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mac80211: choose first enabled channel for monitor

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[ Upstream commit 041c881a0b ]

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 Chris
parent ecc595407b
commit 787cec9a87
1 changed files with 12 additions and 1 deletions
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13
net/mac80211/main.c
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@@ -906,8 +906,19 @@ 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) {