[PATCH 5.18 0445/1095] mt76: mt7921s: fix possible sdio deadlock in command fail

Greg Kroah-Hartman
2022-08-15T21:14:21Z

From: Deren Wu <deren.wu@mediatek.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@mediatek.com>
Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.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