linux-kernel - [PATCH v2] coresight: Fixes device's owner field for registered using coresight_init

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Message-ID: <20250317124106.271374-1-hejunhao3@huawei.com>
Date: Mon, 17 Mar 2025 20:41:06 +0800
From: Junhao He <hejunhao3@...wei.com>
To: <suzuki.poulose@....com>, <james.clark@....com>,
	<anshuman.khandual@....com>
CC: <coresight@...ts.linaro.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>
Subject: [PATCH v2] coresight: Fixes device's owner field for registered using coresight_init_driver()

The coresight_init_driver() of the coresight-core module is called from
the sub coresgiht device (such as tmc/stm/funnle/...) module. It calls
amba_driver_register() and Platform_driver_register(), which are macro
functions that use the coresight-core's module to initialize the caller's
owner field.  Therefore, when the sub coresight device calls
coresight_init_driver(), an incorrect THIS_MODULE value is captured.

The sub coesgiht modules can be removed while their callbacks are
running, resulting in a general protection failure.

User a macro to automatically add the THIS_MODULE param to
coresight_init_driver() to fix this.

Fixes: 075b7cd7ad7d ("coresight: Add helpers registering/removing both AMBA and platform drivers")
Signed-off-by: Junhao He <hejunhao3@...wei.com>
---
Changes in v2:
- even a macro to automatically add the THIS_MODULE param for coresight_init_driver();
- Link to v1: https://lore.kernel.org/lkml/c3744062-f7c1-82df-2fa1-591da3b2dc5e@huawei.com/T/
---
 drivers/hwtracing/coresight/coresight-core.c | 11 ++++++-----
 include/linux/coresight.h                    |  7 +++++--
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index 0a9380350fb5..abf2e4fd4de0 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -1486,18 +1486,19 @@ static void __exit coresight_exit(void)
 module_init(coresight_init);
 module_exit(coresight_exit);
 
-int coresight_init_driver(const char *drv, struct amba_driver *amba_drv,
-			  struct platform_driver *pdev_drv)
+int coresight_init_driver_owner(const char *drv, struct amba_driver *amba_drv,
+				struct platform_driver *pdev_drv,
+				struct module *owner)
 {
 	int ret;
 
-	ret = amba_driver_register(amba_drv);
+	ret = __amba_driver_register(amba_drv, owner);
 	if (ret) {
 		pr_err("%s: error registering AMBA driver\n", drv);
 		return ret;
 	}
 
-	ret = platform_driver_register(pdev_drv);
+	ret = __platform_driver_register(pdev_drv, owner);
 	if (!ret)
 		return 0;
 
@@ -1505,7 +1506,7 @@ int coresight_init_driver(const char *drv, struct amba_driver *amba_drv,
 	amba_driver_unregister(amba_drv);
 	return ret;
 }
-EXPORT_SYMBOL_GPL(coresight_init_driver);
+EXPORT_SYMBOL_GPL(coresight_init_driver_owner);
 
 void coresight_remove_driver(struct amba_driver *amba_drv,
 			     struct platform_driver *pdev_drv)
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 17276965ff1d..b07455956f7a 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -689,8 +689,11 @@ coresight_find_output_type(struct coresight_platform_data *pdata,
 			   enum coresight_dev_type type,
 			   union coresight_dev_subtype subtype);
 
-int coresight_init_driver(const char *drv, struct amba_driver *amba_drv,
-			  struct platform_driver *pdev_drv);
+int coresight_init_driver_owner(const char *drv, struct amba_driver *amba_drv,
+				struct platform_driver *pdev_drv, struct module *owner);
+
+#define coresight_init_driver(name, amba_drv, pdev_drv)	\
+	coresight_init_driver_owner(name, amba_drv, pdev_drv, THIS_MODULE)
 
 void coresight_remove_driver(struct amba_driver *amba_drv,
 			     struct platform_driver *pdev_drv);
-- 
2.33.0