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[regression][bisected] Handling of channel contexts causes wireless to fail (i.e. no wlan* devices)

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The following commit causes wireless interfaces to not show up (i.e.
wlan* is non existant):

fe57d9f: mac80211: track whether to use channel contexts

Reverting this commit on top of current wireless-testing resulted in
undefined references to chanctx.

I have observed this behaviour on two chipsets on two seperate systems
(desktop and laptop):

- rt2860pci
05:08.0 Network controller: Ralink corp. RT2800 802.11n PCI
	Subsystem: SiteCom Europe BV Device 0016
	Flags: bus master, slow devsel, latency 32, IRQ 18
05:08.0 0280: 1814:0601
	Subsystem: 182d:0016
- b43
03:00.0 Network controller: Broadcom Corporation BCM4311 802.11b/g WLAN (rev 01)
	Subsystem: Hewlett-Packard Company BCM4311 802.11b/g Wireless LAN Controller
03:00.0 0280: 14e4:4311 (rev 01)
	Subsystem: 103c:1364

[    0.190034] ssb: Found chip with id 0x4311, rev 0x01 and package 0x00
[    0.190039] ssb: Core 0 found: ChipCommon (cc 0x800, rev 0x11, vendor 0x4243)
[    0.190044] ssb: Core 1 found: IEEE 802.11 (cc 0x812, rev 0x0A,
vendor 0x4243)
[    0.190049] ssb: Core 2 found: USB 1.1 Host (cc 0x817, rev 0x03,
vendor 0x4243)
[    0.190054] ssb: Core 3 found: PCI-E (cc 0x820, rev 0x01, vendor 0x4243)
[    0.330087] ssb: Sonics Silicon Backplane found on PCI device 0000:03:00.0
[    5.810937] b43-phy0: Broadcom 4311 WLAN found (core revision 10)
[    5.910007] b43-phy0: Found PHY: Analog 4, Type 2 (G), Revision 8

This e-mail is a last resort as I was not able to find this issue
mentioned in the last 3 days on the mailing list archives from marc.

          Ronald
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