[PATCH] thunderbolt: Constify static attribute_group structs

[Rikard Falkeborn]

The only usage of these is to put their addresses in arrays of pointers
to const attribute_groups. Make them const to allow the compiler to put
them in read-only memory.

Signed-off-by: Rikard Falkeborn <rikard.falkeb...@gmail.com>
---
 drivers/thunderbolt/domain.c  | 2 +-
 drivers/thunderbolt/switch.c  | 2 +-
 drivers/thunderbolt/xdomain.c | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c
index f0de94f7acbf..d2b92a8be577 100644
--- a/drivers/thunderbolt/domain.c
+++ b/drivers/thunderbolt/domain.c
@@ -289,7 +289,7 @@ static umode_t domain_attr_is_visible(struct kobject *kobj,
        return attr->mode;
 }
 
-static struct attribute_group domain_attr_group = {
+static const struct attribute_group domain_attr_group = {
        .is_visible = domain_attr_is_visible,
        .attrs = domain_attrs,
 };
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index a8572f49d3ad..602e1835bf61 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -1771,7 +1771,7 @@ static umode_t switch_attr_is_visible(struct kobject 
*kobj,
        return sw->safe_mode ? 0 : attr->mode;
 }
 
-static struct attribute_group switch_group = {
+static const struct attribute_group switch_group = {
        .is_visible = switch_attr_is_visible,
        .attrs = switch_attrs,
 };
diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c
index 9b3a299a1202..f2d4db1cd84d 100644
--- a/drivers/thunderbolt/xdomain.c
+++ b/drivers/thunderbolt/xdomain.c
@@ -756,7 +756,7 @@ static struct attribute *tb_service_attrs[] = {
        NULL,
 };
 
-static struct attribute_group tb_service_attr_group = {
+static const struct attribute_group tb_service_attr_group = {
        .attrs = tb_service_attrs,
 };
 
@@ -1239,7 +1239,7 @@ static struct attribute *xdomain_attrs[] = {
        NULL,
 };
 
-static struct attribute_group xdomain_attr_group = {
+static const struct attribute_group xdomain_attr_group = {
        .attrs = xdomain_attrs,
 };
 
-- 
2.30.0