Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1255269 > unrolled thread

Re: [PATCH v3] Input: uinput - add new UINPUT_DEV_SETUP and UI_ABS_SETUP ioctl

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: [PATCH v3] Input: uinput - add new UINPUT_DEV_SETUP and  UI_ABS_SETUP ioctl Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2015-10-25 04:10 +0100
    Re: [PATCH v3] Input: uinput - add new UINPUT_DEV_SETUP and  UI_ABS_SETUP ioctl David Herrmann <dh.herrmann@gmail.com> - 2015-10-25 10:40 +0100
      Re: [PATCH v3] Input: uinput - add new UINPUT_DEV_SETUP and  UI_ABS_SETUP ioctl Benjamin Tissoires <benjamin.tissoires@redhat.com> - 2015-10-28 16:20 +0100

#1255269 — Re: [PATCH v3] Input: uinput - add new UINPUT_DEV_SETUP and UI_ABS_SETUP ioctl

Hi Benjamin,

On Tue, Aug 25, 2015 at 11:12:59AM -0400, Benjamin Tissoires wrote:
> +static int uinput_abs_setup(struct uinput_device *udev,
> +			    struct uinput_setup __user *arg, size_t size)
> +{
> +	struct uinput_abs_setup setup = {};
> +	struct input_dev *dev;
> +
> +	if (size > sizeof(setup))
> +		return -E2BIG;
> +	if (udev->state == UIST_CREATED)
> +		return -EINVAL;
> +	if (copy_from_user(&setup, arg, size))
> +		return -EFAULT;
> +	if (setup.code > ABS_MAX)
> +		return -ERANGE;
> +
> +	dev = udev->dev;
> +
> +	input_alloc_absinfo(dev);
> +	if (!dev->absinfo)
> +		return -ENOMEM;
> +
> +	set_bit(setup.code, dev->absbit);
> +	dev->absinfo[setup.code] = setup.absinfo;
> +
> +	/*
> +	 * We restore the state to UIST_NEW_DEVICE because the user has to call
> +	 * UI_DEV_SETUP in the last place before UI_DEV_CREATE to check the
> +	 * validity of the absbits.
> +	 */

Do we have to be this strict? It seems to me that with the new IOCTLs
you naturally want to use the new ioctl to setup the device, then adjust
various axes and bits and then validate everything.

Thanks.

-- 
Dmitry
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [next] | [standalone]

#1255327

[Multipart message — attachments visible in raw view] — view raw

Hi

On Sun, Oct 25, 2015 at 12:53 AM, Dmitry Torokhov
<dmitry.torokhov@gmail.com> wrote:
> Hi Benjamin,
>
> On Tue, Aug 25, 2015 at 11:12:59AM -0400, Benjamin Tissoires wrote:
>> +static int uinput_abs_setup(struct uinput_device *udev,
>> +                         struct uinput_setup __user *arg, size_t size)
>> +{
>> +     struct uinput_abs_setup setup = {};
>> +     struct input_dev *dev;
>> +
>> +     if (size > sizeof(setup))
>> +             return -E2BIG;
>> +     if (udev->state == UIST_CREATED)
>> +             return -EINVAL;
>> +     if (copy_from_user(&setup, arg, size))
>> +             return -EFAULT;
>> +     if (setup.code > ABS_MAX)
>> +             return -ERANGE;
>> +
>> +     dev = udev->dev;
>> +
>> +     input_alloc_absinfo(dev);
>> +     if (!dev->absinfo)
>> +             return -ENOMEM;
>> +
>> +     set_bit(setup.code, dev->absbit);
>> +     dev->absinfo[setup.code] = setup.absinfo;
>> +
>> +     /*
>> +      * We restore the state to UIST_NEW_DEVICE because the user has to call
>> +      * UI_DEV_SETUP in the last place before UI_DEV_CREATE to check the
>> +      * validity of the absbits.
>> +      */
>
> Do we have to be this strict? It seems to me that with the new IOCTLs
> you naturally want to use the new ioctl to setup the device, then adjust
> various axes and bits and then validate everything.

