linux-kernel - [PATCH v2 2/2] ppdev: return proper error values from attach

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Date:	Wed,  8 Apr 2015 19:00:17 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, dan.carpenter@...cle.com,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH v2 2/2] ppdev: return proper error values from attach

As of now, parport_register_driver() never fails, so even if
device_create() fails for some reason we will still think that the
module has initialized properly.
lets start using attach_ret and return the proper return value from
device_create(), so that if device_create fails for some reason then
module_init will also fail.

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---
 drivers/char/ppdev.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
index ae0b42b..ed38071 100644
--- a/drivers/char/ppdev.c
+++ b/drivers/char/ppdev.c
@@ -748,10 +748,14 @@ static const struct file_operations pp_fops = {
 	.release	= pp_release,
 };
 
-static void pp_attach(struct parport *port)
+static int pp_attach(struct parport *port)
 {
-	device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number),
-		      NULL, "parport%d", port->number);
+	struct device *dev;
+
+	dev = device_create(ppdev_class, port->dev,
+			    MKDEV(PP_MAJOR, port->number), NULL,
+			    "parport%d", port->number);
+	return PTR_ERR_OR_ZERO(dev);
 }
 
 static void pp_detach(struct parport *port)
@@ -761,7 +765,7 @@ static void pp_detach(struct parport *port)
 
 static struct parport_driver pp_driver = {
 	.name		= CHRDEV,
-	.attach		= pp_attach,
+	.attach_ret	= pp_attach,
 	.detach		= pp_detach,
 };
 
-- 
1.8.1.2

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