On Fri, Jul 10, 2009 at 12:30:51PM -0700, Elwood C. Downey wrote:
> Hello all,
>
> I have a problem with a PCI char driver. I would appreciate any pointers on how to proceed.
>
> Basically, I have a PCI char driver that worked under 2.6.13 and does not work under
> 2.6.22. The system is a 1.8 GHz Intel SBC (single-board computer) with 2GB RAM. There is
> no disk, just a 32 GB Flash drive. I did the original development on an Intel desktop
> running 2.6.13. I temporarily connected the IDE disk from that desktop to the SBC and
> everything works fine that way so it doesn't appear to be the hardware, although I
> suppose it's possible the flash-based configuration might be an issue in some way.
> Unfortunately, changing the Flash to use 2.6.22 is not an option for reasons unrelated.
>
> Anyway, insmod loads the module just fine. It is listed by lsmod; "lspci -v" shows the
> device addresses and correct module; and its char device, /dev/ik220, is created
> correctly. But the first time an app calls open ("/dev/ik220", O_RDWR) the kernel
> crashes flat immediately. I put a printk in the open file_operations and it does even
> get into the open (or at least there is nothing in /var/log/syslog after a reboot).
>
> Since it loaded OK I figured the probe code was setting up for some future problem. So I
> gutted all the probe code and added it back slowly. I found that the open would not
> crash until I added the first call to ioremap(). That call itself claims to succeed but
> evidently sets up for later disaster.
>
> I actually don't really need an open entry, just ioctl is fine, but I added one with
> just a printk to see what would happen. The same thing happens in the ioctl: it never
> gets called because the kernel crashes.
>
> I've put a copy of the driver at http://www.clearskyinstitute.com/ik220. Any thoughts
> would be appreciated.
What is the license of this driver?
All I see is:
MODULE_LICENSE ("LOOK AT FILE : Describe.txt");
and there is no "Describe.txt" in the location above :)
Any ideas?
thanks,
greg k-h
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