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thunderbolt: Scan only valid NULL adapter ports in hotplug 

The only way to expand Thunderbolt topology is through the NULL adapter
ports (typically ports 1, 2, 3 and 4). There is no point handling
Thunderbolt hotplug events on any other port.

Add a helper function (tb_port_is_null()) that can be used to determine
if the port is NULL port, and use it in software connection manager code
when hotplug event is handled.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg 2017-10-11 17:19:54 +03:00
parent 99cabbb006
commit 344e06430a
2 changed files with 11 additions and 4 deletions
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10
drivers/thunderbolt/tb.c
View File

@ -356,10 +356,12 @@ static void tb_handle_hotplug(struct work_struct *work)
tb_port_info(port,
"got plug event for connected port, ignoring\n");
} else {
tb_port_info(port, "hotplug: scanning\n");
tb_scan_port(port);
if (!port->remote)
tb_port_info(port, "hotplug: no switch found\n");
if (tb_port_is_null(port)) {
tb_port_info(port, "hotplug: scanning\n");
tb_scan_port(port);
if (!port->remote)
tb_port_info(port, "hotplug: no switch found\n");
}
}
put_sw:

5
drivers/thunderbolt/tb.h
View File

@ -350,6 +350,11 @@ static inline bool tb_port_has_remote(const struct tb_port *port)
return true;
}
static inline bool tb_port_is_null(const struct tb_port *port)
{
return port && port->port && port->config.type == TB_TYPE_PORT;
}
static inline bool tb_port_is_pcie_down(const struct tb_port *port)
{
return port && port->config.type == TB_TYPE_PCIE_DOWN;