linux-kernel - [PATCH 5.13 505/800] mt76: mt7921: wake the device before dumping power table

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Message-Id: <20210712061020.915811449@linuxfoundation.org>
Date:   Mon, 12 Jul 2021 08:08:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lorenzo Bianconi <lorenzo@...nel.org>,
        Felix Fietkau <nbd@....name>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 505/800] mt76: mt7921: wake the device before dumping power table

From: Lorenzo Bianconi <lorenzo@...nel.org>

[ Upstream commit 271fa685365842962f56651c9d1a33a0d0d3b30b ]

Always wake the device up before dumping the single_sku power table
otherwise the device can hang.

Fixes: ea29acc97c555 ("mt76: mt7921: add dumping Tx power table")
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c b/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c
index 6ee423dd4027..6602903c0d02 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c
@@ -184,7 +184,10 @@ mt7921_txpwr(struct seq_file *s, void *data)
 	struct mt7921_txpwr txpwr;
 	int ret;
 
+	mt7921_mutex_acquire(dev);
 	ret = mt7921_get_txpwr_info(dev, &txpwr);
+	mt7921_mutex_release(dev);
+
 	if (ret)
 		return ret;
 
-- 
2.30.2