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Commit 7f0dfc16 authored by Al Viro's avatar Al Viro
Browse files

new helper: drm_ioctl_kernel() 



drm_ioctl() guts sans copying the structure to/from userland
and parsing the ioctl cmd.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 2ea659a9

drivers/gpu/drm/drm_ioctl.c

+27 −14
Original line number Diff line number Diff line
@@ -694,6 +694,32 @@ static const struct drm_ioctl_desc drm_ioctls[] = { 
 * structure.

 */



long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata,

		      u32 flags)

{

	struct drm_file *file_priv = file->private_data;

	struct drm_device *dev = file_priv->minor->dev;

	int retcode;



	if (drm_device_is_unplugged(dev))

		return -ENODEV;



	retcode = drm_ioctl_permit(flags, file_priv);

	if (unlikely(retcode))

		return retcode;



	/* Enforce sane locking for modern driver ioctls. */

	if (!drm_core_check_feature(dev, DRIVER_LEGACY) ||

	    (flags & DRM_UNLOCKED))

		retcode = func(dev, kdata, file_priv);

	else {

		mutex_lock(&drm_global_mutex);

		retcode = func(dev, kdata, file_priv);

		mutex_unlock(&drm_global_mutex);

	}

	return retcode;

}



/**

 * drm_ioctl - ioctl callback implementation for DRM drivers

 * @filp: file this ioctl is called on
@@ -762,10 +788,6 @@ long drm_ioctl(struct file *filp, 
		goto err_i1;

	}



	retcode = drm_ioctl_permit(ioctl->flags, file_priv);

	if (unlikely(retcode))

		goto err_i1;



	if (ksize <= sizeof(stack_kdata)) {

		kdata = stack_kdata;

	} else {
@@ -784,16 +806,7 @@ long drm_ioctl(struct file *filp, 
	if (ksize > in_size)

		memset(kdata + in_size, 0, ksize - in_size);



	/* Enforce sane locking for modern driver ioctls. */

	if (!drm_core_check_feature(dev, DRIVER_LEGACY) ||

	    (ioctl->flags & DRM_UNLOCKED))

		retcode = func(dev, kdata, file_priv);

	else {

		mutex_lock(&drm_global_mutex);

		retcode = func(dev, kdata, file_priv);

		mutex_unlock(&drm_global_mutex);

	}



	retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags);

	if (copy_to_user((void __user *)arg, kdata, out_size) != 0)

		retcode = -EFAULT;

include/drm/drm_ioctl.h

+1 −0
Original line number Diff line number Diff line
@@ -172,6 +172,7 @@ struct drm_ioctl_desc { 


int drm_ioctl_permit(u32 flags, struct drm_file *file_priv);

long drm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);

long drm_ioctl_kernel(struct file *, drm_ioctl_t, void *, u32);

#ifdef CONFIG_COMPAT

long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);

#else