1 files changed, 8 insertions, 6 deletions

diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
index 5a8a4c28c867..09676b4e5d89 100644
--- a/drivers/char/hvc_console.c
+++ b/drivers/char/hvc_console.c
@@ -318,7 +318,8 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
         } /* else count == 0 */
 
         tty->driver_data = hp;
-        tty->low_latency = 1; /* Makes flushes to ldisc synchronous. */
+        if (!hp->irq_requested)
+                tty->low_latency = 1; /* Makes flushes to ldisc synchronous. */
 
         hp->tty = tty;
 
@@ -764,13 +765,11 @@ struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int data,
                         return ERR_PTR(err);
         }
 
-        hp = kmalloc(ALIGN(sizeof(*hp), sizeof(long)) + outbuf_size,
+        hp = kzalloc(ALIGN(sizeof(*hp), sizeof(long)) + outbuf_size,
                         GFP_KERNEL);
         if (!hp)
                 return ERR_PTR(-ENOMEM);
 
-        memset(hp, 0x00, sizeof(*hp));
-
         hp->vtermno = vtermno;
         hp->data = data;
         hp->ops = ops;
@@ -876,8 +875,11 @@ static int hvc_init(void)
                 goto stop_thread;
         }
 
-        /* FIXME: This mb() seems completely random.  Remove it. */
-        mb();
+        /*
+         * Make sure tty is fully registered before allowing it to be
+         * found by hvc_console_device.
+         */
+        smp_mb();
         hvc_driver = drv;
         return 0;