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The nl80211_set_wiphy() function was changed between kernel 5.11 and 5.12 to take the rdev->wiphy lock which should be freed at the end again. The 500-mac80211_configure_antenna_gain.patch added some code which just returned in some cases without unlocking. This resulted in a deadlock with brcmfmac. This patch fixes this by also jumping to the out label in case we want to leave the function. This fixes a hanging system when brcmfmac is in use. I do not know why we do not see this with other driver. The kernel returns very useful debug details when setting these OpenWrt configuration options: CONFIG_KERNEL_DETECT_HUNG_TASK=y CONFIG_KERNEL_PROVE_LOCKING=y Fixes: FS#4122 Fixes: b96c2569ac76 ("mac80211: Update to version 5.12.19-1") Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>