1 files changed, 107 insertions, 68 deletions

diff --git a/drivers/input/tsdev.c b/drivers/input/tsdev.c
index 05dfc10bc079..5e5b5c91d75b 100644
--- a/drivers/input/tsdev.c
+++ b/drivers/input/tsdev.c
@@ -111,13 +111,13 @@ struct tsdev {
         int minor;
         char name[8];
         wait_queue_head_t wait;
-        struct list_head list;
+        struct list_head client_list;
         struct input_handle handle;
         int x, y, pressure;
         struct ts_calibration cal;
 };
 
-struct tsdev_list {
+struct tsdev_client {
         struct fasync_struct *fasync;
         struct list_head node;
         struct tsdev *tsdev;
@@ -139,38 +139,49 @@ static struct tsdev *tsdev_table[TSDEV_MINORS/2];
 
 static int tsdev_fasync(int fd, struct file *file, int on)
 {
-        struct tsdev_list *list = file->private_data;
+        struct tsdev_client *client = file->private_data;
         int retval;
 
-        retval = fasync_helper(fd, file, on, &list->fasync);
+        retval = fasync_helper(fd, file, on, &client->fasync);
         return retval < 0 ? retval : 0;
 }
 
 static int tsdev_open(struct inode *inode, struct file *file)
 {
         int i = iminor(inode) - TSDEV_MINOR_BASE;
-        struct tsdev_list *list;
+        struct tsdev_client *client;
+        struct tsdev *tsdev;
+        int error;
 
         printk(KERN_WARNING "tsdev (compaq touchscreen emulation) is scheduled "
                 "for removal.\nSee Documentation/feature-removal-schedule.txt "
                 "for details.\n");
 
-        if (i >= TSDEV_MINORS || !tsdev_table[i & TSDEV_MINOR_MASK])
+        if (i >= TSDEV_MINORS)
+                return -ENODEV;
+
+        tsdev = tsdev_table[i & TSDEV_MINOR_MASK];
+        if (!tsdev || !tsdev->exist)
                 return -ENODEV;
 
-        if (!(list = kzalloc(sizeof(struct tsdev_list), GFP_KERNEL)))
+        client = kzalloc(sizeof(struct tsdev_client), GFP_KERNEL);
+        if (!client)
                 return -ENOMEM;
 
-        list->raw = (i >= TSDEV_MINORS/2) ? 1 : 0;
+        client->tsdev = tsdev;
+        client->raw = (i >= TSDEV_MINORS / 2) ? 1 : 0;
+        list_add_tail(&client->node, &tsdev->client_list);
 
-        i &= TSDEV_MINOR_MASK;
-        list->tsdev = tsdev_table[i];
-        list_add_tail(&list->node, &tsdev_table[i]->list);
-        file->private_data = list;
+        if (!tsdev->open++ && tsdev->exist) {
+                error = input_open_device(&tsdev->handle);
+                if (error) {
+                        list_del(&client->node);
+                        kfree(client);
+                        return error;
+                }
+        }
 
-        if (!list->tsdev->open++)
-                if (list->tsdev->exist)
-                        input_open_device(&list->tsdev->handle);
+        file->private_data = client;
         return 0;
 }
 
@@ -182,45 +193,48 @@ static void tsdev_free(struct tsdev *tsdev)
 
 static int tsdev_release(struct inode *inode, struct file *file)
 {
-        struct tsdev_list *list = file->private_data;
+        struct tsdev_client *client = file->private_data;
+        struct tsdev *tsdev = client->tsdev;
 
         tsdev_fasync(-1, file, 0);
-        list_del(&list->node);
 
-        if (!--list->tsdev->open) {
-                if (list->tsdev->exist)
-                        input_close_device(&list->tsdev->handle);
+        list_del(&client->node);
+        kfree(client);
+
+        if (!--tsdev->open) {
+                if (tsdev->exist)
+                        input_close_device(&tsdev->handle);
                 else
-                        tsdev_free(list->tsdev);
+                        tsdev_free(tsdev);
         }
-        kfree(list);
+
         return 0;
 }
 
 static ssize_t tsdev_read(struct file *file, char __user *buffer, size_t count,
-                          loff_t * ppos)
+                          loff_t *ppos)
 {
-        struct tsdev_list *list = file->private_data;
+        struct tsdev_client *client = file->private_data;
+        struct tsdev *tsdev = client->tsdev;
         int retval = 0;
 
