[PATCH 5/8] thunderbolt: Hide switch attributes that are not set

[Timo Aaltonen]

From: Mika Westerberg <mika.westerberg at linux.intel.com>

BugLink: http://bugs.launchpad.net/bugs/1844680

Thunderbolt host routers may not always contain DROM that includes
device identification information. This is mostly needed for Ice Lake
systems but some Falcon Ridge controllers on PCs also do not have DROM.

In that case hide the identification attributes.

Signed-off-by: Mika Westerberg <mika.westerberg at linux.intel.com>
Reviewed-by: Yehezkel Bernat <YehezkelShB at gmail.com>
Tested-by: Mario Limonciello <mario.limonciello at dell.com>
(cherry picked from commit 58f414fa435cf728a82f435bac4781da86afb623)
Signed-off-by: Timo Aaltonen <timo.aaltonen at canonical.com>
---
 drivers/thunderbolt/switch.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 64f845fe4690..bd3eaaf34ea1 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -1337,7 +1337,19 @@ static umode_t switch_attr_is_visible(struct kobject *kobj,
 	struct device *dev = container_of(kobj, struct device, kobj);
 	struct tb_switch *sw = tb_to_switch(dev);
 
-	if (attr == &dev_attr_key.attr) {
+	if (attr == &dev_attr_device.attr) {
+		if (!sw->device)
+			return 0;
+	} else if (attr == &dev_attr_device_name.attr) {
+		if (!sw->device_name)
+			return 0;
+	} else if (attr == &dev_attr_vendor.attr)  {
+		if (!sw->vendor)
+			return 0;
+	} else if (attr == &dev_attr_vendor_name.attr)  {
+		if (!sw->vendor_name)
+			return 0;
+	} else if (attr == &dev_attr_key.attr) {
 		if (tb_route(sw) &&
 		    sw->tb->security_level == TB_SECURITY_SECURE &&
 		    sw->security_level == TB_SECURITY_SECURE)
-- 
2.20.1