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Subject[PATCH] ipaq.c bugfixes
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" <>)

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 <>

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__);
+ usb_kill_urb(port->read_urb);
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
fks bvba - Formal and Knowledge Systems
Stationsstraat 108 Tel: ++32-(0)11-21 49 11
B-3570 ALKEN Fax: ++32-(0)11-22 04 19
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