Now that the driver core can properly handle constant struct bus_type,
move the iucv_bus variable to be a constant structure as well, placing
it into read-only memory which can not be modified at runtime.

Cc: Alexandra Winter <wintera@linux.ibm.com>
Cc: Wenjia Zhang <wenjia@linux.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: linux-s390@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 include/net/iucv/iucv.h | 4 ++--
 net/iucv/iucv.c         | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/net/iucv/iucv.h b/include/net/iucv/iucv.h
index f9e88401d7da..8b2055d64a6b 100644
--- a/include/net/iucv/iucv.h
+++ b/include/net/iucv/iucv.h
@@ -80,7 +80,7 @@ struct iucv_array {
 	u32 length;
 } __attribute__ ((aligned (8)));
 
-extern struct bus_type iucv_bus;
+extern const struct bus_type iucv_bus;
 extern struct device *iucv_root;
 
 /*
@@ -489,7 +489,7 @@ struct iucv_interface {
 	int (*path_sever)(struct iucv_path *path, u8 userdata[16]);
 	int (*iucv_register)(struct iucv_handler *handler, int smp);
 	void (*iucv_unregister)(struct iucv_handler *handler, int smp);
-	struct bus_type *bus;
+	const struct bus_type *bus;
 	struct device *root;
 };
 
diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c
index 0ed6e34d6edd..6334f64f04d5 100644
--- a/net/iucv/iucv.c
+++ b/net/iucv/iucv.c
@@ -67,7 +67,7 @@ static int iucv_bus_match(struct device *dev, struct device_driver *drv)
 	return 0;
 }
 
-struct bus_type iucv_bus = {
+const struct bus_type iucv_bus = {
 	.name = "iucv",
 	.match = iucv_bus_match,
 };
-- 
2.43.0

On Tue, 2023-12-19 at 16:07 +0100, Greg Kroah-Hartman wrote:
> Now that the driver core can properly handle constant struct bus_type,
> move the iucv_bus variable to be a constant structure as well, placing
> it into read-only memory which can not be modified at runtime.
> 
> Cc: Alexandra Winter <wintera@linux.ibm.com>
> Cc: Wenjia Zhang <wenjia@linux.ibm.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Eric Dumazet <edumazet@google.com>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: Paolo Abeni <pabeni@redhat.com>
> Cc: linux-s390@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---

Nit: There seems to be a typo in the subject line s/icuv/iucv/

On Tue, Dec 19, 2023 at 04:25:13PM +0100, Niklas Schnelle wrote:
> On Tue, 2023-12-19 at 16:07 +0100, Greg Kroah-Hartman wrote:
> > Now that the driver core can properly handle constant struct bus_type,
> > move the iucv_bus variable to be a constant structure as well, placing
> > it into read-only memory which can not be modified at runtime.
> > 
> > Cc: Alexandra Winter <wintera@linux.ibm.com>
> > Cc: Wenjia Zhang <wenjia@linux.ibm.com>
> > Cc: "David S. Miller" <davem@davemloft.net>
> > Cc: Eric Dumazet <edumazet@google.com>
> > Cc: Jakub Kicinski <kuba@kernel.org>
> > Cc: Paolo Abeni <pabeni@redhat.com>
> > Cc: linux-s390@vger.kernel.org
> > Cc: netdev@vger.kernel.org
> > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > ---
> 
> Nit: There seems to be a typo in the subject line s/icuv/iucv/

Ugh, good catch, let me go send a v2, thanks!

greg k-h

On 19.12.23 16:07, Greg Kroah-Hartman wrote:
> Now that the driver core can properly handle constant struct bus_type,
> move the iucv_bus variable to be a constant structure as well, placing
> it into read-only memory which can not be modified at runtime.
> 
> Cc: Alexandra Winter <wintera@linux.ibm.com>
> Cc: Wenjia Zhang <wenjia@linux.ibm.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Eric Dumazet <edumazet@google.com>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: Paolo Abeni <pabeni@redhat.com>
> Cc: linux-s390@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---

Acked-by: Alexandra Winter <wintera@linux.ibm.com>