new helper: drm_ioctl_kernel()
drm_ioctl() guts sans copying the structure to/from userland
and parsing the ioctl cmd.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 865e3ee..1ead19c 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -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;