RE: usb_submit_urb errors

This is really disturbing.  I went through and determined that the -ENOMEM
was not coming from net/core/dev.c as I thought it was.  So, I went through
at76c503.c and looked for all possible places that there could be an -ENOMEM
returned and I added this:

	printk("chrisp: kmalloc failed in " __FILE__ ", line %d\n", __LINE);

recompiled it, and it started WORKING.  I never saw any of the debug
messages fire.  When I say it works, I mean it completely works - it
associates with the AP and dhcp gets an address, WEP is working, it's full
connectable.  It's even happy talking to my dhcp server.

Next, I went back into at76c503.c and put // in front of all the printk
statements that I added (to comment them out), compiled it, and it STILL
works.

I'm mystified.  Compared with what's in CVS, the only thing that is
different is an extra commented-out printk, and some braces that I had to
add a couple of places.  For example:

        if (!hwcfg)
                return -ENOMEM;

was changed to:

        if (!hwcfg) {
                // printk("chrisp: kalloc() " __FILE__ ":%d\n", __LINE__);
                return -ENOMEM;
        }

(I added braces).

What the ... ?  Have any of you ever seen anything like this?  Is it
worthwhile to try removing them all one by one and see what happens?  I am
reluctant to blame it on the compiler, because every time I blame it on the
compiler I later find out that it was somehow my own fault.

--Chris



-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Joerg Albert
Sent: Saturday, April 03, 2004 4:01 PM
To: [email protected]
Subject: Re: [at76c503a-user] usb_submit_urb errors


Hi,

On Sat, 3 Apr 2004, Christopher Piggott HOME wrote:

> Have any of you ever seen this?  It happens when I try to do an ifconfig
> wlan0 with an IP address.
>
> /root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
> /root/at76c503a/at76c503.c: wlan0: open: submit_rx_urb failed: -12
> /root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
> /root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
> /root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
> /root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
> /root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
> /root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
> /root/at76c503a/at76c503.c: wlan0: rx, usb_submit_urb failed: -12
> /root/at76c503a/at76c503.c: wlan0: giving up to submit rx urb after 8
> failures - please unload the driver and/or power cycle the device

-12 is -ENOMEM, seems like the submit_urb of your host controller cannot
alloc enough memory. No idea why. Maybe CONFIG_USB_DEBUG in .config will
reveal more info.

/Jörg
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