linux-kernel - [PATCH] Print some info into ring-buffer during loading

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Message-Id: <20220619083207.749-1-root@LAPTOP-706CEGJT.localdomain>
Date:   Sun, 19 Jun 2022 16:32:07 +0800
From:   root <lijessen2016@...il.com>
To:     wsa@...nel.org
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        root <root@...TOP-706CEGJT.localdomain>
Subject: [PATCH] Print some info into ring-buffer during loading

---
 drivers/i2c/i2c-core-base.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index d43db2c3876e..8e127ff3e32e 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -469,6 +469,8 @@ static int i2c_device_probe(struct device *dev)
 	struct i2c_driver	*driver;
 	int status;
 
+	pr_info("I have changed i2c device driver\n");
+
 	if (!client)
 		return 0;
 
@@ -1829,6 +1831,7 @@ int i2c_for_each_dev(void *data, int (*fn)(struct device *dev, void *data))
 	int res;
 
 	mutex_lock(&core_lock);
+	pr_info("i2c_for_each_dev: before bus_for_each_dev\n");
 	res = bus_for_each_dev(&i2c_bus_type, NULL, data, fn);
 	mutex_unlock(&core_lock);
 
@@ -1838,8 +1841,10 @@ EXPORT_SYMBOL_GPL(i2c_for_each_dev);
 
 static int __process_new_driver(struct device *dev, void *data)
 {
+	pr_info("Enter process_new_driver\n");
 	if (dev->type != &i2c_adapter_type)
 		return 0;
+	pr_info("__process_new_driver, before i2c_do_add_adapter\n");
 	return i2c_do_add_adapter(data, to_i2c_adapter(dev));
 }
 
@@ -1860,13 +1865,16 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver)
 	driver->driver.owner = owner;
 	driver->driver.bus = &i2c_bus_type;
 	INIT_LIST_HEAD(&driver->clients);
-
+	pr_info("i2c driver name is [%s] before driver_register\n", driver->driver.name);
 	/* When registration returns, the driver core
 	 * will have called probe() for all matching-but-unbound devices.
 	 */
 	res = driver_register(&driver->driver);
-	if (res)
+	if (res){
+		pr_info("i2c driver name is [%s], res is [%d]\n", driver->driver.name, res);
 		return res;
+	}
+	pr_info("i2c driver name is [%s], after driver_register\n", driver->driver.name);
 
 	pr_debug("driver [%s] registered\n", driver->driver.name);
 
@@ -1933,7 +1941,7 @@ EXPORT_SYMBOL(i2c_clients_command);
 static int __init i2c_init(void)
 {
 	int retval;
-
+	pr_info("Jason-Lee: Entering i2c_init\n");
 	retval = of_alias_get_highest_id("i2c");
 
 	down_write(&__i2c_board_lock);
-- 
2.25.1