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mac80211: choose first enabled channel for monitor

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[ Upstream commit 041c881a0ba8a75f71118bd9766b78f04beed469 ]

Even if the first channel from sband channel list is invalid
or disabled mac80211 ends up choosing it as the default channel
for monitor interfaces, making them not usable.

Fix this by assigning the first available valid or enabled
channel instead.

Signed-off-by: Karthikeyan Kathirvel <kathirve@codeaurora.org>
Link: https://lore.kernel.org/r/1615440547-7661-1-git-send-email-kathirve@codeaurora.org
[reword commit message, comment, code cleanups]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Karthikeyan Kathirvel 2021-03-11 10:59:07 +05:30 committed by Greg Kroah-Hartman
parent 7705c48b86
commit 0a66bd60b1
1 changed files with 12 additions and 1 deletions
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13
net/mac80211/main.c
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@ -982,8 +982,19 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
continue;
if (!dflt_chandef.chan) {
/*
* Assign the first enabled channel to dflt_chandef
* from the list of channels
*/
for (i = 0; i < sband->n_channels; i++)
if (!(sband->channels[i].flags &
IEEE80211_CHAN_DISABLED))
break;
/* if none found then use the first anyway */
if (i == sband->n_channels)
i = 0;
cfg80211_chandef_create(&dflt_chandef,
&sband->channels[0],
&sband->channels[i],
NL80211_CHAN_NO_HT);
/* init channel we're on */
if (!local->use_chanctx && !local->_oper_chandef.chan) {