linux-kernel - [PATCH 1/2] staging: panel: register driver after checking device

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Date:	Tue, 10 Feb 2015 17:26:02 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Willy Tarreau <willy@...a-x.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] staging: panel: register driver after checking device

register the driver only if lcd or keypad has been enabled and if
both are disabled then just exit.

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---
 drivers/staging/panel/panel.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/staging/panel/panel.c b/drivers/staging/panel/panel.c
index 6ed35b6..df044b2 100644
--- a/drivers/staging/panel/panel.c
+++ b/drivers/staging/panel/panel.c
@@ -2379,23 +2379,17 @@ static int __init panel_init_module(void)
 	/* tells various subsystems about the fact that we are initializing */
 	init_in_progress = 1;
 
-	if (parport_register_driver(&panel_driver)) {
-		pr_err("could not register with parport. Aborting.\n");
-		return -EIO;
-	}
-
 	if (!lcd.enabled && !keypad.enabled) {
-		/* no device enabled, let's release the parport */
-		if (pprt) {
-			parport_release(pprt);
-			parport_unregister_device(pprt);
-			pprt = NULL;
-		}
-		parport_unregister_driver(&panel_driver);
+		/* no device enabled, let's exit */
 		pr_err("driver version " PANEL_VERSION " disabled.\n");
 		return -ENODEV;
 	}
 
+	if (parport_register_driver(&panel_driver)) {
+		pr_err("could not register with parport. Aborting.\n");
+		return -EIO;
+	}
+
 	register_reboot_notifier(&panel_notifier);
 
 	if (pprt)
-- 
1.8.1.2

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