tree 1a798db8c77e301508d26e8e10c1b1974bdef749
parent 6dec143a50c01ca0cc0afcbf5ea4bb8e87981edf
author Pete Zaitcev <zaitcev@redhat.com> 1271096171 -0600
committer Jiri Kosina <jkosina@suse.cz> 1271166949 +0200

HID: non-overlapping zeroing of extra bits

From my review of the way the unused bits of report are being zeroed,
it seems like there must be a bug. Currently, the zeroing is done
in hid_output_field and it covers any bits between the last used bit
and the end of the byte. But in case of, say, my keyboard, NumLock is
mask 0x01 and CapsLock is 0x02. Invoking hid_output_field for NumLock
definitely zeroes across CapsLock. The only reason this works is that
the fields are sorted by the offset.

It would be more correct and simpler to zero-fill the buffer into
which the fields are set.

The patch is tested with an IBM keyboard that is improperly sensitive
to out-of-report pad bits, the extra bits are still zeroed and the
fields continue to work as expected. It is also tested with good
keyboards.

In case, a related bug in RHEL 5 is tracked with Red Hat bug 513934.

Signed-off-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>