device_cgroup: Fix RCU list debugging warning
[ Upstream commit bc62d68e2a
]
exceptions may be traversed using list_for_each_entry_rcu()
outside of an RCU read side critical section BUT under the
protection of decgroup_mutex. Hence add the corresponding
lockdep expression to fix the following false-positive
warning:
[ 2.304417] =============================
[ 2.304418] WARNING: suspicious RCU usage
[ 2.304420] 5.5.4-stable #17 Tainted: G E
[ 2.304422] -----------------------------
[ 2.304424] security/device_cgroup.c:355 RCU-list traversed in non-reader section!!
Signed-off-by: Amol Grover <frextrite@gmail.com>
Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -352,7 +352,8 @@ static bool match_exception_partial(struct list_head *exceptions, short type,
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{
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struct dev_exception_item *ex;
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list_for_each_entry_rcu(ex, exceptions, list) {
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list_for_each_entry_rcu(ex, exceptions, list,
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lockdep_is_held(&devcgroup_mutex)) {
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if ((type & DEVCG_DEV_BLOCK) && !(ex->type & DEVCG_DEV_BLOCK))
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continue;
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if ((type & DEVCG_DEV_CHAR) && !(ex->type & DEVCG_DEV_CHAR))
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