From 86680e0cc8ae657ab625fe4abc6be4efadb90f1a Mon Sep 17 00:00:00 2001
From: Julian Orth <ju.orth@gmail.com>
Date: Wed, 1 Oct 2025 23:37:04 +0200
Subject: [PATCH] dmabuf: optimize sync-file export/import

---
 src/gfx_apis/vulkan/renderer.rs | 3 +++
 src/video/dmabuf.rs             | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/src/gfx_apis/vulkan/renderer.rs b/src/gfx_apis/vulkan/renderer.rs
index ea3bfdd9..cd0cf29d 100644
--- a/src/gfx_apis/vulkan/renderer.rs
+++ b/src/gfx_apis/vulkan/renderer.rs
@@ -1649,6 +1649,9 @@ impl VulkanRenderer {
                             let fd = dma_buf_export_sync_file(&plane.fd, flag)
                                 .map_err(VulkanError::IoctlExportSyncFile)?;
                             import_sync_file(fd)?;
+                            if buf.template.dmabuf.is_one_file() {
+                                break;
+                            }
                         }
                     }
                     AcquireSync::SyncFile { sync_file } => {
diff --git a/src/video/dmabuf.rs b/src/video/dmabuf.rs
index 1e6482ee..e19def66 100644
--- a/src/video/dmabuf.rs
+++ b/src/video/dmabuf.rs
@@ -60,6 +60,10 @@ impl DmaBuf {
         })
     }
 
+    pub fn is_one_file(&self) -> bool {
+        !self.is_disjoint()
+    }
+
     pub fn udmabuf_size(&self) -> Option<usize> {
         if self.planes.len() != 1 {
             return None;
@@ -103,6 +107,9 @@ impl DmaBuf {
     pub fn import_sync_file(&self, flags: u32, sync_file: &OwnedFd) -> Result<(), OsError> {
         for plane in &self.planes {
             dma_buf_import_sync_file(&plane.fd, flags, sync_file)?;
+            if self.is_one_file() {
+                break;
+            }
         }
         Ok(())
     }