From 2d7f67fd2368cd50776ed09d6429113b49b21669 Mon Sep 17 00:00:00 2001
From: Jens Steube <jens.steube@gmail.com>
Date: Tue, 15 Jun 2021 14:06:24 +0200
Subject: [PATCH] Alias Devices: Show a warning in case the user specifically
 listed a device to use which in a later step is skipped because it is an
 alias of another active device

---
 docs/changes.txt |  1 +
 src/backend.c    | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/docs/changes.txt b/docs/changes.txt
index 098b6a3d3..48e1ca44d 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -10,6 +10,7 @@
 ## Improvements
 ##
 
+- Alias Devices: Show a warning in case the user specifically listed a device to use which in a later step is skipped because it is an alias of another active device
 - Backend Information: Added new column showing the PCI Address per CUDA/OpenCL device to easier identify broken cards
 
 * changes v6.2.1 -> v6.2.2
diff --git a/src/backend.c b/src/backend.c
index d868645b4..9f3a54f52 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -131,6 +131,17 @@ static int backend_ctx_find_alias_devices (hashcat_ctx_t *hashcat_ctx)
       backend_ctx->opencl_devices_active--;
 
       backend_ctx->backend_devices_active--;
+
+      // show a warning for specifically listed devices if they are an alias
+
+      if (backend_ctx->backend_devices_filter != (u64) -1)
+      {
+        if (backend_ctx->backend_devices_filter & (1ULL << alias_device->device_id))
+        {
+          event_log_warning (hashcat_ctx, "The device #%d specifically listed was skipped because it is an alias of device #%d", alias_device->device_id + 1, backend_device->device_id + 1);
+          event_log_warning (hashcat_ctx, NULL);
+        }
+      }
     }
   }