linux-kernel - [PATCH] gpu: host1x: bus: make host1x_bus

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Message-Id: <20240213-bus_cleanup-host1x-v1-1-54ec51b5d14f@marliere.net>
Date: Tue, 13 Feb 2024 11:44:40 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Thierry Reding <thierry.reding@...il.com>, 
 Mikko Perttunen <mperttunen@...dia.com>, David Airlie <airlied@...il.com>, 
 Daniel Vetter <daniel@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] gpu: host1x: bus: make host1x_bus_type const

Since commit d492cc2573a0 ("driver core: device.h: make struct
bus_type a const *"), the driver core can properly handle constant
struct bus_type, move the host1x_bus_type variable to be a constant
structure as well, placing it into read-only memory which can not be
modified at runtime.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
---
 drivers/gpu/host1x/bus.c | 2 +-
 drivers/gpu/host1x/bus.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/host1x/bus.c b/drivers/gpu/host1x/bus.c
index 4d16a3396c4a..a20dad7f0333 100644
--- a/drivers/gpu/host1x/bus.c
+++ b/drivers/gpu/host1x/bus.c
@@ -382,7 +382,7 @@ static const struct dev_pm_ops host1x_device_pm_ops = {
 	.restore = pm_generic_restore,
 };

-struct bus_type host1x_bus_type = {
+const struct bus_type host1x_bus_type = {
 	.name = "host1x",
 	.match = host1x_device_match,
 	.uevent = host1x_device_uevent,
diff --git a/drivers/gpu/host1x/bus.h b/drivers/gpu/host1x/bus.h
index a4adf9abc3b4..a80ceadfeb34 100644
--- a/drivers/gpu/host1x/bus.h
+++ b/drivers/gpu/host1x/bus.h
@@ -10,7 +10,7 @@
 struct bus_type;
 struct host1x;

-extern struct bus_type host1x_bus_type;
+extern const struct bus_type host1x_bus_type;

 int host1x_register(struct host1x *host1x);
 int host1x_unregister(struct host1x *host1x);

---
base-commit: 2429b3c529da29d4277d519bd66d034842dcd70c
change-id: 20240213-bus_cleanup-host1x-09f7f06652b9

Best regards,
-- 
Ricardo B. Marliere <ricardo@...liere.net>