[Bug 202502] [net80211] [patch]: check and reset (if necessary) currently selected channel before device initialization

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202502

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: adrian
Date: Sun Aug 23 01:17:53 UTC 2015
New revision: 287029
URL: https://svnweb.freebsd.org/changeset/base/287029

Log:
  Reset the channel to the first available channel if the interface
  is configured on a channel that isn't valid in the new operating mode.

  This isn't strictly true - it should find the first channel that is
  available for the given operating mode.

  However, I think defaulting to the first channel is fine - it's typically
  available for all modes.

  If someone would like to correctly implement this feature - try to
  find a channel that is valid for the given operating mode and error
  out if we can't find one.

  This prevents various NICs (eg wpi(4)) from throwing a firmware error.

  Tested:

  * ath(4), STA/AP mode
  * iwn(4), STA/adhoc mode

  PR:        kern/202502
  Submitted by:    Andriy Voskoboinyk <s3erios at gmail.com>

Changes:
  head/sys/net80211/ieee80211_proto.c

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