[PATCH] bus: fsl-mc: make fsl_mc_bus_type const

[PATCH] bus: fsl-mc: make fsl_mc_bus_type const

[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 fsl_mc_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/bus/fsl-mc/fsl-mc-bus.c | 2 +-
 include/linux/fsl/mc.h          | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index dd68b8191a0a..930d8a3ba722 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -309,7 +309,7 @@ static struct attribute *fsl_mc_bus_attrs[] = {
 
 ATTRIBUTE_GROUPS(fsl_mc_bus);
 
-struct bus_type fsl_mc_bus_type = {
+const struct bus_type fsl_mc_bus_type = {
 	.name = "fsl-mc",
 	.match = fsl_mc_bus_match,
 	.uevent = fsl_mc_bus_uevent,
diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
index 083c860fd28e..c90ec889bfc2 100644
--- a/include/linux/fsl/mc.h
+++ b/include/linux/fsl/mc.h
@@ -436,7 +436,7 @@ void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev);
 struct fsl_mc_device *fsl_mc_get_endpoint(struct fsl_mc_device *mc_dev,
 					  u16 if_id);
 
-extern struct bus_type fsl_mc_bus_type;
+extern const struct bus_type fsl_mc_bus_type;
 
 extern struct device_type fsl_mc_bus_dprc_type;
 extern struct device_type fsl_mc_bus_dpni_type;
-- 
2.43.0

Re: [PATCH] bus: fsl-mc: make fsl_mc_bus_type const

[Christophe Leroy]

Le 23/08/2024 à 08:24, Kunwu Chan a écrit :
> [Vous ne recevez pas souvent de courriers de kunwu.chan@linux.dev. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
> 
> 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 fsl_mc_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>

Acked-by: Christophe Leroy <christophe.leroy@csgroup.eu> # for 
include/linux/fsl/mc.h

> ---
>   drivers/bus/fsl-mc/fsl-mc-bus.c | 2 +-
>   include/linux/fsl/mc.h          | 2 +-
>   2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
> index dd68b8191a0a..930d8a3ba722 100644
> --- a/drivers/bus/fsl-mc/fsl-mc-bus.c
> +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
> @@ -309,7 +309,7 @@ static struct attribute *fsl_mc_bus_attrs[] = {
> 
>   ATTRIBUTE_GROUPS(fsl_mc_bus);
> 
> -struct bus_type fsl_mc_bus_type = {
> +const struct bus_type fsl_mc_bus_type = {
>          .name = "fsl-mc",
>          .match = fsl_mc_bus_match,
>          .uevent = fsl_mc_bus_uevent,
> diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
> index 083c860fd28e..c90ec889bfc2 100644
> --- a/include/linux/fsl/mc.h
> +++ b/include/linux/fsl/mc.h
> @@ -436,7 +436,7 @@ void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev);
>   struct fsl_mc_device *fsl_mc_get_endpoint(struct fsl_mc_device *mc_dev,
>                                            u16 if_id);
> 
> -extern struct bus_type fsl_mc_bus_type;
> +extern const struct bus_type fsl_mc_bus_type;
> 
>   extern struct device_type fsl_mc_bus_dprc_type;
>   extern struct device_type fsl_mc_bus_dpni_type;
> --
> 2.43.0
>