https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206199
Bug ID: 206199
Summary: [patch] dev/bwn suppressing "bwn0: unsupported rate 0"
messages
Product: Base System
Version: 10.2-RELEASE
Hardware: Any
OS: Any
Status: New
Keywords: patch
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: mugius.0x101.free...@gmail.com
Keywords: patch
Created attachment 165497
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=165497&action=edit
The patch file
Background:
-----------
https://forums.freebsd.org/threads/minor-nuisance-issue-bwn0-unsupported-rate-0.41355/
Original code:
--------------
https://svnweb.freebsd.org/base/release/10.2.0/sys/dev/bwn/if_bwn.c?view=markup#l9635
9635 else {
9636 rix = ieee80211_ratectl_rate(ni, NULL, 0);
9637 rate = ni->ni_txrate;
9638
9639 if (rix > 0)
9640 rate_fb = ni->ni_rates.rs_rates[rix - 1] &
9641 IEEE80211_RATE_VAL;
9642 else
9643 rate_fb = rate;
9644 }
Explanation:
------------
The ni->ni_rates.rs_rates container is supposed to house the negotiated rates
in increasing magnitude.
The rix variable contains the size of this container.
The original code is trying to get the last element in the container (supposed
to be the highest rate).
After a few tests though, it turned out that this container has some filler
elements of value "0" at its end. So, the last element in the container is not
necessarily the highest rate.
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