Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux

[linux-drm-fsl-dcu.git] / drivers / tty / n_tty.c

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 7cdd1eb9406c11ccb4870560490f0c6036f92032..0f74945af624962266803ce242ef10509906a6a4 100644 (file)
--- 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;
 }