[PATCH] ipaq.c bugfixes

[Frank Gevaerts <frank.gevaerts@fks.be>]

This patch fixes several problems in the ipaq.c driver with connecting
and disconnecting pocketpc devices: 
* The read urb stayed active if the connect failed, causing nullpointer
  dereferences later on. 
* If a write failed, the driver continued as if nothing happened. Now it
  handles that case the same way as other usb serial devices (fix by 
  "Luiz Fernando N. Capitulino" <lcapitulino@mandriva.com.br>)

The connect_retries parameter is added because if a pocketpc device is
connected while it is rebooting, it can take a long time after the USB
connect (sometimes several minutes) before it starts accepting the
control packet that starts the serial connection. Since this is not the
normal usecase, it is probably better to leave the default number of
retries as-is.

Signed-off-by: Frank Gevaerts <frank.gevaerts@fks.be>

diff -pur linux-2.6.17-rc4/drivers/usb/serial/ipaq.c linux-2.6.17-rc4.test/drivers/usb/serial/ipaq.c
--- linux-2.6.17-rc4/drivers/usb/serial/ipaq.c	2006-03-20 06:53:29.000000000 +0100
+++ linux-2.6.17-rc4.test/drivers/usb/serial/ipaq.c	2006-05-30 20:46:23.000000000 +0200
@@ -71,6 +71,7 @@
 
 static __u16 product, vendor;
 static int debug;
+static int connect_retries;
 
 /* Function prototypes for an ipaq */
 static int  ipaq_open (struct usb_serial_port *port, struct file *filp);
@@ -583,7 +584,7 @@ static int ipaq_open(struct usb_serial_p
 	struct ipaq_private	*priv;
 	struct ipaq_packet	*pkt;
 	int			i, result = 0;
-	int			retries = KP_RETRIES;
+	int			retries = connect_retries;
 
 	dbg("%s - port %d", __FUNCTION__, port->number);
 
@@ -681,6 +682,7 @@ enomem:
 	result = -ENOMEM;
 	err("%s - Out of memory", __FUNCTION__);
 error:
+	usb_kill_urb(port->read_urb);
 	ipaq_destroy_lists(port);
 	kfree(priv);
 	return result;
@@ -855,6 +857,7 @@ static void ipaq_write_bulk_callback(str
 	
 	if (urb->status) {
 		dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
+		return;
 	}
 
 	spin_lock_irqsave(&write_list_lock, flags);
@@ -967,3 +970,6 @@ MODULE_PARM_DESC(vendor, "User specified
 
 module_param(product, ushort, 0);
 MODULE_PARM_DESC(product, "User specified USB idProduct");
+
+module_param(connect_retries, int, KP_RETRIES);
+MODULE_PARM_DESC(product, "Maximum number of connect retries (100ms each)");

-- 
Frank Gevaerts                                 frank.gevaerts@fks.be
fks bvba - Formal and Knowledge Systems        http://www.fks.be/
Stationsstraat 108                             Tel:  ++32-(0)11-21 49 11
B-3570 ALKEN                                   Fax:  ++32-(0)11-22 04 19