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linux-sg2042
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Input: uinput - convert to dynalloc allocation 

Also introduce proper locking when creating/deleting device.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2005-11-20 00:51:22 -05:00
parent e753b650e1
commit 29506415a0
2 changed files with 170 additions and 154 deletions
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292
drivers/input/misc/uinput.c
View File

@ -152,37 +152,41 @@ static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
return retval;
}
static void uinput_destroy_device(struct uinput_device *udev)
{
const char *name, *phys;
if (udev->dev) {
name = udev->dev->name;
phys = udev->dev->phys;
if (udev->state == UIST_CREATED)
input_unregister_device(udev->dev);
else
input_free_device(udev->dev);
kfree(name);
kfree(phys);
udev->dev = NULL;
}
udev->state = UIST_NEW_DEVICE;
}
static int uinput_create_device(struct uinput_device *udev)
{
if (!udev->dev->name) {
int error;
if (udev->state != UIST_SETUP_COMPLETE) {
printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
return -EINVAL;
}
udev->dev->event = uinput_dev_event;
udev->dev->upload_effect = uinput_dev_upload_effect;
udev->dev->erase_effect = uinput_dev_erase_effect;
udev->dev->private = udev;
init_waitqueue_head(&udev->waitq);
input_register_device(udev->dev);
set_bit(UIST_CREATED, &udev->state);
return 0;
error = input_register_device(udev->dev);
if (error) {
uinput_destroy_device(udev);
return error;
}
static int uinput_destroy_device(struct uinput_device *udev)
{
if (!test_bit(UIST_CREATED, &udev->state)) {
printk(KERN_WARNING "%s: create the device first\n", UINPUT_NAME);
return -EINVAL;
}
input_unregister_device(udev->dev);
clear_bit(UIST_CREATED, &udev->state);
udev->state = UIST_CREATED;
return 0;
}
@ -190,29 +194,20 @@ static int uinput_destroy_device(struct uinput_device *udev)
static int uinput_open(struct inode *inode, struct file *file)
{
struct uinput_device *newdev;
struct input_dev *newinput;
newdev = kmalloc(sizeof(struct uinput_device), GFP_KERNEL);
newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
if (!newdev)
goto error;
memset(newdev, 0, sizeof(struct uinput_device));
return -ENOMEM;
init_MUTEX(&newdev->sem);
spin_lock_init(&newdev->requests_lock);
init_waitqueue_head(&newdev->requests_waitq);
newinput = kmalloc(sizeof(struct input_dev), GFP_KERNEL);
if (!newinput)
goto cleanup;
memset(newinput, 0, sizeof(struct input_dev));
newdev->dev = newinput;
init_waitqueue_head(&newdev->waitq);
newdev->state = UIST_NEW_DEVICE;
file->private_data = newdev;
return 0;
cleanup:
kfree(newdev);
error:
return -ENOMEM;
}
static int uinput_validate_absbits(struct input_dev *dev)
@ -246,34 +241,55 @@ static int uinput_validate_absbits(struct input_dev *dev)
return retval;
}
static int uinput_alloc_device(struct file *file, const char __user *buffer, size_t count)
static int uinput_allocate_device(struct uinput_device *udev)
{
udev->dev = input_allocate_device();
if (!udev->dev)
return -ENOMEM;
udev->dev->event = uinput_dev_event;
udev->dev->upload_effect = uinput_dev_upload_effect;
udev->dev->erase_effect = uinput_dev_erase_effect;
udev->dev->private = udev;
return 0;
}
static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count)
{
struct uinput_user_dev *user_dev;
struct input_dev *dev;
struct uinput_device *udev;
char *name;
int size;
int retval;
retval = count;
if (count != sizeof(struct uinput_user_dev))
return -EINVAL;
if (!udev->dev) {
retval = uinput_allocate_device(udev);
if (retval)
return retval;
}
udev = file->private_data;
dev = udev->dev;
user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
