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authorPaul E. McKenney <paulmck@kernel.org>2019-11-27 05:05:45 +0300
committerPaul E. McKenney <paulmck@kernel.org>2020-01-24 21:27:33 +0300
commit5b14557b073c96a7cf79adc4d7b6c4a8c26b2a43 (patch)
tree4c4590af8b9c59b6408350d387c5aed3c4e76204 /drivers/net/wireless/mediatek/mt76/mt76x0/eeprom.c
parent77339e61aa309310a535bd01eb3388f7a27b36f9 (diff)
downloadlinux-5b14557b073c96a7cf79adc4d7b6c4a8c26b2a43.tar.xz
rcu: Avoid tick_dep_set_cpu() misordering
In the current code, rcu_nmi_enter_common() might decide to turn on the tick using tick_dep_set_cpu(), but be delayed just before doing so. Then the grace-period kthread might notice that the CPU in question had in fact gone through a quiescent state, thus turning off the tick using tick_dep_clear_cpu(). The later invocation of tick_dep_set_cpu() would then incorrectly leave the tick on. This commit therefore enlists the aid of the leaf rcu_node structure's ->lock to ensure that decisions to enable or disable the tick are carried out before they can be reversed. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'drivers/net/wireless/mediatek/mt76/mt76x0/eeprom.c')
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