Re: sx driver, DCD-HylaFAX problem solved

From: Heinz-Ado Arnolds (Ado.Arnolds@dhm-systems.de)
Date: Fri Dec 21 2001 - 04:13:42 EST

Rogier Wolff wrote:
>
...
> Please Email Marcello, Linus and linux-kernel with this patch, and
> state that you are submitting this patch on my request for inclusion
> in the standard kernel.
>
> Roger.

Hi Marcelo, hi Linus, hi Alan,

I'm sending you this patch to the specialix sx driver on the request
of Roger E. Wolf. It fixes a long outstanding problem with hangup when
a DCD change is detected by the driver. The CLOCAL in c_cflag was
ignored. The problem shows up in connection with HylaFAX and gettys.

Please insert this patch into the next available kernel releases.
The patch is to linux-2.4.16, but this section of the sx driver
didn't change at least since 2.2.19.

Thanks a lot for your attention.

Ado

-------------------------------------------------------------------------

--- linux/drivers/char/sx.c.~1~ Fri Nov 9 23:01:21 2001
+++ linux/drivers/char/sx.c Thu Dec 20 17:22:53 2001
@@ -1160,7 +1160,8 @@
                                 /* DCD went UP */
                                 if( (~(port->gs.flags & ASYNC_NORMAL_ACTIVE) ||
                                                  ~(port->gs.flags & ASYNC_CALLOUT_ACTIVE)) &&
- (sx_read_channel_byte(port, hi_hstat) != HS_IDLE_CLOSED)) {
+ (sx_read_channel_byte(port, hi_hstat) != HS_IDLE_CLOSED) &&
+ !(port->gs.tty->termios->c_cflag & CLOCAL) ) {
                                         /* Are we blocking in open?*/
                                         sx_dprintk (SX_DEBUG_MODEMSIGNALS, "DCD active, unblocking
open\n");
                                         wake_up_interruptible(&port->gs.open_wait);
@@ -1170,7 +1171,8 @@
                         } else {
                                 /* DCD went down! */
                                 if (!((port->gs.flags & ASYNC_CALLOUT_ACTIVE) &&
- (port->gs.flags & ASYNC_CALLOUT_NOHUP))) {
+ (port->gs.flags & ASYNC_CALLOUT_NOHUP)) &&
+ !(port->gs.tty->termios->c_cflag & CLOCAL) ) {
                                         sx_dprintk (SX_DEBUG_MODEMSIGNALS, "DCD dropped. hanging
up....\n");
                                         tty_hangup (port->gs.tty);
                                 } else { 

-- 
------------------------------------------------------------------------
  Heinz-Ado Arnolds                        Ado.Arnolds@web-systems.net
  Websystems GmbH                              +49 2234 1840-0 (voice)
  Max-Planck-Strasse 2, 50858 Koeln, Germany   +49 2234 1840-40  (fax)
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This archive was generated by hypermail 2b29 : Sun Dec 23 2001 - 21:00:24 EST