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authorAlan Cox <alan@linux.intel.com>2009-11-05 13:27:57 +0000
committerGreg Kroah-Hartman <gregkh@suse.de>2009-12-11 15:18:05 -0800
commite707c35cbbe83a016cf0122a29e3a47b5a9e35c4 (patch)
tree5e0761f8e65d247f63785f5afc42623dc1291cd9 /drivers
parentedfacdd6f81119b9005615593f2cbd94b8c7e2d8 (diff)
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tty_port: Move hupcl handling
Move the HUCPL handling from the end of close_port_start to the beginning of close_port_end. What this actually does is change the ordering from port shutdown port->dtr_rts to port->dtr_rts port shutdown Some hardware drops the physical connection on shutdown so we must perform the port operations before the shutdown. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/tty_port.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index 41b314cfda4..dd471d63fae 100644
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -339,6 +339,14 @@ int tty_port_close_start(struct tty_port *port,
timeout = 2 * HZ;
schedule_timeout_interruptible(timeout);
}
+ /* Flush the ldisc buffering */
+ tty_ldisc_flush(tty);
+
+ /* Drop DTR/RTS if HUPCL is set. This causes any attached modem to
+ hang up the line */
+ if (tty->termios->c_cflag & HUPCL)
+ tty_port_lower_dtr_rts(port);
+
/* Don't call port->drop for the last reference. Callers will want
to drop the last active reference in ->shutdown() or the tty
shutdown path */
@@ -350,11 +358,6 @@ void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)
{
unsigned long flags;
- tty_ldisc_flush(tty);
-
- if (tty->termios->c_cflag & HUPCL)
- tty_port_lower_dtr_rts(port);
-
spin_lock_irqsave(&port->lock, flags);
tty->closing = 0;