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| author | Stefan Nickl <Stefan.Nickl@kontron.com> | 2005-09-05 01:57:46 -0500 |
|---|---|---|
| committer | Dmitry Torokhov <dtor_core@ameritech.net> | 2005-09-05 01:57:46 -0500 |
| commit | 010988e888a0abbe7118635c1b33d049caae6b29 (patch) | |
| tree | 064ebbc4e054bb19bb685475bcc07be21d6a1b76 /Documentation/tipar.txt | |
| parent | 7d25258f69cedc2f2e55eb25ba2e2078060b44f4 (diff) | |
Input: HIDDEV - make HIDIOCSREPORT wait IO completion
When trying to make the hiddev driver issue several Set_Report control
transfers to a custom device with 2.6.13-rc6, only the first transfer in a
row is carried out, while others immediately following it are silently
dropped.
This happens where hid_submit_report() (in hid-core.c) tests for
HID_CTRL_RUNNING, which seems to be still set because the first transfer is
not finished yet.
As a workaround, inserting a delay between the two calls to
ioctl(HIDIOCSREPORT) in userspace "solves" the problem. The
straightforward fix is to add a call to hid_wait_io() to the implementation
of HIDIOCSREPORT (in hiddev.c), just like for HIDIOCGREPORT. Works fine
for me.
Apparently, this issue has some history:
http://marc.theaimsgroup.com/?l=linux-usb-users&m=111100670105558&w=2
Signed-off-by: Stefan Nickl <Stefan.Nickl@kontron.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'Documentation/tipar.txt')
0 files changed, 0 insertions, 0 deletions