, char *buf, size_t count, loff_t *ppos)
 			break;
 		}
 		if (do_wakeup) {
-			wake_up_interruptible(PIPE_WAIT(*inode));
+			wake_up_interruptible_sync(PIPE_WAIT(*inode));
  			kill_fasync(PIPE_FASYNC_WRITERS(*inode), SIGIO, POLL_OUT);
 		}
 		pipe_wait(inode);
@@ -117,7 +117,7 @@ pipe_read(struct file *filp, char *buf, size_t count, loff_t *ppos)
 	up(PIPE_SEM(*inode));
 	/* Signal writers asynchronously that there is more room.  */
 	if (do_wakeup) {
-		wake_up_interruptible_sync(PIPE_WAIT(*inode));
+		wake_up_interruptible(PIPE_WAIT(*inode));
 		kill_fasync(PIPE_FASYNC_WRITERS(*inode), SIGIO, POLL_OUT);
 	}
 	if (ret > 0)