https://github.com/torvalds/linux
Revision fc7392aa1b20debc7f398acc39ffc817630f11e6 authored by Elias Vanderstuyft on 29 March 2014, 19:08:45 UTC, committed by Dmitry Torokhov on 29 March 2014, 19:13:09 UTC
If a new (id == -1) ff effect was uploaded from userspace,
ff-core.c::input_ff_upload() will have assigned a positive number to the
new effect id.  Currently, evdev.c::evdev_do_ioctl() will save this new id
to userspace, regardless of whether the upload succeeded or not.

On upload failure, this can be confusing because the dev->ff->effects[]
array will not contain an element at the index of that new effect id.

This patch fixes this by leaving the id unchanged after upload fails.

Note: Unfortunately applications should still expect changed effect id for
quite some time.

This has been discussed on:
http://www.mail-archive.com/linux-input@vger.kernel.org/msg08513.html
("ff-core effect id handling in case of a failed effect upload")

Suggested-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Elias Vanderstuyft <elias.vds@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
1 parent 8a0435d
History
Tip revision: fc7392aa1b20debc7f398acc39ffc817630f11e6 authored by Elias Vanderstuyft on 29 March 2014, 19:08:45 UTC
Input: don't modify the id of ioctl-provided ff effect on upload failure
Tip revision: fc7392a
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