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Date: Tue, 25 Sep 2012 10:55:34 +0200
From: David Herrmann <dh.herrmann@...glemail.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
Bernie Thompson <bernie@...gable.com>
Subject: Re: [PATCH v2 0/3] input: Dynamic Minor Numbers
Hi Dmitry
On Fri, Sep 21, 2012 at 10:07 AM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
[snip] See my previous review
> diff --git a/drivers/input/joydev.c b/drivers/input/joydev.c
> index f0909ed..c82f76f 100644
> --- a/drivers/input/joydev.c
> +++ b/drivers/input/joydev.c
> @@ -27,6 +27,7 @@
> #include <linux/poll.h>
> #include <linux/init.h>
> #include <linux/device.h>
> +#include <linux/cdev.h>
>
> MODULE_AUTHOR("Vojtech Pavlik <vojtech@....cz>");
> MODULE_DESCRIPTION("Joystick device interfaces");
> @@ -39,13 +40,13 @@ MODULE_LICENSE("GPL");
>
> struct joydev {
> int open;
> - int minor;
> struct input_handle handle;
> wait_queue_head_t wait;
> struct list_head client_list;
> spinlock_t client_lock; /* protects client_list */
> struct mutex mutex;
> struct device dev;
> + struct cdev cdev;
> bool exist;
>
> struct js_corr corr[ABS_CNT];
> @@ -70,9 +71,6 @@ struct joydev_client {
> struct list_head node;
> };
>
> -static struct joydev *joydev_table[JOYDEV_MINORS];
> -static DEFINE_MUTEX(joydev_table_mutex);
> -
> static int joydev_correct(int value, struct js_corr *corr)
> {
> switch (corr->type) {
> @@ -252,30 +250,14 @@ static int joydev_release(struct inode *inode, struct file *file)
>
> static int joydev_open(struct inode *inode, struct file *file)
> {
> + struct joydev *joydev =
> + container_of(inode->i_cdev, struct joydev, cdev);
> struct joydev_client *client;
> - struct joydev *joydev;
> - int i = iminor(inode) - JOYDEV_MINOR_BASE;
> int error;
>
> - if (i >= JOYDEV_MINORS)
> - return -ENODEV;
> -
> - error = mutex_lock_interruptible(&joydev_table_mutex);
> - if (error)
> - return error;
> - joydev = joydev_table[i];
> - if (joydev)
> - get_device(&joydev->dev);
> - mutex_unlock(&joydev_table_mutex);
> -
> - if (!joydev)
> - return -ENODEV;
> -
> client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
> - if (!client) {
> - error = -ENOMEM;
> - goto err_put_joydev;
> - }
> + if (!client)
> + return -ENOMEM;
>
> spin_lock_init(&client->buffer_lock);
> client->joydev = joydev;
> @@ -288,13 +270,12 @@ static int joydev_open(struct inode *inode, struct file *file)
> file->private_data = client;
> nonseekable_open(inode, file);
>
> + get_device(&joydev->dev);
> return 0;
>
> err_free_client:
> joydev_detach_client(joydev, client);
> kfree(client);
> - err_put_joydev:
> - put_device(&joydev->dev);
> return error;
> }
>
> @@ -747,19 +728,6 @@ static const struct file_operations joydev_fops = {
> .llseek = no_llseek,
> };
>
> -static int joydev_install_chrdev(struct joydev *joydev)
> -{
> - joydev_table[joydev->minor] = joydev;
> - return 0;
> -}
> -
> -static void joydev_remove_chrdev(struct joydev *joydev)
> -{
> - mutex_lock(&joydev_table_mutex);
> - joydev_table[joydev->minor] = NULL;
> - mutex_unlock(&joydev_table_mutex);
> -}
> -
> /*
> * Mark device non-existent. This disables writes, ioctls and
> * prevents new users from opening the device. Already posted
> @@ -778,7 +746,8 @@ static void joydev_cleanup(struct joydev *joydev)
>
> joydev_mark_dead(joydev);
> joydev_hangup(joydev);
> - joydev_remove_chrdev(joydev);
> +
> + cdev_del(&joydev->cdev);
>
> /* joydev is marked dead so no one else accesses joydev->open */
> if (joydev->open)
> @@ -803,30 +772,33 @@ static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
> const struct input_device_id *id)
> {
> struct joydev *joydev;
> - int i, j, t, minor;
> + int i, j, t, minor, dev_no;
> int error;
>
> - for (minor = 0; minor < JOYDEV_MINORS; minor++)
> - if (!joydev_table[minor])
> - break;
> -
> - if (minor == JOYDEV_MINORS) {
> - pr_err("no more free joydev devices\n");
> - return -ENFILE;
> + minor = input_get_new_minor(JOYDEV_MINOR_BASE, JOYDEV_MINORS, true);
> + if (minor < 0) {
> + error = minor;
> + pr_err("failed to reserve new minor: %d\n", error);
> + return error;
How about:
return minor;
and avoid the "error = minor;" line?
