[PATCH] driver core: introduce PROBE_FORCE_ASYNCHRONOUS

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Add PROBE_FORCE_ASYNCHRONOUS probe type enum and update
driver_allows_async_probing() to allow asynchronous probing for drivers
marked with this type.

While PROBE_PREFER_ASYNCHRONOUS exists, it represents a temporary opt-in
preference. Subsystems that require asynchronous probing (such as slow
legacy buses) need a dedicated probe type to guarantee asynchronous
execution.

Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---

I am planning to rework serio and gameport subsystems to rely on
asynchronous probing instead of rolling their own implementations.

 drivers/base/dd.c             | 1 +
 include/linux/device/driver.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 60c005223844..34df7b4416ac 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -936,6 +936,7 @@ __setup("driver_async_probe=", save_async_options);
 static bool driver_allows_async_probing(const struct device_driver *drv)
 {
 	switch (drv->probe_type) {
+	case PROBE_FORCE_ASYNCHRONOUS:
 	case PROBE_PREFER_ASYNCHRONOUS:
 		return true;
 
diff --git a/include/linux/device/driver.h b/include/linux/device/driver.h
index 768a1334c0a1..4b3901a35e85 100644
--- a/include/linux/device/driver.h
+++ b/include/linux/device/driver.h
@@ -48,6 +48,7 @@ enum probe_type {
 	PROBE_DEFAULT_STRATEGY,
 	PROBE_PREFER_ASYNCHRONOUS,
 	PROBE_FORCE_SYNCHRONOUS,
+	PROBE_FORCE_ASYNCHRONOUS,
 };
 
 /**
-- 
2.55.0.229.g6434b31f56-goog


-- 
Dmitry