if (!user_dev) {
retval = -ENOMEM;
goto exit;
}
if (!user_dev)
return -ENOMEM;
if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
retval = -EFAULT;
goto exit;
}
kfree(dev->name);
size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
if (!size) {
retval = -EINVAL;
goto exit;
}
kfree(dev->name);
dev->name = name = kmalloc(size, GFP_KERNEL);
if (!name) {
retval = -ENOMEM;
@ -296,32 +312,50 @@ static int uinput_alloc_device(struct file *file, const char __user *buffer, siz
/* check if absmin/absmax/absfuzz/absflat are filled as
* told in Documentation/input/input-programming.txt */
if (test_bit(EV_ABS, dev->evbit)) {
int err = uinput_validate_absbits(dev);
if (err < 0) {
retval = err;
kfree(dev->name);
}
retval = uinput_validate_absbits(dev);
if (retval < 0)
goto exit;
}
udev->state = UIST_SETUP_COMPLETE;
retval = count;
exit:
kfree(user_dev);
return retval;
}
static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count)
{
struct uinput_device *udev = file->private_data;
if (test_bit(UIST_CREATED, &udev->state)) {
struct input_event ev;
if (count != sizeof(struct input_event))
return -EINVAL;
if (copy_from_user(&ev, buffer, sizeof(struct input_event)))
return -EFAULT;
input_event(udev->dev, ev.type, ev.code, ev.value);
} else
count = uinput_alloc_device(file, buffer, count);
return count;
input_event(udev->dev, ev.type, ev.code, ev.value);
return sizeof(struct input_event);
}
static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
{
struct uinput_device *udev = file->private_data;
int retval;
retval = down_interruptible(&udev->sem);
if (retval)
return retval;
retval = udev->state == UIST_CREATED ?
uinput_inject_event(udev, buffer, count) :
uinput_setup_device(udev, buffer, count);
up(&udev->sem);
return retval;
}
static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
@ -329,28 +363,38 @@ static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count,
struct uinput_device *udev = file->private_data;
int retval = 0;
if (!test_bit(UIST_CREATED, &udev->state))
if (udev->state != UIST_CREATED)
return -ENODEV;
if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
return -EAGAIN;
retval = wait_event_interruptible(udev->waitq,
udev->head != udev->tail || !test_bit(UIST_CREATED, &udev->state));
udev->head != udev->tail || udev->state != UIST_CREATED);
if (retval)
return retval;
if (!test_bit(UIST_CREATED, &udev->state))
return -ENODEV;
retval = down_interruptible(&udev->sem);
if (retval)
return retval;
while ((udev->head != udev->tail) &&
(retval + sizeof(struct input_event) <= count)) {
if (copy_to_user(buffer + retval, &udev->buff[udev->tail], sizeof(struct input_event)))
return -EFAULT;
if (udev->state != UIST_CREATED) {
retval = -ENODEV;
goto out;
}
while (udev->head != udev->tail && retval + sizeof(struct input_event) <= count) {
if (copy_to_user(buffer + retval, &udev->buff[udev->tail], sizeof(struct input_event))) {
retval = -EFAULT;
goto out;
}
udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
retval += sizeof(struct input_event);
}
out:
up(&udev->sem);
return retval;
}
@ -366,28 +410,30 @@ static unsigned int uinput_poll(struct file *file, poll_table *wait)
return 0;
}
static int uinput_burn_device(struct uinput_device *udev)
static int uinput_release(struct inode *inode, struct file *file)
{
if (test_bit(UIST_CREATED, &udev->state))
uinput_destroy_device(udev);
struct uinput_device *udev = file->private_data;
kfree(udev->dev->name);
kfree(udev->dev->phys);
kfree(udev->dev);
uinput_destroy_device(udev);
kfree(udev);
return 0;
}
static int uinput_close(struct inode *inode, struct file *file)
{
uinput_burn_device(file->private_data);
return 0;
}
#define uinput_set_bit(_arg, _bit, _max) \
