linux-kernel - [PATCH 5.19 0478/1157] mt76: mt7921s: fix possible sdio deadlock in command fail

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Date:   Mon, 15 Aug 2022 19:57:14 +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, YN Chen <YN.Chen@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Deren Wu <deren.wu@...iatek.com>, Felix Fietkau <nbd@....name>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0478/1157] mt76: mt7921s: fix possible sdio deadlock in command fail

From: Deren Wu <deren.wu@...iatek.com>

[ Upstream commit 364718c94ac2ea4e51958ac0aa15c9092c785a3a ]

Move sdio_release_host() to final resource handing

Fixes: b12deb5e86fa ("mt76: mt7921s: fix mt7921s_mcu_[fw|drv]_pmctrl")
Reported-by: YN Chen <YN.Chen@...iatek.com>
Co-developed-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Deren Wu <deren.wu@...iatek.com>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c
index 54a5c712a3c3..c572a3107b8b 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c
@@ -136,8 +136,8 @@ int mt7921s_mcu_fw_pmctrl(struct mt7921_dev *dev)
 	struct sdio_func *func = dev->mt76.sdio.func;
 	struct mt76_phy *mphy = &dev->mt76.phy;
 	struct mt76_connac_pm *pm = &dev->pm;
-	int err = 0;
 	u32 status;
+	int err;
 
 	sdio_claim_host(func);
 
@@ -148,7 +148,7 @@ int mt7921s_mcu_fw_pmctrl(struct mt7921_dev *dev)
 					 2000, 1000000);
 		if (err < 0) {
 			dev_err(dev->mt76.dev, "mailbox ACK not cleared\n");
-			goto err;
+			goto out;
 		}
 	}
 
@@ -156,18 +156,18 @@ int mt7921s_mcu_fw_pmctrl(struct mt7921_dev *dev)
 
 	err = readx_poll_timeout(mt76s_read_pcr, &dev->mt76, status,
 				 !(status & WHLPCR_IS_DRIVER_OWN), 2000, 1000000);
+out:
 	sdio_release_host(func);
 
-err:
 	if (err < 0) {
 		dev_err(dev->mt76.dev, "firmware own failed\n");
 		clear_bit(MT76_STATE_PM, &mphy->state);
-		err = -EIO;
+		return -EIO;
 	}
 
 	pm->stats.last_doze_event = jiffies;
 	pm->stats.awake_time += pm->stats.last_doze_event -
 				pm->stats.last_wake_event;
 
-	return err;
+	return 0;
 }
-- 
2.35.1