-        if (list->head == list->tail && list->tsdev->exist && (file->f_flags & O_NONBLOCK))
+        if (client->head == client->tail && tsdev->exist && (file->f_flags & O_NONBLOCK))
                 return -EAGAIN;
 
-        retval = wait_event_interruptible(list->tsdev->wait,
-                        list->head != list->tail || !list->tsdev->exist);
-
+        retval = wait_event_interruptible(tsdev->wait,
+                        client->head != client->tail || !tsdev->exist);
         if (retval)
                 return retval;
 
-        if (!list->tsdev->exist)
+        if (!tsdev->exist)
                 return -ENODEV;
 
-        while (list->head != list->tail &&
+        while (client->head != client->tail &&
                retval + sizeof (struct ts_event) <= count) {
-                if (copy_to_user (buffer + retval, list->event + list->tail,
+                if (copy_to_user (buffer + retval, client->event + client->tail,
                                   sizeof (struct ts_event)))
                         return -EFAULT;
-                list->tail = (list->tail + 1) & (TSDEV_BUFFER_SIZE - 1);
+                client->tail = (client->tail + 1) & (TSDEV_BUFFER_SIZE - 1);
                 retval += sizeof (struct ts_event);
         }
 
@@ -228,32 +242,33 @@ static ssize_t tsdev_read(struct file *file, char __user *buffer, size_t count,
 }
 
 /* No kernel lock - fine */
-static unsigned int tsdev_poll(struct file *file, poll_table * wait)
+static unsigned int tsdev_poll(struct file *file, poll_table *wait)
 {
-        struct tsdev_list *list = file->private_data;
+        struct tsdev_client *client = file->private_data;
+        struct tsdev *tsdev = client->tsdev;
 
-        poll_wait(file, &list->tsdev->wait, wait);
-        return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) |
-                (list->tsdev->exist ? 0 : (POLLHUP | POLLERR));
+        poll_wait(file, &tsdev->wait, wait);
+        return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
+                (tsdev->exist ? 0 : (POLLHUP | POLLERR));
 }
 
 static int tsdev_ioctl(struct inode *inode, struct file *file,
                        unsigned int cmd, unsigned long arg)
 {
-        struct tsdev_list *list = file->private_data;
-        struct tsdev *tsdev = list->tsdev;
+        struct tsdev_client *client = file->private_data;
+        struct tsdev *tsdev = client->tsdev;
         int retval = 0;
 
         switch (cmd) {
         case TS_GET_CAL:
-                if (copy_to_user ((void __user *)arg, &tsdev->cal,
-                                  sizeof (struct ts_calibration)))
+                if (copy_to_user((void __user *)arg, &tsdev->cal,
+                                 sizeof (struct ts_calibration)))
                         retval = -EFAULT;
                 break;
 
         case TS_SET_CAL:
-                if (copy_from_user (&tsdev->cal, (void __user *)arg,
-                                    sizeof (struct ts_calibration)))
+                if (copy_from_user(&tsdev->cal, (void __user *)arg,
+                                   sizeof (struct ts_calibration)))
                         retval = -EFAULT;
                 break;
 
@@ -279,7 +294,7 @@ static void tsdev_event(struct input_handle *handle, unsigned int type,
                         unsigned int code, int value)
 {
         struct tsdev *tsdev = handle->private;
-        struct tsdev_list *list;
+        struct tsdev_client *client;
         struct timeval time;
 
         switch (type) {
@@ -343,18 +358,18 @@ static void tsdev_event(struct input_handle *handle, unsigned int type,
         if (type != EV_SYN || code != SYN_REPORT)
                 return;
 
-        list_for_each_entry(list, &tsdev->list, node) {
+        list_for_each_entry(client, &tsdev->client_list, node) {
                 int x, y, tmp;
 
                 do_gettimeofday(&time);
-                list->event[list->head].millisecs = time.tv_usec / 100;
-                list->event[list->head].pressure = tsdev->pressure;
+                client->event[client->head].millisecs = time.tv_usec / 100;
+                client->event[client->head].pressure = tsdev->pressure;
 
                 x = tsdev->x;
                 y = tsdev->y;
 
                 /* Calibration */
-                if (!list->raw) {
+                if (!client->raw) {
                         x = ((x * tsdev->cal.xscale) >> 8) + tsdev->cal.xtrans;
                         y = ((y * tsdev->cal.yscale) >> 8) + tsdev->cal.ytrans;
                         if (tsdev->cal.xyswap) {
@@ -362,33 +377,35 @@ static void tsdev_event(struct input_handle *handle, unsigned int type,
                         }
                 }
 