Indeed, we now force the order to be abs-setup first, then
device-setup as last step. Appended is a follow-up patch to cleanup
ABS handling in uinput. It is untested. Benjamin, care to give it a
spin?

Thanks
David

----
From 2568f83bcc5c4b8aeb149be2c5fc5a743812f0fe Mon Sep 17 00:00:00 2001
From: David Herrmann <dh.herrmann@gmail.com>
Date: Sun, 25 Oct 2015 10:34:13 +0100
Subject: [PATCH] Input: uinput - rework ABS validation

Rework the uinput ABS validation to check passed absinfo data
immediately, but do ABS initialization as last step in UI_DEV_CREATE. The
behavior observed by user-space is not changed, as ABS initialization was
never checked for errors.

With this in place, the order of device-initialization and
abs-configuration is no longer fixed. User-space can initialize the
device and afterwards set absinfo just fine.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
---
 drivers/input/misc/uinput.c | 89 +++++++++++++++++++++++----------------------
 1 file changed, 45 insertions(+), 44 deletions(-)

diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index baac903..1d93037 100644
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -256,13 +256,22 @@ static void uinput_destroy_device(...)
 static int uinput_create_device(struct uinput_device *udev)
 {
  struct input_dev *dev = udev->dev;
- int error;
+ int error, nslot;

  if (udev->state != UIST_SETUP_COMPLETE) {
  printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
  return -EINVAL;
  }

+ if (test_bit(ABS_MT_SLOT, dev->absbit)) {
+ nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
+ error = input_mt_init_slots(dev, nslot, 0);
+ if (error)
+ goto fail1;
+ } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
+ input_set_events_per_packet(dev, 60);
+ }
+
  if (udev->ff_effects_max) {
  error = input_ff_create(dev, udev->ff_effects_max);
  if (error)
@@ -308,10 +317,35 @@ static int uinput_open(...)
  return 0;
 }

+static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
+   const struct input_absinfo *abs)
+{
+ int min, max;
+
+ min = abs->minimum;
+ max = abs->maximum;
+
+ if ((min != 0 || max != 0) && max <= min) {
+ printk(KERN_DEBUG
+       "%s: invalid abs[%02x] min:%d max:%d\n",
+       UINPUT_NAME, code, min, max);
+ return -EINVAL;
+ }
+
+ if (abs->flat > max - min) {
+ printk(KERN_DEBUG
+       "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
+       UINPUT_NAME, code, abs->flat, min, max);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
 static int uinput_validate_absbits(struct input_dev *dev)
 {
  unsigned int cnt;
- int nslot;
+ int error;

  if (!test_bit(EV_ABS, dev->evbit))
  return 0;
@@ -321,38 +355,12 @@ static int uinput_validate_absbits(struct input_dev *dev)
  */

  for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
- int min, max;
-
- min = input_abs_get_min(dev, cnt);
- max = input_abs_get_max(dev, cnt);
-
- if ((min != 0 || max != 0) && max <= min) {
- printk(KERN_DEBUG
- "%s: invalid abs[%02x] min:%d max:%d\n",
- UINPUT_NAME, cnt,
- input_abs_get_min(dev, cnt),
- input_abs_get_max(dev, cnt));
+ if (!dev->absinfo)
  return -EINVAL;
- }
-
- if (input_abs_get_flat(dev, cnt) >
-    input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
- printk(KERN_DEBUG
- "%s: abs_flat #%02x out of range: %d "
- "(min:%d/max:%d)\n",
- UINPUT_NAME, cnt,
- input_abs_get_flat(dev, cnt),
- input_abs_get_min(dev, cnt),
- input_abs_get_max(dev, cnt));
- return -EINVAL;
- }
- }