> }
>
> joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
> - if (!joydev)
> - return -ENOMEM;
> + if (!joydev) {
> + error = -ENOMEM;
> + goto err_free_minor;
> + }
>
> INIT_LIST_HEAD(&joydev->client_list);
> spin_lock_init(&joydev->client_lock);
> mutex_init(&joydev->mutex);
> init_waitqueue_head(&joydev->wait);
> -
> - dev_set_name(&joydev->dev, "js%d", minor);
> joydev->exist = true;
> - joydev->minor = minor;
> +
> + dev_no = minor;
> + /* Normalize device number if it falls into legacy range */
> + if (dev_no < JOYDEV_MINOR_BASE + JOYDEV_MINORS)
> + dev_no -= JOYDEV_MINOR_BASE;
> + dev_set_name(&joydev->dev, "js%d", dev_no);
>
> joydev->handle.dev = input_get_device(dev);
> joydev->handle.name = dev_name(&joydev->dev);
> @@ -880,7 +852,7 @@ static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
> }
> }
>
> - joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
> + joydev->dev.devt = MKDEV(INPUT_MAJOR, minor);
> joydev->dev.class = &input_class;
> joydev->dev.parent = &dev->dev;
> joydev->dev.release = joydev_free;
> @@ -890,7 +862,8 @@ static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
> if (error)
> goto err_free_joydev;
>
> - error = joydev_install_chrdev(joydev);
> + cdev_init(&joydev->cdev, &joydev_fops);
> + error = cdev_add(&joydev->cdev, joydev->dev.devt, 1);
> if (error)
> goto err_unregister_handle;
>
> @@ -906,6 +879,8 @@ static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
> input_unregister_handle(&joydev->handle);
> err_free_joydev:
> put_device(&joydev->dev);
> + err_free_minor:
> + input_free_minor(minor);
> return error;
> }
>
> @@ -915,6 +890,7 @@ static void joydev_disconnect(struct input_handle *handle)
>
> device_del(&joydev->dev);
> joydev_cleanup(joydev);
> + input_free_minor(MINOR(joydev->dev.devt));
> input_unregister_handle(handle);
> put_device(&joydev->dev);
> }
> @@ -966,8 +942,6 @@ static struct input_handler joydev_handler = {
> .match = joydev_match,
> .connect = joydev_connect,
> .disconnect = joydev_disconnect,
> - .fops = &joydev_fops,
> - .minor = JOYDEV_MINOR_BASE,
> .name = "joydev",
> .id_table = joydev_ids,
> };
> diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c
> index 964e43d..7fd9d91 100644
> --- a/drivers/input/mousedev.c
> +++ b/drivers/input/mousedev.c
> @@ -24,10 +24,8 @@
> #include <linux/random.h>
> #include <linux/major.h>
> #include <linux/device.h>
> +#include <linux/cdev.h>
> #include <linux/kernel.h>
> -#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
> -#include <linux/miscdevice.h>
> -#endif
>
> MODULE_AUTHOR("Vojtech Pavlik <vojtech@....cz>");
> MODULE_DESCRIPTION("Mouse (ExplorerPS/2) device interfaces");
> @@ -61,17 +59,18 @@ struct mousedev_hw_data {
>
> struct mousedev {
> int open;
> - int minor;
> struct input_handle handle;
> wait_queue_head_t wait;
> struct list_head client_list;
> spinlock_t client_lock; /* protects client_list */
> struct mutex mutex;
> struct device dev;
> + struct cdev cdev;
> bool exist;
> + bool is_mixdev;
>
> struct list_head mixdev_node;
> - int mixdev_open;
> + bool mixdev_open;
Could you keep cleanup/codingstyle-patches separate? It makes review
so much easier. This patch is already quite long. Anyway, looks good.
