From 6f53e73b9ec5b3cd097077c5ffcb76df708ce3f8 Mon Sep 17 00:00:00 2001 From: Sagi Grimberg Date: Mon, 29 Apr 2019 16:28:19 -0700 Subject: [PATCH] nvmet: protect discovery change log event list iteration When we iterate on the discovery subsystem controllers we need to protect against concurrent mutations to it. Signed-off-by: Sagi Grimberg Reviewed-by: Minwoo Im Signed-off-by: Christoph Hellwig --- drivers/nvme/target/discovery.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/nvme/target/discovery.c b/drivers/nvme/target/discovery.c index e8e09266bfa5..5baf269f3f8a 100644 --- a/drivers/nvme/target/discovery.c +++ b/drivers/nvme/target/discovery.c @@ -30,14 +30,17 @@ void nvmet_port_disc_changed(struct nvmet_port *port, { struct nvmet_ctrl *ctrl; + lockdep_assert_held(&nvmet_config_sem); nvmet_genctr++; + mutex_lock(&nvmet_disc_subsys->lock); list_for_each_entry(ctrl, &nvmet_disc_subsys->ctrls, subsys_entry) { if (subsys && !nvmet_host_allowed(subsys, ctrl->hostnqn)) continue; __nvmet_disc_changed(port, ctrl); } + mutex_unlock(&nvmet_disc_subsys->lock); } static void __nvmet_subsys_disc_changed(struct nvmet_port *port, @@ -46,12 +49,14 @@ static void __nvmet_subsys_disc_changed(struct nvmet_port *port, { struct nvmet_ctrl *ctrl; + mutex_lock(&nvmet_disc_subsys->lock); list_for_each_entry(ctrl, &nvmet_disc_subsys->ctrls, subsys_entry) { if (host && strcmp(nvmet_host_name(host), ctrl->hostnqn)) continue; __nvmet_disc_changed(port, ctrl); } + mutex_unlock(&nvmet_disc_subsys->lock); } void nvmet_subsys_disc_changed(struct nvmet_subsys *subsys, -- 2.30.2