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staging: dgrp: implement error handling in dgrp_create_class_sysfs_files()

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There is no any error handling in dgrp_create_class_sysfs_files().
The patch adds code to check return values and propagate them to dgrp_init_module().

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>
This commit is contained in:
Alexey Khoroshilov 2013-04-06 01:14:23 +04:00 committed by Greg Kroah-Hartman
parent 70e90fb57f
commit 7e1389a9e6
3 changed files with 31 additions and 7 deletions
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2
drivers/staging/dgrp/dgrp_common.h
View File

@ -66,7 +66,7 @@ extern void dgrp_register_dpa_hook(struct proc_dir_entry *de);
extern void dgrp_dpa_data(struct nd_struct *, int, u8 *, int);
/* from dgrp_sysfs.c */
extern void dgrp_create_class_sysfs_files(void);
extern int dgrp_create_class_sysfs_files(void);
extern void dgrp_remove_class_sysfs_files(void);
extern void dgrp_create_node_class_sysfs_files(struct nd_struct *nd);

6
drivers/staging/dgrp/dgrp_driver.c
View File

@ -66,6 +66,8 @@ module_exit(dgrp_cleanup_module);
*/
static int dgrp_init_module(void)
{
int ret;
INIT_LIST_HEAD(&nd_struct_list);
spin_lock_init(&dgrp_poll_data.poll_lock);
@ -74,7 +76,9 @@ static int dgrp_init_module(void)
dgrp_poll_data.timer.function = dgrp_poll_handler;
dgrp_poll_data.timer.data = (unsigned long) &dgrp_poll_data;
dgrp_create_class_sysfs_files();
ret = dgrp_create_class_sysfs_files();
if (ret)
return ret;
dgrp_register_proc();

30
drivers/staging/dgrp/dgrp_sysfs.c
View File

@ -85,30 +85,50 @@ static struct attribute_group dgrp_global_settings_attribute_group = {
void dgrp_create_class_sysfs_files(void)
int dgrp_create_class_sysfs_files(void)
{
int ret = 0;
int max_majors = 1U << (32 - MINORBITS);
dgrp_class = class_create(THIS_MODULE, "digi_realport");
if (IS_ERR(dgrp_class))
return PTR_ERR(dgrp_class);
ret = class_create_file(dgrp_class, &class_attr_driver_version);
if (ret)
goto err_class;
dgrp_class_global_settings_dev = device_create(dgrp_class, NULL,
MKDEV(0, max_majors + 1), NULL, "driver_settings");
if (IS_ERR(dgrp_class_global_settings_dev)) {
ret = PTR_ERR(dgrp_class_global_settings_dev);
goto err_file;
}
ret = sysfs_create_group(&dgrp_class_global_settings_dev->kobj,
&dgrp_global_settings_attribute_group);
if (ret) {
pr_alert("%s: failed to create sysfs global settings device attributes.\n",
__func__);
sysfs_remove_group(&dgrp_class_global_settings_dev->kobj,
&dgrp_global_settings_attribute_group);
return;
goto err_dev1;
}
dgrp_class_nodes_dev = device_create(dgrp_class, NULL,
MKDEV(0, max_majors + 2), NULL, "nodes");
if (IS_ERR(dgrp_class_nodes_dev)) {
ret = PTR_ERR(dgrp_class_nodes_dev);
goto err_group;
}
return 0;
err_group:
sysfs_remove_group(&dgrp_class_global_settings_dev->kobj,
&dgrp_global_settings_attribute_group);
err_dev1:
device_destroy(dgrp_class, MKDEV(0, max_majors + 1));
err_file:
class_remove_file(dgrp_class, &class_attr_driver_version);
err_class:
class_destroy(dgrp_class);
return ret;
}