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thunderbolt: Increase runtime PM reference count on DP tunnel discovery

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commit c94732bda0 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mika Westerberg
2020-12-10 14:57:10 +02:00
committed by Greg Kroah-Hartman
parent f4ca082e3f
commit 6c3c90058b
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->boot = true;
parent = tb_switch_parent(parent); 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); list_add_tail(&tunnel->list, &tcm->tunnel_list);