linux-kernel - [PATCH 02/14] staging: gasket: remove duplicate call to retrieve device callback

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Date:   Sat, 21 Jul 2018 06:34:55 -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>,
        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 02/14] staging: gasket: remove duplicate call to retrieve device callback

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

gasket_handle_ioctl() calls gasket_get_ioctl_permissions_cb() twice;
simplify the code and avoid duplicated work by fetching the callback
pointer only once.

Reported-by: Dmitry Torokhov <dtor@...omium.org>
Signed-off-by: Todd Poynor <toddpoynor@...gle.com>
---
 drivers/staging/gasket/gasket_ioctl.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/gasket/gasket_ioctl.c b/drivers/staging/gasket/gasket_ioctl.c
index 2e2c9b997093b..dbe9fdef0c268 100644
--- a/drivers/staging/gasket/gasket_ioctl.c
+++ b/drivers/staging/gasket/gasket_ioctl.c
@@ -55,14 +55,15 @@ long gasket_handle_ioctl(struct file *filp, uint cmd, void __user *argp)
 {
 	struct gasket_dev *gasket_dev;
 	unsigned long arg = (unsigned long)argp;
+	gasket_ioctl_permissions_cb_t ioctl_permissions_cb;
 	int retval;
 
 	gasket_dev = (struct gasket_dev *)filp->private_data;
 	trace_gasket_ioctl_entry(gasket_dev->dev_info.name, cmd);
 
-	if (gasket_get_ioctl_permissions_cb(gasket_dev)) {
-		retval = gasket_get_ioctl_permissions_cb(gasket_dev)(
-			filp, cmd, argp);
+	ioctl_permissions_cb = gasket_get_ioctl_permissions_cb(gasket_dev);
+	if (ioctl_permissions_cb) {
+		retval = ioctl_permissions_cb(filp, cmd, argp);
 		if (retval < 0) {
 			trace_gasket_ioctl_exit(-EPERM);
 			return retval;
-- 
2.18.0.233.g985f88cf7e-goog