linux-kernel - [PATCH 04/14] staging: panel: return proper error values from attach

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Date:	Wed,  8 Apr 2015 16:50:30 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jean Delvare <jdelvare@...e.de>,
	Wolfram Sang <wsa@...-dreams.de>,
	Rodolfo Giometti <giometti@...eenne.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Mark Brown <broonie@...nel.org>,
	Willy Tarreau <willy@...a-x.org>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>
Cc:	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	netdev@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-spi@...r.kernel.org, devel@...verdev.osuosl.org,
	alsa-devel@...a-project.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 04/14] staging: panel: return proper error values from attach

now that we are monitoring the return value from attach, make the
required changes to return proper value from its attach function.

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---
 drivers/staging/panel/panel.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/panel/panel.c b/drivers/staging/panel/panel.c
index ea54fb4..61f6961 100644
--- a/drivers/staging/panel/panel.c
+++ b/drivers/staging/panel/panel.c
@@ -2188,15 +2188,15 @@ static struct notifier_block panel_notifier = {
 	0
 };
 
-static void panel_attach(struct parport *port)
+static int panel_attach(struct parport *port)
 {
 	if (port->number != parport)
-		return;
+		return -ENODEV;
 
 	if (pprt) {
 		pr_err("%s: port->number=%d parport=%d, already registered!\n",
 		       __func__, port->number, parport);
-		return;
+		return -EALREADY;
 	}
 
 	pprt = parport_register_device(port, "panel", NULL, NULL,  /* pf, kf */
@@ -2206,7 +2206,7 @@ static void panel_attach(struct parport *port)
 	if (pprt == NULL) {
 		pr_err("%s: port->number=%d parport=%d, parport_register_device() failed\n",
 		       __func__, port->number, parport);
-		return;
+		return -ENODEV;
 	}
 
 	if (parport_claim(pprt)) {
@@ -2230,7 +2230,7 @@ static void panel_attach(struct parport *port)
 			goto err_lcd_unreg;
 	}
 	register_reboot_notifier(&panel_notifier);
-	return;
+	return 0;
 
 err_lcd_unreg:
 	if (lcd.enabled)
@@ -2238,6 +2238,7 @@ err_lcd_unreg:
 err_unreg_device:
 	parport_unregister_device(pprt);
 	pprt = NULL;
+	return -ENODEV;
 }
 
 static void panel_detach(struct parport *port)
-- 
1.8.1.2

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