Re: iwn, wpa_supplicant, and wpa2 enterprise

[Sverre Froyen <sverre%viewmark.com@localhost>]

On Thu June 3 2010 10:32:32 Pouya D. Tafti wrote:
...
> 
> uvm_fault(0xffffffff80ab21e0, 0xffff80200767a000, 1) -> e
> fatal page fault in supervisor mode
> trap type 6 code 0 rip ffffffff803ae51a cs 8 rflags 10286 cr2
> ffff80200767a1a0 cpl 6 rsp ffff80004e1428f0
> kernel: page fault trap, code=0
> Stopped in pid 110.1 (wpa_supplicant) at        netbsd:kern_free+0x2d:
>  movzwl  0
> (%rbx),%r12d
> db {3}> t
> kern_free() at netbsd:kern_free+0x2d
> iwn_init()  at netbsd:iwn_init+0x368
> iwn_ioctl() at netbsd:iwn_ioctl+0xe4
> ifioctl() at netbsd:ifioctl()+0x1e4
> soo_ioctl() at netbsd:soo_ioctl+0x2a5
> sys_ioctl() at netbsd:sys_ioctl+0xe9
> syscall() at netbsd:syscall+0xaa

There are some recent patches to the OpenBSD driver that might be relevant. In 
particular:

--------------------------------------------------------------------------------------
Revision 1.94: download - view: text, markup, annotated - select for diffs
 Wed May 5 19:47:43 2010 UTC (4 weeks ago) by damien
 Branches: MAIN
 Diff to: previous 1.93: preferred, coloured
 Changes since revision 1.93: +9 -0 lines
 
Prevent a process from entering iwn_ioctl while another process is
tsleep'ing (for example waiting for the firmware to become alive)
in iwn_init.

I believe this might fix a crash reported by dhill@
This is a temporary fix until I find something better that I will
apply to my other drivers that can tsleep in if_init (wpi, run etc...)
--------------------------------------------------------------------------------------

I'll merge the changes and provide a patch.

Regards,
Sverre