diff --git a/src/dawn_native/PassResourceUsageTracker.cpp b/src/dawn_native/PassResourceUsageTracker.cpp
index 1f9c350..dd1c022 100644
--- a/src/dawn_native/PassResourceUsageTracker.cpp
+++ b/src/dawn_native/PassResourceUsageTracker.cpp
@@ -44,15 +44,15 @@
         textureUsage.usage |= usage;
 
         // Set usages for subresources
-        uint32_t subresourceCount =
-            texture->GetSubresourceIndex(texture->GetNumMipLevels(), texture->GetArrayLayers());
+        uint32_t subresourceCount = texture->GetSubresourceCount();
         if (!textureUsage.subresourceUsages.size()) {
             textureUsage.subresourceUsages =
                 std::vector<wgpu::TextureUsage>(subresourceCount, wgpu::TextureUsage::None);
         }
-        for (uint32_t mipLevel = baseMipLevel; mipLevel < baseMipLevel + levelCount; ++mipLevel) {
-            for (uint32_t arrayLayer = baseArrayLayer; arrayLayer < baseArrayLayer + layerCount;
-                 ++arrayLayer) {
+        for (uint32_t arrayLayer = baseArrayLayer; arrayLayer < baseArrayLayer + layerCount;
+             ++arrayLayer) {
+            for (uint32_t mipLevel = baseMipLevel; mipLevel < baseMipLevel + levelCount;
+                 ++mipLevel) {
                 uint32_t subresourceIndex = texture->GetSubresourceIndex(mipLevel, arrayLayer);
                 textureUsage.subresourceUsages[subresourceIndex] |= usage;
             }
@@ -64,8 +64,7 @@
         PassTextureUsage& passTextureUsage = mTextureUsages[texture];
         passTextureUsage.usage |= textureUsage.usage;
 
-        uint32_t subresourceCount =
-            texture->GetSubresourceIndex(texture->GetNumMipLevels(), texture->GetArrayLayers());
+        uint32_t subresourceCount = texture->GetSubresourceCount();
         ASSERT(textureUsage.subresourceUsages.size() == subresourceCount);
         if (!passTextureUsage.subresourceUsages.size()) {
             passTextureUsage.subresourceUsages = textureUsage.subresourceUsages;
diff --git a/src/dawn_native/Texture.cpp b/src/dawn_native/Texture.cpp
index 1861c0c..bc33ec7 100644
--- a/src/dawn_native/Texture.cpp
+++ b/src/dawn_native/Texture.cpp
@@ -351,8 +351,7 @@
           mSampleCount(descriptor->sampleCount),
           mUsage(descriptor->usage),
           mState(state) {
-        uint32_t subresourceCount =
-            GetSubresourceIndex(descriptor->mipLevelCount, descriptor->arrayLayerCount);
+        uint32_t subresourceCount = GetSubresourceCount();
         mIsSubresourceContentInitializedAtIndex = std::vector<bool>(subresourceCount, false);
 
         // Add readonly storage usage if the texture has a storage usage. The validation rules in
@@ -399,6 +398,10 @@
         ASSERT(!IsError());
         return mSampleCount;
     }
+    uint32_t TextureBase::GetSubresourceCount() const {
+        ASSERT(!IsError());
+        return mMipLevelCount * mArrayLayerCount;
+    }
     wgpu::TextureUsage TextureBase::GetUsage() const {
         ASSERT(!IsError());
         return mUsage;
@@ -423,9 +426,10 @@
                                                       uint32_t baseArrayLayer,
                                                       uint32_t layerCount) const {
         ASSERT(!IsError());
-        for (uint32_t mipLevel = baseMipLevel; mipLevel < baseMipLevel + levelCount; ++mipLevel) {
-            for (uint32_t arrayLayer = baseArrayLayer; arrayLayer < baseArrayLayer + layerCount;
-                 ++arrayLayer) {
+        for (uint32_t arrayLayer = baseArrayLayer; arrayLayer < baseArrayLayer + layerCount;
+             ++arrayLayer) {
+            for (uint32_t mipLevel = baseMipLevel; mipLevel < baseMipLevel + levelCount;
+                 ++mipLevel) {
                 uint32_t subresourceIndex = GetSubresourceIndex(mipLevel, arrayLayer);
                 ASSERT(subresourceIndex < mIsSubresourceContentInitializedAtIndex.size());
                 if (!mIsSubresourceContentInitializedAtIndex[subresourceIndex]) {
@@ -442,9 +446,10 @@
                                                          uint32_t baseArrayLayer,
                                                          uint32_t layerCount) {
         ASSERT(!IsError());
-        for (uint32_t mipLevel = baseMipLevel; mipLevel < baseMipLevel + levelCount; ++mipLevel) {
-            for (uint32_t arrayLayer = baseArrayLayer; arrayLayer < baseArrayLayer + layerCount;
-                 ++arrayLayer) {
+        for (uint32_t arrayLayer = baseArrayLayer; arrayLayer < baseArrayLayer + layerCount;
+             ++arrayLayer) {
+            for (uint32_t mipLevel = baseMipLevel; mipLevel < baseMipLevel + levelCount;
+                 ++mipLevel) {
                 uint32_t subresourceIndex = GetSubresourceIndex(mipLevel, arrayLayer);
                 ASSERT(subresourceIndex < mIsSubresourceContentInitializedAtIndex.size());
                 mIsSubresourceContentInitializedAtIndex[subresourceIndex] = isInitialized;
diff --git a/src/dawn_native/Texture.h b/src/dawn_native/Texture.h
index d14696c..7211839 100644
--- a/src/dawn_native/Texture.h
+++ b/src/dawn_native/Texture.h
@@ -55,6 +55,7 @@
         uint32_t GetArrayLayers() const;
         uint32_t GetNumMipLevels() const;
         uint32_t GetSampleCount() const;
+        uint32_t GetSubresourceCount() const;
         wgpu::TextureUsage GetUsage() const;
         TextureState GetTextureState() const;
         uint32_t GetSubresourceIndex(uint32_t mipLevel, uint32_t arraySlice) const;