linux-kernel - [PATCH] wifi: mt76: mt7996: fix mt7996_mcu_all_sta_info

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Date:   Fri, 10 Nov 2023 15:29:30 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Felix Fietkau <nbd@....name>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Kalle Valo <kvalo@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Yi-Chia Hsieh <yi-chia.hsieh@...iatek.com>,
        Peter Chiu <chui-hao.chiu@...iatek.com>,
        Money Wang <Money.Wang@...iatek.com>,
        Evelyn Tsai <evelyn.tsai@...iatek.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Shayne Chen <shayne.chen@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Bo Jiao <bo.jiao@...iatek.com>,
        MeiChia Chiu <meichia.chiu@...iatek.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH] wifi: mt76: mt7996: fix mt7996_mcu_all_sta_info_event struct packing

From: Arnd Bergmann <arnd@...db.de>

The internal struct and union inside mt7996_mcu_all_sta_info_event is
marked as being aligned, which conflicts with it being unaligned
within that structure:

drivers/net/wireless/mediatek/mt76/mt7996/mcu.h:165:2: error: field  within 'struct mt7996_mcu_all_sta_info_event' is less aligned than 'union mt7996_mcu_all_sta_info_event::(anonymous at ../drivers/net/wireless/mediatek/mt76/mt7996/mcu.h:165:2)' and is usually due to 'struct mt7996_mcu_all_sta_info_event' being packed, which can lead to unaligned accesses [-Werror,-Wunaligned-access]

Mark all three as being packed as well to ensure byte packing for
the entire thing.

Fixes: adde3eed4a75 ("wifi: mt76: mt7996: Add mcu commands for getting sta tx statistic")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/wireless/mediatek/mt76/mt7996/mcu.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.h b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.h
index a88f6af323da..e20c38f17827 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.h
@@ -168,15 +168,15 @@ struct mt7996_mcu_all_sta_info_event {
 			u8 rsv[2];
 			__le32 tx_bytes[IEEE80211_NUM_ACS];
 			__le32 rx_bytes[IEEE80211_NUM_ACS];
-		} adm_stat[0];
+		} adm_stat[0] __packed;
 
 		struct {
 			__le16 wlan_idx;
 			u8 rsv[2];
 			__le32 tx_msdu_cnt;
 			__le32 rx_msdu_cnt;
-		} msdu_cnt[0];
-	};
+		} msdu_cnt[0] __packed;
+	} __packed;
 } __packed;
 
 enum mt7996_chan_mib_offs {
-- 
2.39.2