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nvmet: Pass lockdep expression to RCU lists 

[ Upstream commit 4ac76436a6 ]

ctrl->subsys->namespaces and subsys->namespaces are traversed with
list_for_each_entry_rcu outside an RCU read-side critical section but
under the protection of ctrl->subsys->lock and subsys->lock respectively.

Hence, add the corresponding lockdep expression to the list traversal
primitive to silence false-positive lockdep warnings, and harden RCU
lists.

Reported-by: kbuild test robot <lkp@intel.com>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Amol Grover <frextrite@gmail.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Amol Grover 2020-01-11 13:08:16 +05:30 committed by Greg Kroah-Hartman
parent d5461fdd96
commit 1d0fbf3e26
1 changed files with 4 additions and 2 deletions
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6
drivers/nvme/target/core.c
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@ -555,7 +555,8 @@ int nvmet_ns_enable(struct nvmet_ns *ns)
} else {
struct nvmet_ns *old;
list_for_each_entry_rcu(old, &subsys->namespaces, dev_link) {
list_for_each_entry_rcu(old, &subsys->namespaces, dev_link,
lockdep_is_held(&subsys->lock)) {
BUG_ON(ns->nsid == old->nsid);
if (ns->nsid < old->nsid)
break;
@ -1174,7 +1175,8 @@ static void nvmet_setup_p2p_ns_map(struct nvmet_ctrl *ctrl,
ctrl->p2p_client = get_device(req->p2p_client);
list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link)
list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link,
lockdep_is_held(&ctrl->subsys->lock))
nvmet_p2pmem_ns_add_p2p(ctrl, ns);
}