linux-kernel - [PATCH 15/32] staging: gasket: drop gasket_cdev_get_info, use container

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Date:   Mon, 16 Jul 2018 19:09:09 -0700
From:   Todd Poynor <toddpoynor@...il.com>
To:     Rob Springer <rspringer@...gle.com>,
        John Joseph <jnjoseph@...gle.com>,
        Ben Chan <benchan@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Zhongze Hu <frankhu@...omium.org>, Simon Que <sque@...omium.org>,
        Dmitry Torokhov <dtor@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Todd Poynor <toddpoynor@...gle.com>
Subject: [PATCH 15/32] staging: gasket: drop gasket_cdev_get_info, use container_of

From: Todd Poynor <toddpoynor@...gle.com>

Remove gasket_cdev_get_info(), use container_of() directly instead,
drop unnecessary NULL checks.

Reported-by: Dmitry Torokhov <dtor@...omium.org>
Signed-off-by: Zhongze Hu <frankhu@...omium.org>
Signed-off-by: Todd Poynor <toddpoynor@...gle.com>
---
 drivers/staging/gasket/gasket_core.c | 26 ++++----------------------
 1 file changed, 4 insertions(+), 22 deletions(-)

diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c
index 4808bac93f983..ae20b7ff9569b 100644
--- a/drivers/staging/gasket/gasket_core.c
+++ b/drivers/staging/gasket/gasket_core.c
@@ -233,18 +233,6 @@ static inline int gasket_check_and_invoke_callback_nolock(
 	return ret;
 }
 
-/*
- * Retrieve device-specific data via cdev pointer.
- * @cdev_ptr: Character device pointer associated with the device.
- *
- * This function returns the pointer to the device-specific data allocated in
- * add_dev_cb for the device associated with cdev_ptr.
- */
-static struct gasket_cdev_info *gasket_cdev_get_info(struct cdev *cdev_ptr)
-{
-	return container_of(cdev_ptr, struct gasket_cdev_info, cdev);
-}
-
 /*
  * Returns nonzero if the gasket_cdev_info is owned by the current thread group
  * ID.
@@ -1095,12 +1083,9 @@ static int gasket_open(struct inode *inode, struct file *filp)
 	const struct gasket_driver_desc *driver_desc;
 	struct gasket_ownership *ownership;
 	char task_name[TASK_COMM_LEN];
-	struct gasket_cdev_info *dev_info = gasket_cdev_get_info(inode->i_cdev);
+	struct gasket_cdev_info *dev_info =
+	    container_of(inode->i_cdev, struct gasket_cdev_info, cdev);
 
-	if (!dev_info) {
-		gasket_nodev_error("Unable to retrieve device data");
-		return -EINVAL;
-	}
 	gasket_dev = dev_info->gasket_dev_ptr;
 	driver_desc = gasket_dev->internal_desc->driver_desc;
 	ownership = &dev_info->ownership;
@@ -1182,11 +1167,8 @@ static int gasket_release(struct inode *inode, struct file *file)
 	const struct gasket_driver_desc *driver_desc;
 	char task_name[TASK_COMM_LEN];
 	struct gasket_cdev_info *dev_info =
-		(struct gasket_cdev_info *)gasket_cdev_get_info(inode->i_cdev);
-	if (!dev_info) {
-		gasket_nodev_error("Unable to retrieve device data");
-		return -EINVAL;
-	}
+		container_of(inode->i_cdev, struct gasket_cdev_info, cdev);
+
 	gasket_dev = dev_info->gasket_dev_ptr;
 	driver_desc = gasket_dev->internal_desc->driver_desc;
 	ownership = &dev_info->ownership;
-- 
2.18.0.203.gfac676dfb9-goog