From 569008744178b672ea3ad9047fa3098f1b73ca55 Mon Sep 17 00:00:00 2001
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Wed, 18 Aug 2021 10:20:57 +0200
Subject: [PATCH] mt76: mt7921: always wake device if necessary in debugfs
Git-commit: 569008744178b672ea3ad9047fa3098f1b73ca55
Patch-mainline: v5.16-rc1
References: git-fixes stable-5.14.19

Add missing device wakeup in debugfs code if we are accessing chip
registers.

Fixes: 1d8efc741df8 ("mt76: mt7921: introduce Runtime PM support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c b/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c
index 29a24e768617..599e6e53e94f 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c
@@ -95,6 +95,8 @@ mt7921_tx_stats_show(struct seq_file *file, void *data)
 	struct mt7921_dev *dev = file->private;
 	int stat[8], i, n;
 
+	mt7921_mutex_acquire(dev);
+
 	mt7921_ampdu_stat_read_phy(&dev->phy, file);
 
 	/* Tx amsdu info */
@@ -104,6 +106,8 @@ mt7921_tx_stats_show(struct seq_file *file, void *data)
 		n += stat[i];
 	}
 
+	mt7921_mutex_release(dev);
+
 	for (i = 0; i < ARRAY_SIZE(stat); i++) {
 		seq_printf(file, "AMSDU pack count of %d MSDU in TXD: 0x%x ",
 			   i + 1, stat[i]);
@@ -124,6 +128,8 @@ mt7921_queues_acq(struct seq_file *s, void *data)
 	struct mt7921_dev *dev = dev_get_drvdata(s->private);
 	int i;
 
+	mt7921_mutex_acquire(dev);
+
 	for (i = 0; i < 16; i++) {
 		int j, acs = i / 4, index = i % 4;
 		u32 ctrl, val, qlen = 0;
@@ -143,6 +149,8 @@ mt7921_queues_acq(struct seq_file *s, void *data)
 		seq_printf(s, "AC%d%d: queued=%d\n", acs, index, qlen);
 	}
 
+	mt7921_mutex_release(dev);
+
 	return 0;
 }
 
-- 
2.26.2