From 0669e5fa802fb7de3c842388059a777afac13205 Mon Sep 17 00:00:00 2001
From: Alexey Khoroshilov <khoroshilov@ispras.ru>
Date: Sun, 9 Mar 2014 01:01:34 +0400
Subject: [PATCH] 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@ispras.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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 ad5afbc1e694..bfafe7e3763a 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;
}
/*