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wifi: mt76: do not run mt76_unregister_device() on unregistered hw

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Trying to probe a mt7921e pci card without firmware results in a
successful probe where ieee80211_register_hw hasn't been called. When
removing the driver, ieee802111_unregister_hw is called unconditionally
leading to a kernel NULL pointer dereference.
Fix the issue running mt76_unregister_device routine just for registered
hw.

Link: https://bugs.debian.org/1029116
Link: https://bugs.kali.org/view.php?id=8140
Reported-by: Stuart Hayhurst <[email protected]>
Fixes: 1c71e03afe4b ("mt76: mt7921: move mt7921_init_hw in a dedicated work")
Tested-by: Helmut Grohne <[email protected]>
Signed-off-by: Lorenzo Bianconi <[email protected]>
This commit is contained in:
Lorenzo Bianconi
2023-03-01 17:39:20 +01:00
committed by Felix Fietkau
parent eff7666e1a
commit 920bc6e1fc
2 changed files with 9 additions and 0 deletions
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mt76.h
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@@ -402,6 +402,7 @@ struct mt76_tx_cb {
enum {
MT76_STATE_INITIALIZED,
MT76_STATE_REGISTERED,
MT76_STATE_RUNNING,
MT76_STATE_MCU_RUNNING,
MT76_SCANNING,