linux-kernel - [PATCH 1/6] scsi: store owner from modules with scsi_register

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Message-Id: <20240328-b4-module-owner-scsi-v1-1-c86cb4f6e91c@linaro.org>
Date: Thu, 28 Mar 2024 21:45:45 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: "James E.J. Bottomley" <jejb@...ux.ibm.com>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>, 
 Kai Mäkisara <Kai.Makisara@...umbus.fi>, 
 Alim Akhtar <alim.akhtar@...sung.com>, Avri Altman <avri.altman@....com>, 
 Bart Van Assche <bvanassche@....org>
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 1/6] scsi: store owner from modules with
 scsi_register_driver()

Modules registering driver with scsi_driver_register() might forget to
set .owner field.  The field is used by some of other kernel parts for
reference counting (try_module_get()), so it is expected that drivers
will set it.

Solve the problem by moving this task away from the drivers to the core
scsi code, just like we did for platform_driver in
commit 9447057eaff8 ("platform_device: use a macro instead of
platform_driver_register").

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/scsi/scsi_sysfs.c  | 5 +++--
 include/scsi/scsi_driver.h | 4 +++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 775df00021e4..b5aae4e8ae33 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -1609,13 +1609,14 @@ void scsi_remove_target(struct device *dev)
 }
 EXPORT_SYMBOL(scsi_remove_target);

-int scsi_register_driver(struct device_driver *drv)
+int __scsi_register_driver(struct device_driver *drv, struct module *owner)
 {
 	drv->bus = &scsi_bus_type;
+	drv->owner = owner;

 	return driver_register(drv);
 }
-EXPORT_SYMBOL(scsi_register_driver);
+EXPORT_SYMBOL(__scsi_register_driver);

 int scsi_register_interface(struct class_interface *intf)
 {
diff --git a/include/scsi/scsi_driver.h b/include/scsi/scsi_driver.h
index 4ce1988b2ba0..5c6724322112 100644
--- a/include/scsi/scsi_driver.h
+++ b/include/scsi/scsi_driver.h
@@ -22,7 +22,9 @@ struct scsi_driver {
 #define to_scsi_driver(drv) \
 	container_of((drv), struct scsi_driver, gendrv)

-extern int scsi_register_driver(struct device_driver *);
+#define scsi_register_driver(drv) \
+	__scsi_register_driver(drv, THIS_MODULE)
+int __scsi_register_driver(struct device_driver *, struct module *);
 #define scsi_unregister_driver(drv) \
 	driver_unregister(drv);

-- 
2.34.1