drm: update VIA driver to 2.7.2

Add PCI DMA blitengine to VIA DRM
Add portability code for porting VIA to FreeBSD.
Sync via_drm.h with 3d driver

From: Thomas Hellstrom <unichrome@shipmail.org>, Eric Anholt <anholt@freebsd.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/char/drm/via_video.c b/drivers/char/drm/via_video.c
index 7fab9fbdf424..300ac61b09ed 100644
--- a/drivers/char/drm/via_video.c
+++ b/drivers/char/drm/via_video.c
@@ -50,8 +50,11 @@ void via_release_futex(drm_via_private_t * dev_priv, int context)
         unsigned int i;
         volatile int *lock;
 
+        if (!dev_priv->sarea_priv)
+                return;
+
         for (i = 0; i < VIA_NR_XVMC_LOCKS; ++i) {
-                lock = (int *)XVMCLOCKPTR(dev_priv->sarea_priv, i);
+                lock = (volatile int *)XVMCLOCKPTR(dev_priv->sarea_priv, i);
                 if ((_DRM_LOCKING_CONTEXT(*lock) == context)) {
                         if (_DRM_LOCK_IS_HELD(*lock)
                             && (*lock & _DRM_LOCK_CONT)) {
@@ -79,7 +82,7 @@ int via_decoder_futex(DRM_IOCTL_ARGS)
         if (fx.lock > VIA_NR_XVMC_LOCKS)
                 return -EFAULT;
 
-        lock = (int *)XVMCLOCKPTR(sAPriv, fx.lock);
+        lock = (volatile int *)XVMCLOCKPTR(sAPriv, fx.lock);
 
         switch (fx.func) {
         case VIA_FUTEX_WAIT: