[PATCH 2/4] ACPI: video - properly handle errors when registering proc elements

Len Brown
2008-04-29T15:14:29Z

Have acpi_video_device_add_fs() and acpi_video_bus_add_fs()
properly unwind proc creation after error.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
drivers/acpi/video.c | 232 +++++++++++++++++++++++++-------------------------
1 files changed, 116 insertions(+), 116 deletions(-)

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 3f0e4bc..87ae791 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -1048,87 +1048,90 @@ acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)

static int acpi_video_device_add_fs(struct acpi_device *device)
{
- struct proc_dir_entry *entry = NULL;
+ struct proc_dir_entry *entry, *device_dir;
struct acpi_video_device *vid_dev;

-
- if (!device)
- return -ENODEV;
-
vid_dev = acpi_driver_data(device);
if (!vid_dev)
return -ENODEV;

- if (!acpi_device_dir(device)) {
- acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
- vid_dev->video->dir);
- if (!acpi_device_dir(device))
- return -ENODEV;
- acpi_device_dir(device)->owner = THIS_MODULE;
- }
+ device_dir = proc_mkdir(acpi_device_bid(device),
+ vid_dev->video->dir);
+ if (!device_dir)
+ return -ENOMEM;
+
+ device_dir->owner = THIS_MODULE;

/* 'info' [R] */
- entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
+ entry = create_proc_entry("info", S_IRUGO, device_dir);
if (!entry)
- return -ENODEV;
- else {
- entry->proc_fops = &acpi_video_device_info_fops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
+ goto err_remove_dir;
+
+ entry->proc_fops = &acpi_video_device_info_fops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;

/* 'state' [R/W] */
- entry =
- create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
- acpi_device_dir(device));
+ entry = create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
+ device_dir);
if (!entry)
- return -ENODEV;
- else {
- acpi_video_device_state_fops.write = acpi_video_device_write_state;
- entry->proc_fops = &acpi_video_device_state_fops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
+ goto err_remove_info;
+
+ acpi_video_device_state_fops.write = acpi_video_device_write_state;
+ entry->proc_fops = &acpi_video_device_state_fops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;

/* 'brightness' [R/W] */
- entry =
- create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
- acpi_device_dir(device));
+ entry = create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
+ device_dir);
if (!entry)
- return -ENODEV;
- else {
- acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
- entry->proc_fops = &acpi_video_device_brightness_fops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
+ goto err_remove_state;
+
+ acpi_video_device_brightness_fops.write =
+ acpi_video_device_write_brightness;
+ entry->proc_fops = &acpi_video_device_brightness_fops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;

/* 'EDID' [R] */
- entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
+ entry = create_proc_entry("EDID", S_IRUGO, device_dir);
if (!entry)
- return -ENODEV;
- else {
- entry->proc_fops = &acpi_video_device_EDID_fops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
+ goto err_remove_brightness;

+ entry->proc_fops = &acpi_video_device_EDID_fops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;
+
+ acpi_device_dir(device) = device_dir;
return 0;
+
+ err_remove_brightness:
+ remove_proc_entry("brightness", device_dir);
+ err_remove_state:
+ remove_proc_entry("state", device_dir);
+ err_remove_info:
+ remove_proc_entry("info", device_dir);
+ err_remove_dir:
+ remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
+ return -ENOMEM;
}

static int acpi_video_device_remove_fs(struct acpi_device *device)
{
struct acpi_video_device *vid_dev;
+ struct proc_dir_entry *device_dir;

vid_dev = acpi_driver_data(device);
if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
return -ENODEV;

- if (acpi_device_dir(device)) {
- remove_proc_entry("info", acpi_device_dir(device));
- remove_proc_entry("state", acpi_device_dir(device));
- remove_proc_entry("brightness", acpi_device_dir(device));
- remove_proc_entry("EDID", acpi_device_dir(device));
+ device_dir = acpi_device_dir(device);
+ if (device_dir) {
+ remove_proc_entry("info", device_dir);
+ remove_proc_entry("state", device_dir);
+ remove_proc_entry("brightness", device_dir);
+ remove_proc_entry("EDID", device_dir);
remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
acpi_device_dir(device) = NULL;
}
@@ -1335,94 +1338,91 @@ acpi_video_bus_write_DOS(struct file *file,

static int acpi_video_bus_add_fs(struct acpi_device *device)
{
- struct proc_dir_entry *entry = NULL;
- struct acpi_video_bus *video;
-
+ struct acpi_video_bus *video = acpi_driver_data(device);
+ struct proc_dir_entry *device_dir;
+ struct proc_dir_entry *entry;

