Re: [RESEND] [PATCH 2/2] ipaq.c timing parameters

[Frank Gevaerts]

On Mon, Jun 19, 2006 at 01:42:40PM -0300, Luiz Fernando N. Capitulino wrote:
> On Mon, 19 Jun 2006 10:46:19 +0200
> Frank Gevaerts <frank.gevaerts@xxxxxx> wrote:
> 
> | Adds configurable waiting periods to the ipaq connection code. These are
> | not needed when the pocketpc device is running normally when plugged in,
> | but they need extra delays if they are physically connected while
> | rebooting.
> | There are two parameters :
> | * initial_wait : this is the delay before the driver attemts to start the
> |   connection. This is needed because the pocktpc device takes much
> |   longer to boot if the driver starts sending control packets too soon.
> | * connect_retries : this is the number of times the control urb is
> |   retried before finally giving up. The patch also adds a 1 second delay
> |   between retries.
> | I'm not sure if the cases where this patch is useful are general enough
> | to include this in the kernel.
> | 
> | Signed-off-by: Frank Gevaerts <frank.gevaerts@xxxxxx>
> | 
> | diff -urp linux-2.6.17-rc6.a/drivers/usb/serial/ipaq.c linux-2.6.17-rc6.b/drivers/usb/serial/ipaq.c
> | --- linux-2.6.17-rc6.a/drivers/usb/serial/ipaq.c	2006-06-14 16:02:03.000000000 +0200
> | +++ linux-2.6.17-rc6.b/drivers/usb/serial/ipaq.c	2006-06-14 16:06:44.000000000 +0200
> | @@ -71,6 +71,8 @@
> |  
> |  static __u16 product, vendor;
> |  static int debug;
> | +static int connect_retries = KP_RETRIES;
> | +static int initial_wait;
> |  
> |  /* Function prototypes for an ipaq */
> |  static int  ipaq_open (struct usb_serial_port *port, struct file *filp);
> | @@ -583,7 +585,7 @@ 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);
> |  
> | @@ -647,6 +649,7 @@ static int ipaq_open(struct usb_serial_p
> |  	port->read_urb->transfer_buffer_length = URBDATA_SIZE;
> |  	port->bulk_out_size = port->write_urb->transfer_buffer_length = URBDATA_SIZE;
> |  	
> | +	msleep(1000*initial_wait);
> 
>  I was going to say you should use ssleep() here, but I can't find a
> ssleep_interruptible(). Then either: use msleep_interruptible() or
> creates a new ssleep_interruptible().

I wasn't sure if that was safe here, so I used the non-interruptible
version. I'll change it when I redo the patch.
Is it worth it creating ssleep_interruptible() just for this one call?

> |  	/* Start reading from the device */
> |  	usb_fill_bulk_urb(port->read_urb, serial->dev, 
> |  		      usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
> | @@ -673,6 +676,7 @@ static int ipaq_open(struct usb_serial_p
> |  			}
> |  			return 0;
> |  		}
> | +		msleep(1000);
> |  	}
> 
>  Don't you want msleep(100); here?

The currently running version has 1000. 100 is probably better.

I'll submit a new patch once it's clear which version of the first patch
goes in.

> 
> -- 
> Luiz Fernando N. Capitulino

-- 
Frank Gevaerts                                 frank.gevaerts@xxxxxx
fks bvba - Formal and Knowledge Systems        http://www.fks.be/
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