[Bug 227437] iwn 6235 0x5260

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227437

            Bug ID: 227437
           Summary: iwn 6235 0x5260
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: wireless
          Assignee: wireless at FreeBSD.org
          Reporter: bsd at haps.ca

Created attachment 192426
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=192426&action=edit
the list of iwn errors dumped to dmesg/console

Hi, I recently purchased a lenovo-"branded" (has a lenovo fru part number) 6235
wireless card for my Thinkpad T440p.  This was a downgrade from the stock 7260
in the hopes that iwn support would be better than iwm.  However, the sub-id
for this card is not supported.  This is the same card that the original poster
in this thread had:
https://lists.freebsd.org/pipermail/freebsd-wireless/2014-December/005262.html

I added the sub-id, recompiled, and the card seems to work, but the driver
panics and restarts.  I'm back on the 7260 but I'm happy to test any proposed
fixes.  The change I made isn't patch-worthy, I just added a new line in
if_iwn_devid.h:
+#define        IWN_SDID_6035_5         0x5260
and add a case in if_iwn.c for that ID.

The error message that was logged is attached, also this is the detection line
from dmesg:
iwn0: <Intel Centrino Advanced 6235> mem 0xf0400000-0xf0401fff irq 17 at device
0.0 on pci
iwn0: iwn_read_firmware: ucode rev=0x12a80601

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