From a51adec836ae967a827cdddffc5572ef621b69d3 Mon Sep 17 00:00:00 2001
From: Gary Wilber <Spacetech326@gmail.com>
Date: Fri, 2 Oct 2020 18:26:10 -0700
Subject: [PATCH] fix parallelism when set to 0

---
 MediaBrowser.Controller/Entities/Folder.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/MediaBrowser.Controller/Entities/Folder.cs b/MediaBrowser.Controller/Entities/Folder.cs
index 8cea8755cb..db59cdc314 100644
--- a/MediaBrowser.Controller/Entities/Folder.cs
+++ b/MediaBrowser.Controller/Entities/Folder.cs
@@ -564,6 +564,9 @@ namespace MediaBrowser.Controller.Entities
                 progress.Report(childrenProgress.Average());
             }
 
+            var fanoutConcurrency = ConfigurationManager.Configuration.LibraryScanFanoutConcurrency;
+            var parallelism = fanoutConcurrency == 0 ? Environment.ProcessorCount : fanoutConcurrency;
+
             var actionBlock = new ActionBlock<int>(
                 async i =>
                 {
@@ -588,7 +591,7 @@ namespace MediaBrowser.Controller.Entities
                 },
                 new ExecutionDataflowBlockOptions
                 {
-                    MaxDegreeOfParallelism = ConfigurationManager.Configuration.LibraryScanFanoutConcurrency,
+                    MaxDegreeOfParallelism = parallelism,
                     CancellationToken = cancellationToken,
                 });