5 files changed, 18 insertions, 7 deletions

diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 2b86f8e0fb58..71630a2af42c 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -1855,6 +1855,9 @@ static struct console sercons = {
  */
 static int __init amiserial_console_init(void)
 {
+        if (!MACH_IS_AMIGA)
+                return -ENODEV;
+
         register_console(&sercons);
         return 0;
 }
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 7cdd1eb9406c..0f74945af624 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -768,7 +768,7 @@ static size_t __process_echoes(struct tty_struct *tty)
          * data at the tail to prevent a subsequent overrun */
         while (ldata->echo_commit - tail >= ECHO_DISCARD_WATERMARK) {
                 if (echo_buf(ldata, tail) == ECHO_OP_START) {
-                        if (echo_buf(ldata, tail) == ECHO_OP_ERASE_TAB)
+                        if (echo_buf(ldata, tail + 1) == ECHO_OP_ERASE_TAB)
                                 tail += 3;
                         else
                                 tail += 2;
@@ -1998,7 +1998,10 @@ static int canon_copy_from_read_buf(struct tty_struct *tty,
                 found = 1;
 
         size = N_TTY_BUF_SIZE - tail;
-        n = (found + eol + size) & (N_TTY_BUF_SIZE - 1);
+        n = eol - tail;
+        if (n > 4096)
+                n += 4096;
+        n += found;
         c = n;
 
         if (found && read_buf(ldata, eol) == __DISABLED_CHAR) {
@@ -2243,18 +2246,19 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
                 if (time)
                         timeout = time;
         }
-        mutex_unlock(&ldata->atomic_read_lock);
-        remove_wait_queue(&tty->read_wait, &wait);
+        n_tty_set_room(tty);
+        up_read(&tty->termios_rwsem);
 
+        remove_wait_queue(&tty->read_wait, &wait);
         if (!waitqueue_active(&tty->read_wait))
                 ldata->minimum_to_wake = minimum;
 
+        mutex_unlock(&ldata->atomic_read_lock);
+
         __set_current_state(TASK_RUNNING);
         if (b - buf)
                 retval = b - buf;
 
-        n_tty_set_room(tty);
-        up_read(&tty->termios_rwsem);
         return retval;
 }
 
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index f3b306efaa59..23329918f229 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -41,7 +41,7 @@ config SERIAL_8250_DEPRECATED_OPTIONS
           accept kernel parameters in both forms like 8250_core.nr_uarts=4 and
           8250.nr_uarts=4. We now renamed the module back to 8250, but if
           anybody noticed in 3.7 and changed their userspace we still have to
-          keep the 8350_core.* options around until they revert the changes
+          keep the 8250_core.* options around until they revert the changes
           they already did.
 
           If 8250 is built as a module, this adds 8250_core alias instead. 
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index 481b781b26e3..e9d420ff3931 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -2052,6 +2052,9 @@ static int __init pmz_console_init(void)
         /* Probe ports */
         pmz_probe();
 
+        if (pmz_ports_count == 0)
+                return -ENODEV;
+
         /* TODO: Autoprobe console based on OF */
         /* pmz_console.index = i; */
         register_console(&pmz_console);
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 3a1a01af9a80..c74a00ad7add 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2086,6 +2086,7 @@ retry_open:
                         filp->f_op = &tty_fops;
                 goto retry_open;
         }
+        clear_bit(TTY_HUPPED, &tty->flags);
         tty_unlock(tty);