({ \
int __ret = 0; \
if (udev->state == UIST_CREATED) \
__ret = -EINVAL; \
else if ((_arg) > (_max)) \
__ret = -EINVAL; \
else set_bit((_arg), udev->dev->_bit); \
__ret; \
})
static int uinput_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int retval = 0;
int retval;
struct uinput_device *udev;
void __user *p = (void __user *)arg;
struct uinput_ff_upload ff_up;
@ -398,19 +444,14 @@ static int uinput_ioctl(struct inode *inode, struct file *file, unsigned int cmd
udev = file->private_data;
/* device attributes can not be changed after the device is created */
switch (cmd) {
case UI_SET_EVBIT:
case UI_SET_KEYBIT:
case UI_SET_RELBIT:
case UI_SET_ABSBIT:
case UI_SET_MSCBIT:
case UI_SET_LEDBIT:
case UI_SET_SNDBIT:
case UI_SET_FFBIT:
case UI_SET_PHYS:
if (test_bit(UIST_CREATED, &udev->state))
return -EINVAL;
retval = down_interruptible(&udev->sem);
if (retval)
return retval;
if (!udev->dev) {
retval = uinput_allocate_device(udev);
if (retval)
goto out;
}
switch (cmd) {
@ -419,74 +460,46 @@ static int uinput_ioctl(struct inode *inode, struct file *file, unsigned int cmd
break;
case UI_DEV_DESTROY:
retval = uinput_destroy_device(udev);
uinput_destroy_device(udev);
break;
case UI_SET_EVBIT:
if (arg > EV_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->evbit);
retval = uinput_set_bit(arg, evbit, EV_MAX);
break;
case UI_SET_KEYBIT:
if (arg > KEY_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->keybit);
retval = uinput_set_bit(arg, keybit, KEY_MAX);
break;
case UI_SET_RELBIT:
if (arg > REL_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->relbit);
retval = uinput_set_bit(arg, relbit, REL_MAX);
break;
case UI_SET_ABSBIT:
if (arg > ABS_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->absbit);
retval = uinput_set_bit(arg, absbit, ABS_MAX);
break;
case UI_SET_MSCBIT:
if (arg > MSC_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->mscbit);
retval = uinput_set_bit(arg, mscbit, MSC_MAX);
break;
case UI_SET_LEDBIT:
if (arg > LED_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->ledbit);
retval = uinput_set_bit(arg, ledbit, LED_MAX);
break;
case UI_SET_SNDBIT:
if (arg > SND_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->sndbit);
retval = uinput_set_bit(arg, sndbit, SND_MAX);
break;
case UI_SET_FFBIT:
if (arg > FF_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->ffbit);
retval = uinput_set_bit(arg, ffbit, FF_MAX);
break;
case UI_SET_PHYS:
if (udev->state == UIST_CREATED) {
retval = -EINVAL;
goto out;
}
length = strnlen_user(p, 1024);
if (length <= 0) {
retval = -EFAULT;
@ -575,17 +588,20 @@ static int uinput_ioctl(struct inode *inode, struct file *file, unsigned int cmd
default:
retval = -EINVAL;
}
out:
up(&udev->sem);
return retval;
}
static struct file_operations uinput_fops = {
.owner = THIS_MODULE,
.open = uinput_open,
.release = uinput_close,
.release = uinput_release,
.read = uinput_read,
.write = uinput_write,
.poll = uinput_poll,
.ioctl = uinput_ioctl,
.unlocked_ioctl = uinput_ioctl,
};
static struct miscdevice uinput_misc = {

12
include/linux/uinput.h
View File

@ -34,8 +34,7 @@
#define UINPUT_BUFFER_SIZE 16
#define UINPUT_NUM_REQUESTS 16
/* state flags => bit index for {set|clear|test}_bit ops */
#define UIST_CREATED 0
enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED };
struct uinput_request {
int id;
@ -52,11 +51,12 @@ struct uinput_request {
struct uinput_device {
struct input_dev *dev;
unsigned long state;
struct semaphore sem;
enum uinput_state state;
wait_queue_head_t waitq;
unsigned char ready,
head,
tail;
unsigned char ready;
unsigned char head;
unsigned char tail;
struct input_event buff[UINPUT_BUFFER_SIZE];
struct uinput_request *requests[UINPUT_NUM_REQUESTS];