Remove unneeded pipeline barrier in vulkan

src/gpu/vk/GrVkGpu.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrVkGpu.h"
 
 #include "GrContextOptions.h"
@@ skipping 1135 matching lines @@
 
             VK_CALL(CmdPipelineBarrier(cmdBuffer,
                                        GrVkMemory::LayoutToPipelineStageFlags(initialLayout),
                                        VK_PIPELINE_STAGE_TRANSFER_BIT,
                                        0,
                                        0, nullptr,
                                        0, nullptr,
                                        1, &barrier));
             initialLayout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
 
-            // Make sure buffer has finished the unmap
-            VkBufferMemoryBarrier bufBarrier;
-            memset(&barrier, 0, sizeof(VkImageMemoryBarrier));
-            bufBarrier.sType = VK_STRUCTURE_TYPE_BUFFER_MEMORY_BARRIER;
-            bufBarrier.pNext = nullptr;
-            bufBarrier.srcAccessMask = VK_ACCESS_HOST_WRITE_BIT;
-            bufBarrier.dstAccessMask = VK_ACCESS_TRANSFER_READ_BIT;
-            bufBarrier.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
-            bufBarrier.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
-            bufBarrier.buffer = buffer;
-            bufBarrier.offset = 0;
-            bufBarrier.size = bufInfo.size;
-
-            VK_CALL(CmdPipelineBarrier(cmdBuffer,
-                                       VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
-                                       VK_PIPELINE_STAGE_TRANSFER_BIT,
-                                       0,
-                                       0, nullptr,
-                                       1, &bufBarrier,
-                                       0, nullptr));
-
             // Submit copy command
             VkBufferImageCopy region;
             memset(&region, 0, sizeof(VkBufferImageCopy));
             region.bufferOffset = 0;
             region.bufferRowLength = w;
             region.bufferImageHeight = h;
             region.imageSubresource = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 0, 1 };
             region.imageOffset = { 0, 0, 0 };
             region.imageExtent = { (uint32_t)w, (uint32_t)h, 1 };
 
@@ skipping 609 matching lines @@
     // Currently it is fine for us to always pass in 1 for the clear count even if no attachment
     // uses it. In the current state, we also only use the LOAD_OP_CLEAR for the color attachment
     // which is always at the first attachment.
     fCurrentCmdBuffer->beginRenderPass(this, renderPass, 1, colorClear, *target, *pBounds, true);
     fCurrentCmdBuffer->executeCommands(this, buffer);
     fCurrentCmdBuffer->endRenderPass(this);
 
     this->didWriteToSurface(target, &bounds);
 }