diff options
| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2006-01-07 23:11:23 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-01-07 23:11:23 +0000 |
| commit | f61051cd2fc58546f28c226933942d4360810ffb (patch) | |
| tree | bac31cc9c3c857d21b1b084260f443ebc8d25e6c /drivers/serial | |
| parent | b9abaa3fb7328851bdeaad19e694048f0ff71d9a (diff) | |
[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 <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/serial_core.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index 34c576dfad8..9589509fc5b 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) |