linux-kernel - [PATCH 2/2] staging: dgap: implement proper error handling in dgap

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Message-Id: <1394312494-17083-2-git-send-email-khoroshilov@ispras.ru>
Date:	Sun,  9 Mar 2014 01:01:34 +0400
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Todza Louina <lidza.louina@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	driverdev-devel@...uxdriverproject.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH 2/2] staging: dgap: implement proper error handling in dgap_start()

dgap_start() ignored errors in class_create() and device_create().
The patch implements proper error handling.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/staging/dgap/dgap.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/dgap/dgap.c b/drivers/staging/dgap/dgap.c
index ad5afbc..bfafe7e 100644
--- a/drivers/staging/dgap/dgap.c
+++ b/drivers/staging/dgap/dgap.c
@@ -547,6 +547,7 @@ static int dgap_start(void)
 {
 	int rc = 0;
 	unsigned long flags;
+	struct device *device;
 
 	/*
 	 * make sure that the globals are
@@ -570,9 +571,18 @@ static int dgap_start(void)
 		return rc;
 
 	dgap_class = class_create(THIS_MODULE, "dgap_mgmt");
-	device_create(dgap_class, NULL,
+	if (IS_ERR(dgap_class)) {
+		rc = PTR_ERR(dgap_class);
+		goto failed_class;
+	}
+
+	device = device_create(dgap_class, NULL,
 		MKDEV(DIGI_DGAP_MAJOR, 0),
 		NULL, "dgap_mgmt");
+	if (IS_ERR(device)) {
+		rc = PTR_ERR(device);
+		goto failed_device;
+	}
 
 	/* Start the poller */
 	DGAP_LOCK(dgap_poll_lock, flags);
@@ -588,6 +598,12 @@ static int dgap_start(void)
 	dgap_driver_state = DRIVER_NEED_CONFIG_LOAD;
 
 	return rc;
+
+failed_device:
+	class_destroy(dgap_class);
+failed_class:
+	unregister_chrdev(DIGI_DGAP_MAJOR, "dgap");
+	return rc;
 }
 
 /*
-- 
1.8.3.2

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