- if (test_bit(ABS_MT_SLOT, dev->absbit)) {
- nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
- input_mt_init_slots(dev, nslot, 0);
- } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
- input_set_events_per_packet(dev, 60);
+ error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]);
+ if (error)
+ return error;
  }

  return 0;
@@ -375,7 +383,6 @@ static int uinput_dev_setup(struct uinput_device *udev,
 {
  struct uinput_setup setup;
  struct input_dev *dev;
- int retval;

  if (udev->state == UIST_CREATED)
  return -EINVAL;
@@ -393,10 +400,6 @@ static int uinput_dev_setup(struct uinput_device *udev,
  if (!dev->name)
  return -ENOMEM;

- retval = uinput_validate_absbits(dev);
- if (retval < 0)
- return retval;
-
  udev->state = UIST_SETUP_COMPLETE;
  return 0;
 }
@@ -406,6 +409,7 @@ static int uinput_abs_setup(struct uinput_device *udev,
 {
  struct uinput_abs_setup setup = {};
  struct input_dev *dev;
+ int error;

  if (size > sizeof(setup))
  return -E2BIG;
@@ -418,19 +422,16 @@ static int uinput_abs_setup(struct uinput_device *udev,

  dev = udev->dev;

+ error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo);
+ if (error)
+ return error;
+
  input_alloc_absinfo(dev);
  if (!dev->absinfo)
  return -ENOMEM;

  set_bit(setup.code, dev->absbit);
  dev->absinfo[setup.code] = setup.absinfo;
-
- /*
- * We restore the state to UIST_NEW_DEVICE because the user has to call
- * UI_DEV_SETUP in the last place before UI_DEV_CREATE to check the
- * validity of the absbits.
- */
- udev->state = UIST_NEW_DEVICE;
  return 0;
 }

-- 
2.6.1

[toc] | [prev] | [next] | [standalone]

#1258238

Hi,

On Oct 25 2015 or thereabouts, David Herrmann wrote:
> Hi
> 
> On Sun, Oct 25, 2015 at 12:53 AM, Dmitry Torokhov
> <dmitry.torokhov@gmail.com> wrote:
> > Hi Benjamin,
> >
> > On Tue, Aug 25, 2015 at 11:12:59AM -0400, Benjamin Tissoires wrote:
> >> +static int uinput_abs_setup(struct uinput_device *udev,
> >> +                         struct uinput_setup __user *arg, size_t size)
> >> +{
> >> +     struct uinput_abs_setup setup = {};
> >> +     struct input_dev *dev;
> >> +
> >> +     if (size > sizeof(setup))
> >> +             return -E2BIG;
> >> +     if (udev->state == UIST_CREATED)
> >> +             return -EINVAL;
> >> +     if (copy_from_user(&setup, arg, size))
> >> +             return -EFAULT;
> >> +     if (setup.code > ABS_MAX)
> >> +             return -ERANGE;
> >> +
> >> +     dev = udev->dev;
> >> +
> >> +     input_alloc_absinfo(dev);
> >> +     if (!dev->absinfo)
> >> +             return -ENOMEM;
> >> +
> >> +     set_bit(setup.code, dev->absbit);
> >> +     dev->absinfo[setup.code] = setup.absinfo;
> >> +
> >> +     /*
> >> +      * We restore the state to UIST_NEW_DEVICE because the user has to call
> >> +      * UI_DEV_SETUP in the last place before UI_DEV_CREATE to check the
> >> +      * validity of the absbits.
> >> +      */
> >
> > Do we have to be this strict? It seems to me that with the new IOCTLs
> > you naturally want to use the new ioctl to setup the device, then adjust
> > various axes and bits and then validate everything.
> 
> Indeed, we now force the order to be abs-setup first, then
> device-setup as last step. Appended is a follow-up patch to cleanup
> ABS handling in uinput. It is untested. Benjamin, care to give it a
> spin?
> 

Sorry it took so long for the tests/review.

So the test part is fine. It works as expected. (Tested-by: BT
<benjamin.tissoires@redhat.com>)

For the review part, everything looks good except that now the doc for
UI_ABS_SETUP in uapi/linux/uinput.h should be changed to reflect the
fact that UI_DEV_SETUP is not a pre-requirement before calling
UI_ABS_SETUP.

With the doc change, the patch is also Reviewed-by: me.

