enum probe_type
Prev The Basic Device Driver-Model Structures  Next

Name

enum probe_type — device driver probe type to try Device drivers may opt in for special handling of their respective probe routines. This tells the core what to expect and prefer.

Synopsis

enum probe_type {
  PROBE_DEFAULT_STRATEGY,
  PROBE_PREFER_ASYNCHRONOUS,
  PROBE_FORCE_SYNCHRONOUS
};

Constants

PROBE_DEFAULT_STRATEGY

Used by drivers that work equally well whether probed synchronously or asynchronously.

PROBE_PREFER_ASYNCHRONOUS

Drivers for “slow” devices which probing order is not essential for booting the system may opt into executing their probes asynchronously.

PROBE_FORCE_SYNCHRONOUS

Use this to annotate drivers that need their probe routines to run synchronously with driver and device registration (with the exception of -EPROBE_DEFER handling - re-probing always ends up being done asynchronously).

Description

Note that the end goal is to switch the kernel to use asynchronous probing by default, so annotating drivers with PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us to speed up boot process while we are validating the rest of the drivers.

Prev Up Next
struct bus_type Home struct device_driver