[PATCH] mt76: mt7615: fix possible deadlock while mt7615_register_ext_phy()
From: Peter Chiu <hidden>
Date: 2021-11-01 02:01:48
Also in:
linux-mediatek
Subsystem:
mediatek mt76 wireless lan driver, the rest · Maintainers:
Felix Fietkau, Lorenzo Bianconi, Ryder Lee, Linus Torvalds
ieee80211_register_hw() is called with rtnl_lock held, and this could be caused lockdep from a work item that's on a workqueue that is flushed with the rtnl held. Move mt7615_register_ext_phy() outside the init_work(). Signed-off-by: Peter Chiu <redacted> --- drivers/net/wireless/mediatek/mt76/mt7615/pci_init.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/pci_init.c b/drivers/net/wireless/mediatek/mt76/mt7615/pci_init.c
index a2465b49..87b4aa52 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/pci_init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/pci_init.c@@ -28,8 +28,6 @@ static void mt7615_pci_init_work(struct work_struct *work) return; mt7615_init_work(dev); - if (dev->dbdc_support) - mt7615_register_ext_phy(dev); } static int mt7615_init_hardware(struct mt7615_dev *dev)
@@ -160,6 +158,12 @@ int mt7615_register_device(struct mt7615_dev *dev) mt7615_init_txpower(dev, &dev->mphy.sband_2g.sband); mt7615_init_txpower(dev, &dev->mphy.sband_5g.sband); + if (dev->dbdc_support) { + ret = mt7615_register_ext_phy(dev); + if (ret) + return ret; + } + return mt7615_init_debugfs(dev); }
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2.29.2