Cheers,
Benjamin

> Thanks
> David
> 
> ----
> From 2568f83bcc5c4b8aeb149be2c5fc5a743812f0fe Mon Sep 17 00:00:00 2001
> From: David Herrmann <dh.herrmann@gmail.com>
> Date: Sun, 25 Oct 2015 10:34:13 +0100
> Subject: [PATCH] Input: uinput - rework ABS validation
> 
> Rework the uinput ABS validation to check passed absinfo data
> immediately, but do ABS initialization as last step in UI_DEV_CREATE. The
> behavior observed by user-space is not changed, as ABS initialization was
> never checked for errors.
> 
> With this in place, the order of device-initialization and
> abs-configuration is no longer fixed. User-space can initialize the
> device and afterwards set absinfo just fine.
> 
> Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
> ---
>  drivers/input/misc/uinput.c | 89 +++++++++++++++++++++++----------------------
>  1 file changed, 45 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
> index baac903..1d93037 100644
> --- a/drivers/input/misc/uinput.c
> +++ b/drivers/input/misc/uinput.c
> @@ -256,13 +256,22 @@ static void uinput_destroy_device(...)
>  static int uinput_create_device(struct uinput_device *udev)
>  {
>   struct input_dev *dev = udev->dev;
> - int error;
> + int error, nslot;
> 
>   if (udev->state != UIST_SETUP_COMPLETE) {
>   printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
>   return -EINVAL;
>   }
> 
> + if (test_bit(ABS_MT_SLOT, dev->absbit)) {
> + nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
> + error = input_mt_init_slots(dev, nslot, 0);
> + if (error)
> + goto fail1;
> + } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
> + input_set_events_per_packet(dev, 60);
> + }
> +
>   if (udev->ff_effects_max) {
>   error = input_ff_create(dev, udev->ff_effects_max);
>   if (error)
> @@ -308,10 +317,35 @@ static int uinput_open(...)
>   return 0;
>  }
> 
> +static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
> +   const struct input_absinfo *abs)
> +{
> + int min, max;
> +
> + min = abs->minimum;
> + max = abs->maximum;
> +
> + if ((min != 0 || max != 0) && max <= min) {
> + printk(KERN_DEBUG
> +       "%s: invalid abs[%02x] min:%d max:%d\n",
> +       UINPUT_NAME, code, min, max);
> + return -EINVAL;
> + }
> +
> + if (abs->flat > max - min) {
> + printk(KERN_DEBUG
> +       "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
> +       UINPUT_NAME, code, abs->flat, min, max);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
>  static int uinput_validate_absbits(struct input_dev *dev)
>  {
>   unsigned int cnt;
> - int nslot;
> + int error;
> 
>   if (!test_bit(EV_ABS, dev->evbit))
>   return 0;
> @@ -321,38 +355,12 @@ static int uinput_validate_absbits(struct input_dev *dev)
>   */
> 
>   for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
> - int min, max;
> -
> - min = input_abs_get_min(dev, cnt);
> - max = input_abs_get_max(dev, cnt);
> -
> - if ((min != 0 || max != 0) && max <= min) {
> - printk(KERN_DEBUG
> - "%s: invalid abs[%02x] min:%d max:%d\n",
> - UINPUT_NAME, cnt,
> - input_abs_get_min(dev, cnt),
> - input_abs_get_max(dev, cnt));
> + if (!dev->absinfo)
>   return -EINVAL;
> - }
> -
> - if (input_abs_get_flat(dev, cnt) >
> -    input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
> - printk(KERN_DEBUG
> - "%s: abs_flat #%02x out of range: %d "
> - "(min:%d/max:%d)\n",
> - UINPUT_NAME, cnt,
> - input_abs_get_flat(dev, cnt),
> - input_abs_get_min(dev, cnt),
> - input_abs_get_max(dev, cnt));
> - return -EINVAL;
> - }
> - }
> 
> - if (test_bit(ABS_MT_SLOT, dev->absbit)) {
> - nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
> - input_mt_init_slots(dev, nslot, 0);
> - } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
> - input_set_events_per_packet(dev, 60);
> + error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]);
> + if (error)
> + return error;
>   }
> 
>   return 0;
> @@ -375,7 +383,6 @@ static int uinput_dev_setup(struct uinput_device *udev,
>  {
>   struct uinput_setup setup;
>   struct input_dev *dev;
> - int retval;
> 
>   if (udev->state == UIST_CREATED)
>   return -EINVAL;
> @@ -393,10 +400,6 @@ static int uinput_dev_setup(struct uinput_device *udev,
>   if (!dev->name)
>   return -ENOMEM;
> 
> - retval = uinput_validate_absbits(dev);
> - if (retval < 0)
> - return retval;
> -
>   udev->state = UIST_SETUP_COMPLETE;
>   return 0;
>  }
> @@ -406,6 +409,7 @@ static int uinput_abs_setup(struct uinput_device *udev,
>  {
>   struct uinput_abs_setup setup = {};
>   struct input_dev *dev;
> + int error;
> 
>   if (size > sizeof(setup))
>   return -E2BIG;
> @@ -418,19 +422,16 @@ static int uinput_abs_setup(struct uinput_device *udev,
> 
>   dev = udev->dev;
> 
> + error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo);
> + if (error)
> + return error;
> +
>   input_alloc_absinfo(dev);
>   if (!dev->absinfo)
>   return -ENOMEM;
> 
>   set_bit(setup.code, dev->absbit);
>   dev->absinfo[setup.code] = setup.absinfo;
> -
> - /*
> - * We restore the state to UIST_NEW_DEVICE because the user has to call
> - * UI_DEV_SETUP in the last place before UI_DEV_CREATE to check the
> - * validity of the absbits.
> - */
> - udev->state = UIST_NEW_DEVICE;
>   return 0;
>  }
> 
> -- 
> 2.6.1