>
> struct mousedev_hw_data packet;
> unsigned int pkt_count;
> @@ -114,10 +113,6 @@ struct mousedev_client {
> static unsigned char mousedev_imps_seq[] = { 0xf3, 200, 0xf3, 100, 0xf3, 80 };
> static unsigned char mousedev_imex_seq[] = { 0xf3, 200, 0xf3, 200, 0xf3, 80 };
>
> -static struct input_handler mousedev_handler;
> -
> -static struct mousedev *mousedev_table[MOUSEDEV_MINORS];
> -static DEFINE_MUTEX(mousedev_table_mutex);
> static struct mousedev *mousedev_mix;
> static LIST_HEAD(mousedev_mix_list);
>
> @@ -433,7 +428,7 @@ static int mousedev_open_device(struct mousedev *mousedev)
> if (retval)
> return retval;
>
> - if (mousedev->minor == MOUSEDEV_MIX)
> + if (mousedev->is_mixdev)
> mixdev_open_devices();
> else if (!mousedev->exist)
> retval = -ENODEV;
> @@ -451,7 +446,7 @@ static void mousedev_close_device(struct mousedev *mousedev)
> {
> mutex_lock(&mousedev->mutex);
>
> - if (mousedev->minor == MOUSEDEV_MIX)
> + if (mousedev->is_mixdev)
> mixdev_close_devices();
> else if (mousedev->exist && !--mousedev->open)
> input_close_device(&mousedev->handle);
> @@ -476,7 +471,7 @@ static void mixdev_open_devices(void)
> if (mousedev_open_device(mousedev))
> continue;
>
> - mousedev->mixdev_open = 1;
> + mousedev->mixdev_open = true;
> }
> }
> }
> @@ -495,7 +490,7 @@ static void mixdev_close_devices(void)
>
> list_for_each_entry(mousedev, &mousedev_mix_list, mixdev_node) {
> if (mousedev->mixdev_open) {
> - mousedev->mixdev_open = 0;
> + mousedev->mixdev_open = false;
> mousedev_close_device(mousedev);
> }
> }
> @@ -538,35 +533,17 @@ static int mousedev_open(struct inode *inode, struct file *file)
> struct mousedev_client *client;
> struct mousedev *mousedev;
> int error;
> - int i;
>
> #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
> if (imajor(inode) == MISC_MAJOR)
> - i = MOUSEDEV_MIX;
> + mousedev = mousedev_mix;
> else
> #endif
> - i = iminor(inode) - MOUSEDEV_MINOR_BASE;
> -
> - if (i >= MOUSEDEV_MINORS)
> - return -ENODEV;
> -
> - error = mutex_lock_interruptible(&mousedev_table_mutex);
> - if (error)
> - return error;
> -
> - mousedev = mousedev_table[i];
> - if (mousedev)
> - get_device(&mousedev->dev);
> - mutex_unlock(&mousedev_table_mutex);
> -
> - if (!mousedev)
> - return -ENODEV;
> + mousedev = container_of(inode->i_cdev, struct mousedev, cdev);
>
> client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
> - if (!client) {
> - error = -ENOMEM;
> - goto err_put_mousedev;
> - }
> + if (!client)
> + return -ENOMEM;
>
> spin_lock_init(&client->packet_lock);
> client->pos_x = xres / 2;
> @@ -579,13 +556,14 @@ static int mousedev_open(struct inode *inode, struct file *file)
> goto err_free_client;
>
> file->private_data = client;
> + nonseekable_open(inode, file);
> +
> + get_device(&mousedev->dev);
> return 0;
>
> err_free_client:
> mousedev_detach_client(mousedev, client);
> kfree(client);
> - err_put_mousedev:
> - put_device(&mousedev->dev);
> return error;
> }
>
> @@ -785,29 +763,16 @@ static unsigned int mousedev_poll(struct file *file, poll_table *wait)
> }
>
> static const struct file_operations mousedev_fops = {
> - .owner = THIS_MODULE,
> - .read = mousedev_read,
> - .write = mousedev_write,
> - .poll = mousedev_poll,
> - .open = mousedev_open,
> - .release = mousedev_release,
> - .fasync = mousedev_fasync,
> - .llseek = noop_llseek,
> + .owner = THIS_MODULE,
> + .read = mousedev_read,
> + .write = mousedev_write,
> + .poll = mousedev_poll,
> + .open = mousedev_open,
> + .release = mousedev_release,
> + .fasync = mousedev_fasync,
> + .llseek = noop_llseek,
> };
Again some cleanups.
