layers:Update descriptor state earlier

This change arises from an issue reported by Alon at Samsung. He
reports that a driver bug is modifying the descriptor set state on
UpdateDescriptorSets() call, so the data is getting corrupted in
validation. Since UpdateDescriptorSets() is a void function, it
doesn't make a difference in validation if we update state before or
after the call, since the call itself won't change the state being
updated. It actually saves us a lock call to update pre-call.

1 files changed, 7 insertions, 8 deletions

diff --git a/layers/core_validation.cpp b/layers/core_validation.cpp
index 19c68420..57f9d4ef 100644
--- a/layers/core_validation.cpp
+++ b/layers/core_validation.cpp
@@ -4869,9 +4869,9 @@ static bool PreCallValidateUpdateDescriptorSets(layer_data *dev_data, uint32_t d
                                                          descriptorCopyCount, pDescriptorCopies);
 }
 // PostCallRecord* handles recording state updates following call down chain to UpdateDescriptorSets()
-static void PostCallRecordUpdateDescriptorSets(layer_data *dev_data, uint32_t descriptorWriteCount,
-                                               const VkWriteDescriptorSet *pDescriptorWrites, uint32_t descriptorCopyCount,
-                                               const VkCopyDescriptorSet *pDescriptorCopies) {
+static void PreCallRecordUpdateDescriptorSets(layer_data *dev_data, uint32_t descriptorWriteCount,
+                                              const VkWriteDescriptorSet *pDescriptorWrites, uint32_t descriptorCopyCount,
+                                              const VkCopyDescriptorSet *pDescriptorCopies) {
     cvdescriptorset::PerformUpdateDescriptorSets(dev_data, descriptorWriteCount, pDescriptorWrites, descriptorCopyCount,
                                                  pDescriptorCopies);
 }
@@ -4884,14 +4884,13 @@ VKAPI_ATTR void VKAPI_CALL UpdateDescriptorSets(VkDevice device, uint32_t descri
     unique_lock_t lock(global_lock);
     bool skip = PreCallValidateUpdateDescriptorSets(dev_data, descriptorWriteCount, pDescriptorWrites, descriptorCopyCount,
                                                     pDescriptorCopies);
-    lock.unlock();
     if (!skip) {
+        // Since UpdateDescriptorSets() is void, nothing to check prior to updating state & we can update before call down chain
+        PreCallRecordUpdateDescriptorSets(dev_data, descriptorWriteCount, pDescriptorWrites, descriptorCopyCount,
+                                          pDescriptorCopies);
+        lock.unlock();
         dev_data->dispatch_table.UpdateDescriptorSets(device, descriptorWriteCount, pDescriptorWrites, descriptorCopyCount,
                                                       pDescriptorCopies);
-        lock.lock();
-        // Since UpdateDescriptorSets() is void, nothing to check prior to updating state
-        PostCallRecordUpdateDescriptorSets(dev_data, descriptorWriteCount, pDescriptorWrites, descriptorCopyCount,
-                                           pDescriptorCopies);
     }
 }