> From 2568f83bcc5c4b8aeb149be2c5fc5a743812f0fe Mon Sep 17 00:00:00 2001
> From: David Herrmann <dh.herrmann@gmail.com>
> Date: Sun, 25 Oct 2015 10:34:13 +0100
> Subject: [PATCH] Input: uinput - rework ABS validation
> 
> Rework the uinput ABS validation to check passed absinfo data
> immediately, but do ABS initialization as last step in UI_DEV_CREATE. The
> behavior observed by user-space is not changed, as ABS initialization was
> never checked for errors.
> 
> With this in place, the order of device-initialization and
> abs-configuration is no longer fixed. User-space can initialize the
> device and afterwards set absinfo just fine.
> 
> Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
> ---
>  drivers/input/misc/uinput.c | 89 +++++++++++++++++++++++----------------------
>  1 file changed, 45 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
> index baac903..1d93037 100644
> --- a/drivers/input/misc/uinput.c
> +++ b/drivers/input/misc/uinput.c
> @@ -256,13 +256,22 @@ static void uinput_destroy_device(...)
>  static int uinput_create_device(struct uinput_device *udev)
>  {
>  	struct input_dev *dev = udev->dev;
> -	int error;
> +	int error, nslot;
>  
>  	if (udev->state != UIST_SETUP_COMPLETE) {
>  		printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
>  		return -EINVAL;
>  	}
>  
> +	if (test_bit(ABS_MT_SLOT, dev->absbit)) {
> +		nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
> +		error = input_mt_init_slots(dev, nslot, 0);
> +		if (error)
> +			goto fail1;
> +	} else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
> +		input_set_events_per_packet(dev, 60);
> +	}
> +
>  	if (udev->ff_effects_max) {
>  		error = input_ff_create(dev, udev->ff_effects_max);
>  		if (error)
> @@ -308,10 +317,35 @@ static int uinput_open(...)
>  	return 0;
>  }
>  
> +static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
> +				   const struct input_absinfo *abs)
> +{
> +	int min, max;
> +
> +	min = abs->minimum;
> +	max = abs->maximum;
> +
> +	if ((min != 0 || max != 0) && max <= min) {
> +		printk(KERN_DEBUG
> +		       "%s: invalid abs[%02x] min:%d max:%d\n",
> +		       UINPUT_NAME, code, min, max);
> +		return -EINVAL;
> +	}
> +
> +	if (abs->flat > max - min) {
> +		printk(KERN_DEBUG
> +		       "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
> +		       UINPUT_NAME, code, abs->flat, min, max);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
>  static int uinput_validate_absbits(struct input_dev *dev)
>  {
>  	unsigned int cnt;
> -	int nslot;
> +	int error;
>  
>  	if (!test_bit(EV_ABS, dev->evbit))
>  		return 0;
> @@ -321,38 +355,12 @@ static int uinput_validate_absbits(struct input_dev *dev)
>  	 */
