diff options
Diffstat (limited to 'drivers/tty/tty_io.c')
| -rw-r--r-- | drivers/tty/tty_io.c | 35 |
1 files changed, 19 insertions, 16 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 3d540dff42ef..d5191065b6e9 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -956,7 +956,7 @@ void tty_write_unlock(struct tty_struct *tty) wake_up_interruptible_poll(&tty->write_wait, EPOLLOUT); } -int tty_write_lock(struct tty_struct *tty, int ndelay) +int tty_write_lock(struct tty_struct *tty, bool ndelay) { if (!mutex_trylock(&tty->atomic_write_lock)) { if (ndelay) @@ -1173,7 +1173,7 @@ int tty_send_xchar(struct tty_struct *tty, char ch) return 0; } - if (tty_write_lock(tty, 0) < 0) + if (tty_write_lock(tty, false) < 0) return -ERESTARTSYS; down_read(&tty->termios_rwsem); @@ -2504,22 +2504,25 @@ static int send_break(struct tty_struct *tty, unsigned int duration) return 0; if (tty->driver->flags & TTY_DRIVER_HARDWARE_BREAK) - retval = tty->ops->break_ctl(tty, duration); - else { - /* Do the work ourselves */ - if (tty_write_lock(tty, 0) < 0) - return -EINTR; - retval = tty->ops->break_ctl(tty, -1); - if (retval) - goto out; - if (!signal_pending(current)) - msleep_interruptible(duration); + return tty->ops->break_ctl(tty, duration); + + /* Do the work ourselves */ + if (tty_write_lock(tty, false) < 0) + return -EINTR; + + retval = tty->ops->break_ctl(tty, -1); + if (!retval) { + msleep_interruptible(duration); retval = tty->ops->break_ctl(tty, 0); -out: - tty_write_unlock(tty); - if (signal_pending(current)) - retval = -EINTR; + } else if (retval == -EOPNOTSUPP) { + /* some drivers can tell only dynamically */ + retval = 0; } + tty_write_unlock(tty); + + if (signal_pending(current)) + retval = -EINTR; + return retval; } |