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 (file)
--- 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;
 

diff --git a/include/drm/drm_ioctl.h b/include/drm/drm_ioctl.h
index ee03b3c..add4280 100644 (file)
--- a/include/drm/drm_ioctl.h
+++ b/include/drm/drm_ioctl.h
@@ -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