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thunderbolt: Increase runtime PM reference count on DP tunnel discovery

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If the driver is unbound and then bound back it goes over the topology
and figure out the existing tunnels. However, if it finds DP tunnel it
should make sure the domain does not runtime suspend as otherwise it
will tear down the DP tunnel unexpectedly.

Fixes: 6ac6faee5d ("thunderbolt: Add runtime PM for Software CM")
Cc: stable@vger.kernel.org
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg 2020-12-10 14:57:10 +02:00
parent 781e14eaa7
commit c94732bda0
1 changed files with 4 additions and 0 deletions
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4
drivers/thunderbolt/tb.c
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@ -138,6 +138,10 @@ static void tb_discover_tunnels(struct tb_switch *sw)
parent->boot = true;
parent = tb_switch_parent(parent);
}
} else if (tb_tunnel_is_dp(tunnel)) {
/* Keep the domain from powering down */
pm_runtime_get_sync(&tunnel->src_port->sw->dev);
pm_runtime_get_sync(&tunnel->dst_port->sw->dev);
}
list_add_tail(&tunnel->list, &tcm->tunnel_list);