linux-kernel - [PATCH] Input: gameport - provide default trigger() and read()

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <ZGvoqP5PAAsJuky4@google.com>
Date:   Mon, 22 May 2023 15:11:52 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     linux-input@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] Input: gameport - provide default trigger() and read()

Instead of constantly checking pointer(s) for non-NULL-ness provide
default implementations of trigger() and read() and instantiate them during
pore registration if driver-specific versions were not provided.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/input/gameport/gameport.c | 17 ++++++++++++++++-
 include/linux/gameport.h          | 11 ++---------
 2 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
index db58a01b23d3..26e197942ff9 100644
--- a/drivers/input/gameport/gameport.c
+++ b/drivers/input/gameport/gameport.c
@@ -21,7 +21,7 @@
 #include <linux/mutex.h>
 #include <linux/timekeeping.h>
 
-/*#include <asm/io.h>*/
+#include <asm/io.h>
 
 MODULE_AUTHOR("Vojtech Pavlik <vojtech@....cz>");
 MODULE_DESCRIPTION("Generic gameport layer");
@@ -518,6 +518,16 @@ void gameport_set_phys(struct gameport *gameport, const char *fmt, ...)
 }
 EXPORT_SYMBOL(gameport_set_phys);
 
+static void gameport_default_trigger(struct gameport *gameport)
+{
+	outb(0xff, gameport->io);
+}
+
+static unsigned char gameport_default_read(struct gameport *gameport)
+{
+	return inb(gameport->io);
+}
+
 /*
  * Prepare gameport port for registration.
  */
@@ -536,6 +546,11 @@ static void gameport_init_port(struct gameport *gameport)
 	if (gameport->parent)
 		gameport->dev.parent = &gameport->parent->dev;
 
+	if (!gameport->trigger)
+		gameport->trigger = gameport_default_trigger;
+	if (!gameport->read)
+		gameport->read = gameport_default_read;
+
 	INIT_LIST_HEAD(&gameport->node);
 	spin_lock_init(&gameport->timer_lock);
 	timer_setup(&gameport->poll_timer, gameport_run_poll_handler, 0);
diff --git a/include/linux/gameport.h b/include/linux/gameport.h
index 8c2f00018e89..0a221e768ea4 100644
--- a/include/linux/gameport.h
+++ b/include/linux/gameport.h
@@ -5,7 +5,6 @@
 #ifndef _GAMEPORT_H
 #define _GAMEPORT_H
 
-#include <asm/io.h>
 #include <linux/types.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
@@ -165,18 +164,12 @@ void gameport_unregister_driver(struct gameport_driver *drv);
 
 static inline void gameport_trigger(struct gameport *gameport)
 {
-	if (gameport->trigger)
-		gameport->trigger(gameport);
-	else
-		outb(0xff, gameport->io);
+	gameport->trigger(gameport);
 }
 
 static inline unsigned char gameport_read(struct gameport *gameport)
 {
-	if (gameport->read)
-		return gameport->read(gameport);
-	else
-		return inb(gameport->io);
+	return gameport->read(gameport);
 }
 
 static inline int gameport_cooked_read(struct gameport *gameport, int *axes, int *buttons)
-- 
2.40.1.698.g37aff9b760-goog

-- 
Dmitry