- video = acpi_driver_data(device);
+ device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
+ if (!device_dir)
+ return -ENOMEM;

- if (!acpi_device_dir(device)) {
- acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
- acpi_video_dir);
- if (!acpi_device_dir(device))
- return -ENODEV;
- video->dir = acpi_device_dir(device);
- acpi_device_dir(device)->owner = THIS_MODULE;
- }
+ device_dir->owner = THIS_MODULE;

/* 'info' [R] */
- entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
+ entry = create_proc_entry("info", S_IRUGO, device_dir);
if (!entry)
- return -ENODEV;
- else {
- entry->proc_fops = &acpi_video_bus_info_fops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
+ goto err_remove_dir;
+
+ entry->proc_fops = &acpi_video_bus_info_fops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;

/* 'ROM' [R] */
- entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
+ entry = create_proc_entry("ROM", S_IRUGO, device_dir);
if (!entry)
- return -ENODEV;
- else {
- entry->proc_fops = &acpi_video_bus_ROM_fops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
+ goto err_remove_info;
+
+ entry->proc_fops = &acpi_video_bus_ROM_fops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;

/* 'POST_info' [R] */
- entry =
- create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
+ entry = create_proc_entry("POST_info", S_IRUGO, device_dir);
if (!entry)
- return -ENODEV;
- else {
- entry->proc_fops = &acpi_video_bus_POST_info_fops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
+ goto err_remove_rom;
+
+ entry->proc_fops = &acpi_video_bus_POST_info_fops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;

/* 'POST' [R/W] */
- entry =
- create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
- acpi_device_dir(device));
+ entry = create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
+ device_dir);
if (!entry)
- return -ENODEV;
- else {
- acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
- entry->proc_fops = &acpi_video_bus_POST_fops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
+ goto err_remove_post_info;
+
+ acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
+ entry->proc_fops = &acpi_video_bus_POST_fops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;

/* 'DOS' [R/W] */
- entry =
- create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
- acpi_device_dir(device));
+ entry = create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
+ device_dir);
if (!entry)
- return -ENODEV;
- else {
- acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
- entry->proc_fops = &acpi_video_bus_DOS_fops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
+ goto err_remove_post;
+
+ acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
+ entry->proc_fops = &acpi_video_bus_DOS_fops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;

+ video->dir = acpi_device_dir(device) = device_dir;
return 0;
+
+ err_remove_post:
+ remove_proc_entry("POST", device_dir);
+ err_remove_post_info:
+ remove_proc_entry("POST_info", device_dir);
+ err_remove_rom:
+ remove_proc_entry("ROM", device_dir);
+ err_remove_info:
+ remove_proc_entry("info", device_dir);
+ err_remove_dir:
+ remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
+ return -ENOMEM;
}

static int acpi_video_bus_remove_fs(struct acpi_device *device)
{
- struct acpi_video_bus *video;
-
-
- video = acpi_driver_data(device);
+ struct proc_dir_entry *device_dir = acpi_device_dir(device);

- if (acpi_device_dir(device)) {
- remove_proc_entry("info", acpi_device_dir(device));
- remove_proc_entry("ROM", acpi_device_dir(device));
- remove_proc_entry("POST_info", acpi_device_dir(device));
- remove_proc_entry("POST", acpi_device_dir(device));
- remove_proc_entry("DOS", acpi_device_dir(device));
+ if (device_dir) {
+ remove_proc_entry("info", device_dir);
+ remove_proc_entry("ROM", device_dir);
+ remove_proc_entry("POST_info", device_dir);
+ remove_proc_entry("POST", device_dir);
+ remove_proc_entry("DOS", device_dir);
remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
acpi_device_dir(device) = NULL;
}
--
1.5.5.1.99.gf0ec4