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authorMika Westerberg <mika.westerberg@linux.intel.com>2017-10-11 17:19:54 +0300
committerMika Westerberg <mika.westerberg@linux.intel.com>2019-04-18 11:18:53 +0300
commit344e06430a72347b554a7fd98f3a961084f37be6 (patch)
tree749030b9462451e58673e0ceb987be245d26c978 /drivers/thunderbolt
parent99cabbb006f1eb509e8bbc88c020c806017ed582 (diff)
downloadlinux-344e06430a72347b554a7fd98f3a961084f37be6.tar.xz
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>
Diffstat (limited to 'drivers/thunderbolt')
-rw-r--r--drivers/thunderbolt/tb.c10
-rw-r--r--drivers/thunderbolt/tb.h5
2 files changed, 11 insertions, 4 deletions
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index cfc451c938fd..fb01396a62a9 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -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:
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 5b5ba8919086..260360ec59a9 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -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;