-                list->event[list->head].x = x;
-                list->event[list->head].y = y;
-                list->head = (list->head + 1) & (TSDEV_BUFFER_SIZE - 1);
-                kill_fasync(&list->fasync, SIGIO, POLL_IN);
+                client->event[client->head].x = x;
+                client->event[client->head].y = y;
+                client->head = (client->head + 1) & (TSDEV_BUFFER_SIZE - 1);
+                kill_fasync(&client->fasync, SIGIO, POLL_IN);
         }
         wake_up_interruptible(&tsdev->wait);
 }
 
-static struct input_handle *tsdev_connect(struct input_handler *handler,
-                                          struct input_dev *dev,
-                                          const struct input_device_id *id)
+static int tsdev_connect(struct input_handler *handler, struct input_dev *dev,
+                         const struct input_device_id *id)
 {
         struct tsdev *tsdev;
         struct class_device *cdev;
+        dev_t devt;
         int minor, delta;
+        int error;
 
         for (minor = 0; minor < TSDEV_MINORS / 2 && tsdev_table[minor]; minor++);
         if (minor >= TSDEV_MINORS / 2) {
                 printk(KERN_ERR
                        "tsdev: You have way too many touchscreens\n");
-                return NULL;
+                return -ENFILE;
         }
 
-        if (!(tsdev = kzalloc(sizeof(struct tsdev), GFP_KERNEL)))
-                return NULL;
+        tsdev = kzalloc(sizeof(struct tsdev), GFP_KERNEL);
+        if (!tsdev)
+                return -ENOMEM;
 
-        INIT_LIST_HEAD(&tsdev->list);
+        INIT_LIST_HEAD(&tsdev->client_list);
         init_waitqueue_head(&tsdev->wait);
 
         sprintf(tsdev->name, "ts%d", minor);
@@ -415,21 +432,43 @@ static struct input_handle *tsdev_connect(struct input_handler *handler,
 
         tsdev_table[minor] = tsdev;
 
-        cdev = class_device_create(&input_class, &dev->cdev,
-                        MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor),
-                        dev->cdev.dev, tsdev->name);
+        devt = MKDEV(INPUT_MAJOR, TSDEV_MINOR_BASE + minor),
+
+        cdev = class_device_create(&input_class, &dev->cdev, devt,
+                                   dev->cdev.dev, tsdev->name);
+        if (IS_ERR(cdev)) {
+                error = PTR_ERR(cdev);
+                goto err_free_tsdev;
+        }
 
         /* temporary symlink to keep userspace happy */
-        sysfs_create_link(&input_class.subsys.kobj, &cdev->kobj,
-                          tsdev->name);
+        error = sysfs_create_link(&input_class.subsys.kobj,
+                                  &cdev->kobj, tsdev->name);
+        if (error)
+                goto err_cdev_destroy;
+
+        error = input_register_handle(&tsdev->handle);
+        if (error)
+                goto err_remove_link;
+
+        return 0;
 
-        return &tsdev->handle;
+ err_remove_link:
+        sysfs_remove_link(&input_class.subsys.kobj, tsdev->name);
+ err_cdev_destroy:
+        class_device_destroy(&input_class, devt);
+ err_free_tsdev:
+        tsdev_table[minor] = NULL;
+        kfree(tsdev);
+        return error;
 }
 
 static void tsdev_disconnect(struct input_handle *handle)
 {
         struct tsdev *tsdev = handle->private;
-        struct tsdev_list *list;
+        struct tsdev_client *client;
+
+        input_unregister_handle(handle);
 
         sysfs_remove_link(&input_class.subsys.kobj, tsdev->name);
         class_device_destroy(&input_class,
@@ -439,8 +478,8 @@ static void tsdev_disconnect(struct input_handle *handle)
         if (tsdev->open) {
                 input_close_device(handle);
                 wake_up_interruptible(&tsdev->wait);
-                list_for_each_entry(list, &tsdev->list, node)
-                        kill_fasync(&list->fasync, SIGIO, POLL_HUP);
+                list_for_each_entry(client, &tsdev->client_list, node)
+                        kill_fasync(&client->fasync, SIGIO, POLL_HUP);
         } else
                 tsdev_free(tsdev);
 }