linux-kernel - [PATCH v2] scsi: Make scsi_bus

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Message-Id: <20240212-bus_cleanup-scsi2-v2-1-65004493ff09@marliere.net>
Date: Mon, 12 Feb 2024 15:38:37 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: "James E.J. Bottomley" <jejb@...ux.ibm.com>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH v2] scsi: Make scsi_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 scsi_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>
---
Changes in v2:
- Improved changelog to remove the word "Now".
- Removed unrelated whitespace cleanup.
- Link to v1: https://lore.kernel.org/r/20240211-bus_cleanup-scsi2-v1-1-dd04ee82e6b0@marliere.net
---
 drivers/scsi/scsi_priv.h  | 2 +-
 drivers/scsi/scsi_sysfs.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index 1fbfe1b52c9f..9fc397a9ce7a 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -156,7 +156,7 @@ extern void scsi_sysfs_device_initialize(struct scsi_device *);
 extern struct scsi_transport_template blank_transport_template;
 extern void __scsi_remove_device(struct scsi_device *);

-extern struct bus_type scsi_bus_type;
+extern const struct bus_type scsi_bus_type;
 extern const struct attribute_group *scsi_shost_groups[];

 /* scsi_netlink.c */
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 24f6eefb6803..14d0be0da0c6 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -549,7 +549,7 @@ static int scsi_bus_uevent(const struct device *dev, struct kobj_uevent_env *env
 	return 0;
 }

-struct bus_type scsi_bus_type = {
+const struct bus_type scsi_bus_type = {
         .name		= "scsi",
         .match		= scsi_bus_match,
 	.uevent		= scsi_bus_uevent,

---
base-commit: 59828c7b5975f442ad5bb74a031fe388341f323e
change-id: 20240211-bus_cleanup-scsi2-16c3cfba91af

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