linux-toradex.git/drivers/input/evdev.c, branch v3.10.51

Input: evdev - fall back to vmalloc for client event buffer

2013-12-04T18:57:18+00:00

commit 92eb77d0ffbaa71b501a0a8dabf09a351bf4267f upstream.

evdev always tries to allocate the event buffer for clients using
kzalloc rather than vmalloc, presumably to avoid mapping overhead where
possible.  However, drivers like bcm5974, which claims support for
reporting 16 fingers simultaneously, can have an extraordinarily large
buffer.  The resultant contiguous order-4 allocation attempt fails due
to fragmentation, and the device is thus unusable until reboot.

Try kzalloc if we can to avoid the mapping overhead, but if that fails,
fall back to vzalloc.

Signed-off-by: Daniel Stone 
Signed-off-by: Dmitry Torokhov 
Signed-off-by: Greg Kroah-Hartman

Input: fix use-after-free introduced with dynamic minor changes

2012-10-22T05:50:37+00:00

Commit 7f8d4cad1e4e ("Input: extend the number of event (and other)
devices") made evdev, joydev and mousedev to embed struct cdev into
their respective structures representing input devices.

Unfortunately character device structure may outlive the parent
structure unless we do not set it up as parent of character device so
that it will stay pinned until character device is freed.

Also, now that parent structure is pinned while character device exists
we do not need to pin and unpin it every time user opens or closes it.

Reported-by: Dave Jones 
Signed-off-by: Dmitry Torokhov 
Acked-by: Al Viro 
Signed-off-by: Linus Torvalds

Input: extend the number of event (and other) devices

2012-10-08T16:37:55+00:00

Extend the amount of character devices, such as eventX, mouseX and jsX,
from a hard limit of 32 per input handler to about 1024 shared across
all handlers.

To be compatible with legacy installations input handlers will start
creating char devices with minors in their legacy range, however once
legacy range is exhausted they will start allocating minors from the
dynamic range 256-1024.

Reviewed-by: David Herrmann 
Signed-off-by: Dmitry Torokhov

Input: evdev - Add the events() callback

2012-09-19T17:50:18+00:00

By sending a full frame of events at the same time, the irqsoff
latency at heavy load is brought down from 200 us to 100 us.

Cc: Daniel Kurtz 
Tested-by: Benjamin Tissoires 
Tested-by: Ping Cheng 
Acked-by: Dmitry Torokhov 
Signed-off-by: Henrik Rydberg

Input: Break out MT data

2012-09-19T17:50:17+00:00

Move all MT-related things to a separate place. This saves some
bytes for non-mt input devices, and prepares for new MT features.

Reviewed-and-tested-by: Benjamin Tissoires 
Tested-by: Ping Cheng 
Acked-by: Dmitry Torokhov 
Signed-off-by: Henrik Rydberg

Input: evdev - properly handle read/write with count 0

2012-05-02T07:23:58+00:00

According to the standard count 0 is special - no IO should happen but we
can check error conditions (device gone away, etc), and return 0 if there
are no errors. We used to return -EINVAL instead and we also could return 0
if an event was "stolen" by another thread.

Signed-off-by: Dmitry Torokhov

Input: evdev - properly access RCU-protected 'grab' data

2012-05-02T07:23:14+00:00

We should use rcu_dereference_protected() when checking if given client
is the one that grabbed the device. This fixes warnings produced by
sparse.

Signed-off-by: Dmitry Torokhov

Merge branch 'next' into for-linus

2012-03-20T00:02:01+00:00

Merge branch 'for-next' of github.com:rydberg/linux into next

2012-03-09T18:56:35+00:00

Merge commit 'v3.3-rc6' into next

2012-03-09T18:55:17+00:00