Merge branch 'for-7.3/core' into for-linus

- fix long-standing force-feedback initialization race across the subsystem
  (Dmitry Torokhov)
- switch to system_dfl_wq (Marco Crivellari)

1 files changed, 34 insertions, 0 deletions

diff --git a/scripts/coccinelle/hid/ff_race.cocci b/scripts/coccinelle/hid/ff_race.cocci
new file mode 100644
index 000000000000..479f5d1e3184
--- /dev/null
+++ b/scripts/coccinelle/hid/ff_race.cocci
@@ -0,0 +1,34 @@
+/// Detect HID drivers that initialize force-feedback after hid_hw_start()
+/// when HID_CONNECT_HIDINPUT is used. This is a lifecycle violation as
+/// the input device is already registered.
+//
+// Confidence: High
+// Copyright: (C) 2026 Gemini. GPLv2.
+
+virtual report
+
+@r@
+identifier probe_fn;
+expression hdev, flags;
+position p1, p2;
+@@
+
+probe_fn(struct hid_device *hdev, ...) {
+  <...
+  hid_hw_start@p1(hdev, flags)
+  ...
+  \(input_ff_create\|input_ff_create_memless\)@p2(...)
+  ...>
+}
+
+@script:python depends on report@
+p1 << r.p1;
+p2 << r.p2;
+flags << r.flags;
+@@
+
+# Check if flags include HID_CONNECT_HIDINPUT (0x01) or HID_CONNECT_DEFAULT (0x0f)
+# Note: HID_CONNECT_DEFAULT is 0x0f, HID_CONNECT_HIDINPUT is 0x01
+if "HID_CONNECT_HIDINPUT" in flags or "HID_CONNECT_DEFAULT" in flags:
+    msg = "WARNING: force-feedback initialized after hid_hw_start() with HID_CONNECT_HIDINPUT. Input device is already registered at this point. Use .input_configured() instead."
+    coccilib.report.print_report(p2[0], msg)