>  
>  	for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
> -		int min, max;
> -
> -		min = input_abs_get_min(dev, cnt);
> -		max = input_abs_get_max(dev, cnt);
> -
> -		if ((min != 0 || max != 0) && max <= min) {
> -			printk(KERN_DEBUG
> -				"%s: invalid abs[%02x] min:%d max:%d\n",
> -				UINPUT_NAME, cnt,
> -				input_abs_get_min(dev, cnt),
> -				input_abs_get_max(dev, cnt));
> +		if (!dev->absinfo)
>  			return -EINVAL;
> -		}
> -
> -		if (input_abs_get_flat(dev, cnt) >
> -		    input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
> -			printk(KERN_DEBUG
> -				"%s: abs_flat #%02x out of range: %d "
> -				"(min:%d/max:%d)\n",
> -				UINPUT_NAME, cnt,
> -				input_abs_get_flat(dev, cnt),
> -				input_abs_get_min(dev, cnt),
> -				input_abs_get_max(dev, cnt));
> -			return -EINVAL;
> -		}
> -	}
>  
> -	if (test_bit(ABS_MT_SLOT, dev->absbit)) {
> -		nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
> -		input_mt_init_slots(dev, nslot, 0);
> -	} else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
> -		input_set_events_per_packet(dev, 60);
> +		error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]);
> +		if (error)
> +			return error;
>  	}
>  
>  	return 0;
> @@ -375,7 +383,6 @@ static int uinput_dev_setup(struct uinput_device *udev,
>  {
>  	struct uinput_setup setup;
>  	struct input_dev *dev;
> -	int retval;
>  
>  	if (udev->state == UIST_CREATED)
>  		return -EINVAL;
> @@ -393,10 +400,6 @@ static int uinput_dev_setup(struct uinput_device *udev,
>  	if (!dev->name)
>  		return -ENOMEM;
>  
> -	retval = uinput_validate_absbits(dev);
> -	if (retval < 0)
> -		return retval;
> -
>  	udev->state = UIST_SETUP_COMPLETE;
>  	return 0;
>  }
> @@ -406,6 +409,7 @@ static int uinput_abs_setup(struct uinput_device *udev,
>  {
>  	struct uinput_abs_setup setup = {};
>  	struct input_dev *dev;
> +	int error;
>  
>  	if (size > sizeof(setup))
>  		return -E2BIG;
> @@ -418,19 +422,16 @@ static int uinput_abs_setup(struct uinput_device *udev,
>  
>  	dev = udev->dev;
>  
> +	error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo);
> +	if (error)
> +		return error;
> +
>  	input_alloc_absinfo(dev);
>  	if (!dev->absinfo)
>  		return -ENOMEM;
>  
>  	set_bit(setup.code, dev->absbit);
>  	dev->absinfo[setup.code] = setup.absinfo;
> -
> -	/*
> -	 * We restore the state to UIST_NEW_DEVICE because the user has to call
> -	 * UI_DEV_SETUP in the last place before UI_DEV_CREATE to check the
> -	 * validity of the absbits.
> -	 */
> -	udev->state = UIST_NEW_DEVICE;
>  	return 0;
>  }
>  
> -- 
> 2.6.1
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [prev] | [standalone]

Back to top | Article view | linux.kernel

csiph-web