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HID: wacom - make sure touch_input is valid before using it 

touch_input is stored in wacom_shared for pen data to report touch
switch status. It is possible, although we didn't see it happen on
Linux yet, that pen data is procesed before touch interface is
fully probed.

As a by-product of this patch, it fixes the FreeBSD issue reported
by Denis Akiyakov http://www.spinics.net/lists/linux-input/msg33971.html

Reviewed-by: Hans Petter Selasky <hps@selasky.org>
Tested-by: Denis Akiyakov <d.akiyakov@gmail.com>
Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Ping Cheng 2014-11-06 17:30:51 -08:00 committed by Jiri Kosina
parent 7f474df0a7
commit 44b9683853
1 changed files with 5 additions and 2 deletions
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7
drivers/hid/wacom_wac.c
View File

@ -1681,7 +1681,9 @@ static int wacom_bpt_pen(struct wacom_wac *wacom)
return 0;
if (data[0] == WACOM_REPORT_USB) {
if (features->type == INTUOSHT && features->touch_max) {
if (features->type == INTUOSHT &&
wacom->shared->touch_input &&
features->touch_max) {
input_report_switch(wacom->shared->touch_input,
SW_MUTE_DEVICE, data[8] & 0x40);
input_sync(wacom->shared->touch_input);
@ -1774,7 +1776,8 @@ static int wacom_wireless_irq(struct wacom_wac *wacom, size_t len)
int pid, battery, ps_connected;
if ((wacom->shared->type == INTUOSHT) &&
wacom->shared->touch_max) {
wacom->shared->touch_input &&
wacom->shared->touch_max) {
input_report_switch(wacom->shared->touch_input,
SW_MUTE_DEVICE, data[5] & 0x40);
input_sync(wacom->shared->touch_input);