diff options
author | Alan Cox <alan@linux.intel.com> | 2010-06-02 00:53:00 +0400 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-11 00:47:42 +0400 |
commit | 74c2107759dc6efaa1b9127014be58a742a1e7ac (patch) | |
tree | 0e453f7768ede123c108b3104a098375bec6a0b4 /drivers/serial/serial_core.c | |
parent | 24fcc7c8cd0fcabcf37d455abe3501b3196fcf64 (diff) | |
download | linux-74c2107759dc6efaa1b9127014be58a742a1e7ac.tar.xz |
serial: Use block_til_ready helper
Our code now rather closely resembles the helper, so switch to it.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/serial/serial_core.c')
-rw-r--r-- | drivers/serial/serial_core.c | 87 |
1 files changed, 1 insertions, 86 deletions
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index 0603e0d46d33..a55751a12c38 100644 --- a/drivers/serial/serial_core.c +++ b/drivers/serial/serial_core.c @@ -1526,91 +1526,6 @@ static void uart_dtr_rts(struct tty_port *port, int onoff) uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); } -/* - * Block the open until the port is ready. We must be called with - * the per-port semaphore held. - */ -static int -uart_block_til_ready(struct file *filp, struct uart_state *state) -{ - DECLARE_WAITQUEUE(wait, current); - struct tty_port *port = &state->port; - unsigned long flags; - - spin_lock_irqsave(&port->lock, flags); - if (!tty_hung_up_p(filp)) - port->count--; - port->blocked_open++; - spin_unlock_irqrestore(&port->lock, flags); - - add_wait_queue(&port->open_wait, &wait); - while (1) { - set_current_state(TASK_INTERRUPTIBLE); - - /* - * If we have been hung up, tell userspace/restart open. - */ - if (tty_hung_up_p(filp) || port->tty == NULL) - break; - - /* - * If the port has been closed, tell userspace/restart open. - */ - if (!(port->flags & ASYNC_INITIALIZED)) - break; - - /* - * If non-blocking mode is set, or CLOCAL mode is set, - * we don't want to wait for the modem status lines to - * indicate that the port is ready. - * - * Also, if the port is not enabled/configured, we want - * to allow the open to succeed here. Note that we will - * have set TTY_IO_ERROR for a non-existant port. - */ - if ((filp->f_flags & O_NONBLOCK) || - (port->tty->termios->c_cflag & CLOCAL) || - (port->tty->flags & (1 << TTY_IO_ERROR))) - break; - - /* - * Set DTR to allow modem to know we're waiting. Do - * not set RTS here - we want to make sure we catch - * the data from the modem. - */ - if (port->tty->termios->c_cflag & CBAUD) - tty_port_raise_dtr_rts(port); - - /* - * and wait for the carrier to indicate that the - * modem is ready for us. - */ - if (tty_port_carrier_raised(port)) - break; - - schedule(); - - if (signal_pending(current)) - break; - } - set_current_state(TASK_RUNNING); - remove_wait_queue(&port->open_wait, &wait); - - spin_lock_irqsave(&port->lock, flags); - if (!tty_hung_up_p(filp)) - port->count++; - port->blocked_open--; - spin_unlock_irqrestore(&port->lock, flags); - - if (signal_pending(current)) - return -ERESTARTSYS; - - if (!port->tty || tty_hung_up_p(filp)) - return -EAGAIN; - - return 0; -} - static struct uart_state *uart_get(struct uart_driver *drv, int line) { struct uart_state *state; @@ -1719,7 +1634,7 @@ static int uart_open(struct tty_struct *tty, struct file *filp) */ mutex_unlock(&port->mutex); if (retval == 0) - retval = uart_block_til_ready(filp, state); + retval = tty_port_block_til_ready(port, tty, filp); /* * If this is the first open to succeed, adjust things to suit. |