serial: fix serial_cs I/O windows for Argosy RS-COM 2P

Current serial_cs driver has a problem when trying to detect whether
a card has multiple ports: serial_config() calls pcmcia_loop_config()
which iterates over card CIS configurations by calling
serial_check_for_multi() for each of them.

This function wants to check (and select) a configuration
that has either one long I/O window spanning multiple ports or two 8-port
windows for two serial ports.

Problem is, that every pcmcia_loop_config() iteration only updates
the windows (via pcmcia_do_loop_config() in resource[0] and resource[1])
when CONF_AUTO_SET_IO flag is set on the device, which is set only later
in the code.

Fix it by setting this flag earlier.

In addition to this, when multi-port card is detected
and it does not have an one, long I/O window
multi_config_check_notpicky() tries to locate two I/O windows and assumes
they are continuous without checking.

On an Argosy RS-COM 2P this selects first configuration, which
unfortunately has two non-continuous I/O windows.
The net effect is that the second serial port on the card does not work.

Fix it by checking whether the windows are really continuous.

Signed-off-by: Maciej Szmigiero <mhej@o2.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/tty/serial/serial_cs.c b/drivers/tty/serial/serial_cs.c
index eef736ff810a..86090605a84e 100644
--- a/drivers/tty/serial/serial_cs.c
+++ b/drivers/tty/serial/serial_cs.c
@@ -317,7 +317,7 @@ static int serial_probe(struct pcmcia_device *link)
         info->p_dev = link;
         link->priv = info;
 
-        link->config_flags |= CONF_ENABLE_IRQ;
+        link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
         if (do_sound)
                 link->config_flags |= CONF_ENABLE_SPKR;
 
@@ -445,7 +445,7 @@ static int simple_config(struct pcmcia_device *link)
 
         /* First pass: look for a config entry that looks normal.
          * Two tries: without IO aliases, then with aliases */
-        link->config_flags |= CONF_AUTO_SET_VPP | CONF_AUTO_SET_IO;
+        link->config_flags |= CONF_AUTO_SET_VPP;
         for (try = 0; try < 4; try++)
                 if (!pcmcia_loop_config(link, simple_config_check, &try))
                         goto found_port;
@@ -501,7 +501,8 @@ static int multi_config_check_notpicky(struct pcmcia_device *p_dev,
 {
         int *base2 = priv_data;
 
-        if (!p_dev->resource[0]->end || !p_dev->resource[1]->end)
+        if (!p_dev->resource[0]->end || !p_dev->resource[1]->end ||
+                p_dev->resource[0]->start + 8 != p_dev->resource[1]->start)
                 return -ENODEV;
 
         p_dev->resource[0]->end = p_dev->resource[1]->end = 8;
@@ -520,7 +521,6 @@ static int multi_config(struct pcmcia_device *link)
         struct serial_info *info = link->priv;
         int i, base2 = 0;
 
-        link->config_flags |= CONF_AUTO_SET_IO;
         /* First, look for a generic full-sized window */
         if (!pcmcia_loop_config(link, multi_config_check, &info->multi))
                 base2 = link->resource[0]->start + 8;