diff --git a/.github/workflows/diff.yml b/.github/workflows/diff.yml
index a6d40960..47b5ecc4 100644
--- a/.github/workflows/diff.yml
+++ b/.github/workflows/diff.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       diffs: ${{ steps.regress-ci.outputs.diffs }}
-    if: ${{ github.event.issue.pull_request }}
+    if: github.event.issue.pull_request && (contains(github.event.comment.body, '\n/ci') || startsWith(github.event.comment.body, '/ci'))
     steps:
       - uses: actions/checkout@v4
 
@@ -55,7 +55,7 @@ jobs:
         with:
           tool: git-delta
 
-      - run: cargo regress diff ${{ matrix.command }} --use-pager-directly
+      - run: cargo regress diff --use-pager-directly ${{ matrix.command }}
         env:
           GH_TOKEN: ${{ github.token }}
           GITHUB_PR: ${{ matrix.pr }}
@@ -63,7 +63,7 @@ jobs:
   summary:
     runs-on: ubuntu-latest
     needs: [diff, generate]
-    if: always() && needs.generate.outputs.diffs != '{}' && needs.generate.outputs.diffs != '[]' && needs.generate.outputs.diffs != ''
+    if: always() && needs.generate.outputs.diffs != '{}' && needs.generate.outputs.diffs != '[]' && needs.generate.outputs.diffs != '' && needs.generate.result == 'success'
     steps:
       - uses: actions/checkout@v4
 
diff --git a/ci/svd2rust-regress/src/svd_test.rs b/ci/svd2rust-regress/src/svd_test.rs
index bdb595c6..7f0f290f 100644
--- a/ci/svd2rust-regress/src/svd_test.rs
+++ b/ci/svd2rust-regress/src/svd_test.rs
@@ -4,7 +4,7 @@ use svd2rust::{util::ToSanitizedCase, Target};
 use crate::{command::CommandExt, tests::TestCase, Opts, TestOpts};
 use std::io::prelude::*;
 use std::path::PathBuf;
-use std::process::{Command, Output};
+use std::process::Command;
 use std::{
     fmt::Write as _,
     fs::{self, File, OpenOptions},
@@ -340,7 +340,7 @@ impl TestCase {
             src_files.sort();
 
             for entry in src_files {
-                let output = Command::new(rustfmt_bin_path)
+                Command::new(rustfmt_bin_path)
                     .arg(entry)
                     .args(["--edition", "2021"])
                     .capture_outputs(