[PATCH v2 0/7] Simplify event handling logic in input core

Dmitry Torokhov
2024-07-03T21:38:06Z

This series tries to untangle somewhat convoluted logic in the input
event processing in the input core by realizing that input handler can
be either a filter, or a handler that handles a single event at a time,
or a handler that can handle a sequence of events, but should not mix
the 3 behaviors in one handler. This allows us to reduce both filter
functionality and single-event handling functionality to batch handling
and have the main event handling path to only deal with
input_handle->events() batch method.

v2: addressed comments from Benjamin:

- added missing patch to remove evdev->event() implementation
- allow not specifying any event handling method to satisfy kgdboc
handler
- expanded comment on order of running input handlers when passing
events
- split pre-allocation into 2 patches and moved removal of count check
into 3rd patch.

Dmitry Torokhov (7):
Input: evdev - remove ->event() method
Input: make sure input handlers define only one processing method
Input: make events() method return number of events processed
Input: simplify event handling logic
Input: rearrange input_alloc_device() to prepare for preallocating of vals
Input: preallocate memory to hold event values
Input: do not check number of events in input_pass_values()

drivers/input/evdev.c | 16 +--
drivers/input/input.c | 230 ++++++++++++++++++++++++++++--------------
include/linux/input.h | 7 +-
3 files changed, 163 insertions(+), 90 deletions(-)

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2.45.2.803.g4e1b14247a-goog