> -static int mousedev_install_chrdev(struct mousedev *mousedev)
> -{
> - mousedev_table[mousedev->minor] = mousedev;
> - return 0;
> -}
> -
> -static void mousedev_remove_chrdev(struct mousedev *mousedev)
> -{
> - mutex_lock(&mousedev_table_mutex);
> - mousedev_table[mousedev->minor] = NULL;
> - mutex_unlock(&mousedev_table_mutex);
> -}
> -
> /*
> * Mark device non-existent. This disables writes, ioctls and
> * prevents new users from opening the device. Already posted
> @@ -842,24 +807,50 @@ static void mousedev_cleanup(struct mousedev *mousedev)
>
> mousedev_mark_dead(mousedev);
> mousedev_hangup(mousedev);
> - mousedev_remove_chrdev(mousedev);
> +
> + cdev_del(&mousedev->cdev);
>
> /* mousedev is marked dead so no one else accesses mousedev->open */
> if (mousedev->open)
> input_close_device(handle);
> }
>
> +static int mousedev_reserve_minor(bool mixdev)
> +{
> + int minor;
> +
> + if (mixdev) {
> + minor = input_get_new_minor(MOUSEDEV_MIX, 1, false);
> + if (minor < 0)
> + pr_err("failed to reserve mixdev minor: %d\n", minor);
> + } else {
> + minor = input_get_new_minor(MOUSEDEV_MINOR_BASE,
> + MOUSEDEV_MINORS, true);
> + if (minor < 0)
> + pr_err("failed to reserve new minor: %d\n", minor);
> + }
> +
> + return minor;
> +}
> +
> static struct mousedev *mousedev_create(struct input_dev *dev,
> struct input_handler *handler,
> - int minor)
> + bool mixdev)
> {
> struct mousedev *mousedev;
> + int minor;
> int error;
>
> + minor = mousedev_reserve_minor(mixdev);
> + if (minor < 0) {
> + error = minor;
> + goto err_out;
> + }
> +
> mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
> if (!mousedev) {
> error = -ENOMEM;
> - goto err_out;
> + goto err_free_minor;
> }
>
> INIT_LIST_HEAD(&mousedev->client_list);
> @@ -867,16 +858,21 @@ static struct mousedev *mousedev_create(struct input_dev *dev,
> spin_lock_init(&mousedev->client_lock);
> mutex_init(&mousedev->mutex);
> lockdep_set_subclass(&mousedev->mutex,
> - minor == MOUSEDEV_MIX ? SINGLE_DEPTH_NESTING : 0);
> + mixdev ? SINGLE_DEPTH_NESTING : 0);
> init_waitqueue_head(&mousedev->wait);
>
> - if (minor == MOUSEDEV_MIX)
> + if (mixdev) {
> dev_set_name(&mousedev->dev, "mice");
> - else
> - dev_set_name(&mousedev->dev, "mouse%d", minor);
> + } else {
> + int dev_no = minor;
> + /* Normalize device number if it falls into legacy range */
> + if (dev_no < MOUSEDEV_MINOR_BASE + MOUSEDEV_MINORS)
> + dev_no -= MOUSEDEV_MINOR_BASE;
> + dev_set_name(&mousedev->dev, "mouse%d", dev_no);
> + }
>
> - mousedev->minor = minor;
> mousedev->exist = true;
> + mousedev->is_mixdev = mixdev;
> mousedev->handle.dev = input_get_device(dev);
> mousedev->handle.name = dev_name(&mousedev->dev);
> mousedev->handle.handler = handler;
> @@ -885,17 +881,18 @@ static struct mousedev *mousedev_create(struct input_dev *dev,
> mousedev->dev.class = &input_class;
> if (dev)
> mousedev->dev.parent = &dev->dev;
> - mousedev->dev.devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor);
> + mousedev->dev.devt = MKDEV(INPUT_MAJOR, minor);
> mousedev->dev.release = mousedev_free;
> device_initialize(&mousedev->dev);
>
> - if (minor != MOUSEDEV_MIX) {
> + if (!mixdev) {
> error = input_register_handle(&mousedev->handle);
