linux-kernel - [PATCH 3.16 085/133] mac80211

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Message-ID: <lsq.1511315893.682034171@decadent.org.uk>
Date:   Wed, 22 Nov 2017 01:58:13 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Beni Lev" <beni.lev@...el.com>,
        "Johannes Berg" <johannes.berg@...el.com>,
        "Luca Coelho" <luciano.coelho@...el.com>
Subject: [PATCH 3.16 085/133] mac80211_hwsim: Use proper TX power

3.16.51-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Beni Lev <beni.lev@...el.com>

commit 9de981f507474f326e42117858dc9a9321331ae5 upstream.

In struct ieee80211_tx_info, control.vif pointer and rate_driver_data[0]
falls on the same place, depending on the union usage.
During the whole TX process, the union is referred to as a control struct,
which holds the vif that is later used in the tx flow, especially in order
to derive the used tx power.
Referring direcly to rate_driver_data[0] and assigning a value to it,
overwrites the vif pointer, hence making all later references irrelevant.
Moreover, rate_driver_data[0] isn't used later in the flow in order to
retrieve the channel that it is pointing to.

Signed-off-by: Beni Lev <beni.lev@...el.com>
Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/wireless/mac80211_hwsim.c | 2 --
 1 file changed, 2 deletions(-)

--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -1122,7 +1122,6 @@ static void mac80211_hwsim_tx(struct iee
 				       txi->control.rates,
 				       ARRAY_SIZE(txi->control.rates));

-	txi->rate_driver_data[0] = channel;
 	mac80211_hwsim_monitor_rx(hw, skb, channel);

 	/* wmediumd mode check */