Ozone GBM: i915_gem_end_cpu_access causes crash.

ui/ozone/platform/drm/common/client_native_pixmap_dmabuf.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/drm/common/client_native_pixmap_dmabuf.h"
 
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/mman.h>
 #include <xf86drm.h>
@@ skipping 22 matching lines @@
 #endif
 
 namespace ui {
 
 namespace {
 
 void PrimeSyncStart(int dmabuf_fd) {
   struct local_dma_buf_sync sync_start = {0};
 
   sync_start.flags = LOCAL_DMA_BUF_SYNC_START | LOCAL_DMA_BUF_SYNC_READ;
-  if (drmIoctl(dmabuf_fd, LOCAL_DMA_BUF_IOCTL_SYNC, &sync_start))
+  // TODO(tiago.vignatti): fix the crash bug. crbug.com/605774
+  if (false && drmIoctl(dmabuf_fd, LOCAL_DMA_BUF_IOCTL_SYNC, &sync_start))
     PLOG(ERROR) << "Failed DMA_BUF_SYNC_START";
 }
 
 void PrimeSyncEnd(int dmabuf_fd) {
   struct local_dma_buf_sync sync_end = {0};
 
   sync_end.flags = LOCAL_DMA_BUF_SYNC_END | LOCAL_DMA_BUF_SYNC_WRITE;
-  if (drmIoctl(dmabuf_fd, LOCAL_DMA_BUF_IOCTL_SYNC, &sync_end))
+  if (false && drmIoctl(dmabuf_fd, LOCAL_DMA_BUF_IOCTL_SYNC, &sync_end))
     PLOG(ERROR) << "Failed DMA_BUF_SYNC_END";
 }
 
 }  // namespace
 
 // static
 std::unique_ptr<ClientNativePixmap> ClientNativePixmapDmaBuf::ImportFromDmabuf(
     int dmabuf_fd,
     const gfx::Size& size,
     int stride) {
@@ skipping 29 matching lines @@
 void ClientNativePixmapDmaBuf::Unmap() {
   TRACE_EVENT0("drm", "DmaBuf:Unmap");
   PrimeSyncEnd(dmabuf_fd_.get());
 }
 
 void ClientNativePixmapDmaBuf::GetStride(int* stride) const {
   *stride = stride_;
 }
 
 }  // namespace ui