> if (error)
> goto err_free_mousedev;
> }
>
> - error = mousedev_install_chrdev(mousedev);
> + cdev_init(&mousedev->cdev, &mousedev_fops);
> + error = cdev_add(&mousedev->cdev, mousedev->dev.devt, 1);
> if (error)
> goto err_unregister_handle;
>
> @@ -908,10 +905,12 @@ static struct mousedev *mousedev_create(struct input_dev *dev,
> err_cleanup_mousedev:
> mousedev_cleanup(mousedev);
> err_unregister_handle:
> - if (minor != MOUSEDEV_MIX)
> + if (!mixdev)
> input_unregister_handle(&mousedev->handle);
> err_free_mousedev:
> put_device(&mousedev->dev);
> + err_free_minor:
> + input_free_minor(minor);
> err_out:
> return ERR_PTR(error);
> }
> @@ -920,7 +919,8 @@ static void mousedev_destroy(struct mousedev *mousedev)
> {
> device_del(&mousedev->dev);
> mousedev_cleanup(mousedev);
> - if (mousedev->minor != MOUSEDEV_MIX)
> + input_free_minor(MINOR(mousedev->dev.devt));
> + if (!mousedev->is_mixdev)
> input_unregister_handle(&mousedev->handle);
> put_device(&mousedev->dev);
> }
> @@ -938,7 +938,7 @@ static int mixdev_add_device(struct mousedev *mousedev)
> if (retval)
> goto out;
>
> - mousedev->mixdev_open = 1;
> + mousedev->mixdev_open = true;
> }
>
> get_device(&mousedev->dev);
> @@ -954,7 +954,7 @@ static void mixdev_remove_device(struct mousedev *mousedev)
> mutex_lock(&mousedev_mix->mutex);
>
> if (mousedev->mixdev_open) {
> - mousedev->mixdev_open = 0;
> + mousedev->mixdev_open = false;
> mousedev_close_device(mousedev);
> }
>
> @@ -969,19 +969,9 @@ static int mousedev_connect(struct input_handler *handler,
> const struct input_device_id *id)
> {
> struct mousedev *mousedev;
> - int minor;
> int error;
>
> - for (minor = 0; minor < MOUSEDEV_MINORS; minor++)
> - if (!mousedev_table[minor])
> - break;
> -
> - if (minor == MOUSEDEV_MINORS) {
> - pr_err("no more free mousedev devices\n");
> - return -ENFILE;
> - }
> -
> - mousedev = mousedev_create(dev, handler, minor);
> + mousedev = mousedev_create(dev, handler, false);
> if (IS_ERR(mousedev))
> return PTR_ERR(mousedev);
>
> @@ -1054,27 +1044,59 @@ static const struct input_device_id mousedev_ids[] = {
> MODULE_DEVICE_TABLE(input, mousedev_ids);
>
> static struct input_handler mousedev_handler = {
> - .event = mousedev_event,
> - .connect = mousedev_connect,
> - .disconnect = mousedev_disconnect,
> - .fops = &mousedev_fops,
> - .minor = MOUSEDEV_MINOR_BASE,
> - .name = "mousedev",
> - .id_table = mousedev_ids,
> + .event = mousedev_event,
> + .connect = mousedev_connect,
> + .disconnect = mousedev_disconnect,
> + .name = "mousedev",
> + .id_table = mousedev_ids,
> };
>
> #ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
> +#include <linux/miscdevice.h>
> +
> static struct miscdevice psaux_mouse = {
> - PSMOUSE_MINOR, "psaux", &mousedev_fops
> + .minor = PSMOUSE_MINOR,
> + .name = "psaux",
> + .fops = &mousedev_fops,
> };
> -static int psaux_registered;
> +static bool psaux_registered;
> +
> +static void __init mousedev_psaux_register(void)
> +{
> + int error;
> +
> + error = misc_register(&psaux_mouse);
> + if (error)
> + pr_warn("could not register psaux device, error: %d\n",
> + error);
> + else
> + psaux_registered = true;
> +
Why that newline here?
> +}
> +
> +static void __exit mousedev_psaux_unregister(void)
> +{
> + if (psaux_registered)
> + misc_deregister(&psaux_mouse);
> +}
> +
> +#else
> +
> +static inline void mousedev_psaux_register(void)
> +{
> +}
> +
> +static inline void mousedev_psaux_unregister(void)
> +{
> +}
> +
> #endif
>
> static int __init mousedev_init(void)
> {
> int error;
>
> - mousedev_mix = mousedev_create(NULL, &mousedev_handler, MOUSEDEV_MIX);
> + mousedev_mix = mousedev_create(NULL, &mousedev_handler, true);
> if (IS_ERR(mousedev_mix))
> return PTR_ERR(mousedev_mix);
>
> @@ -1084,14 +1106,7 @@ static int __init mousedev_init(void)
> return error;
> }
>
> -#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
> - error = misc_register(&psaux_mouse);
> - if (error)
> - pr_warn("could not register psaux device, error: %d\n",
> - error);
> - else
> - psaux_registered = 1;
> -#endif
> + mousedev_psaux_register();
>
> pr_info("PS/2 mouse device common for all mice\n");
>
> @@ -1100,10 +1115,7 @@ static int __init mousedev_init(void)
>
> static void __exit mousedev_exit(void)
> {
> -#ifdef CONFIG_INPUT_MOUSEDEV_PSAUX
> - if (psaux_registered)
> - misc_deregister(&psaux_mouse);
> -#endif
> + mousedev_psaux_unregister();
> input_unregister_handler(&mousedev_handler);
> mousedev_destroy(mousedev_mix);
> }
> diff --git a/include/linux/input.h b/include/linux/input.h
> index 725dcd0..c698e7e 100644
> --- a/include/linux/input.h
> +++ b/include/linux/input.h
> @@ -1387,9 +1387,6 @@ struct input_handle;
> * @start: starts handler for given handle. This function is called by
> * input core right after connect() method and also when a process
> * that "grabbed" a device releases it
> - * @fops: file operations this driver implements
> - * @minor: beginning of range of 32 minors for devices this driver
> - * can provide
> * @name: name of the handler, to be shown in /proc/bus/input/handlers
> * @id_table: pointer to a table of input_device_ids this driver can
> * handle
> @@ -1420,8 +1417,6 @@ struct input_handler {
> void (*disconnect)(struct input_handle *handle);
> void (*start)(struct input_handle *handle);
>
> - const struct file_operations *fops;
> - int minor;
> const char *name;
>
> const struct input_device_id *id_table;
> @@ -1488,6 +1483,10 @@ void input_reset_device(struct input_dev *);
> int __must_check input_register_handler(struct input_handler *);
> void input_unregister_handler(struct input_handler *);
>
> +int __must_check input_get_new_minor(int legacy_base, unsigned int legacy_num,
> + bool allow_dynamic);
> +void input_free_minor(unsigned int minor);
> +
> int input_handler_for_each_handle(struct input_handler *, void *data,
> int (*fn)(struct input_handle *, void *));
>
Looks all good and works perfectly well for me.
Reviewed-by: David Herrmann <dh.herrmann@...glemail.com>
Dmitry, if you push it into linux-next soon, we might even get it into
3.7. And while looking over it, I noticed that it really isn't that
much of a functional change. We basically just move the cdev
allocation from the core into each handler so we didn't introduce any
new races/deadlocks. At least I didn't find one.
Thanks again!
David
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