From f61051cd2fc58546f28c226933942d4360810ffb Mon Sep 17 00:00:00 2001 From: Russell King Date: Sat, 7 Jan 2006 23:11:23 +0000 Subject: [PATCH] [SERIAL] Fix clocal wakeup problem Jim Alexander reported a problem where "if one calls open() in blocking mode with CLOCAL off, the 8250.c driver under the 2.6 kernel (or at least 2.6.8 and 2.6.10) does not wake up the blocked process when DCD is asserted." Fix this by enabling modem status interrupts immediately before we read the carrier detect status. Thanks to Jim for reporting the problem and testing the fix. Signed-off-by: Russell King --- drivers/serial/serial_core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index 34c576dfad..9589509fc5 100644 --- a/drivers/serial/serial_core.c +++ b/drivers/serial/serial_core.c @@ -1440,6 +1440,7 @@ uart_block_til_ready(struct file *filp, struct uart_state *state) * modem is ready for us. */ spin_lock_irq(&port->lock); + port->ops->enable_ms(port); mctrl = port->ops->get_mctrl(port); spin_unlock_irq(&port->lock); if (mctrl & TIOCM_CAR) -- 2.39.5