[PATCH] gpu: host1x: Make host1x_context_device_bus_type constant

[PATCH] gpu: host1x: Make host1x_context_device_bus_type constant

[Kunwu Chan]

From: Kunwu Chan <chentao@kylinos.cn>

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_context_device_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@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
---
 drivers/gpu/host1x/context_bus.c   | 2 +-
 include/linux/host1x_context_bus.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/host1x/context_bus.c b/drivers/gpu/host1x/context_bus.c
index d9421179d7b4..7cd0e1a5edd1 100644
--- a/drivers/gpu/host1x/context_bus.c
+++ b/drivers/gpu/host1x/context_bus.c
@@ -6,7 +6,7 @@
 #include <linux/device.h>
 #include <linux/of.h>
 
-struct bus_type host1x_context_device_bus_type = {
+const struct bus_type host1x_context_device_bus_type = {
 	.name = "host1x-context",
 };
 EXPORT_SYMBOL_GPL(host1x_context_device_bus_type);
diff --git a/include/linux/host1x_context_bus.h b/include/linux/host1x_context_bus.h
index 72462737a6db..c928cb432680 100644
--- a/include/linux/host1x_context_bus.h
+++ b/include/linux/host1x_context_bus.h
@@ -9,7 +9,7 @@
 #include <linux/device.h>
 
 #ifdef CONFIG_TEGRA_HOST1X_CONTEXT_BUS
-extern struct bus_type host1x_context_device_bus_type;
+extern const struct bus_type host1x_context_device_bus_type;
 #endif
 
 #endif
-- 
2.41.0

Re: [PATCH] gpu: host1x: Make host1x_context_device_bus_type constant

[Thierry Reding]

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On Fri, Aug 23, 2024 at 04:07:24PM GMT, Kunwu Chan wrote:
> From: Kunwu Chan <chentao@kylinos.cn>
> 
> 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_context_device_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@linuxfoundation.org>
> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
> ---
>  drivers/gpu/host1x/context_bus.c   | 2 +-
>  include/linux/host1x_context_bus.h | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)

Applied, thanks.

Thierry

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