4.19-stable review patch. If anyone has any objections, please let me know.
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From: Brian Norris briannorris@chromium.org
commit ac5722c1643a2fb75224c79b578214956d34f989 upstream.
The cros_ec_keyb_bs array lists buttons and switches together, expecting that its users will match the appropriate type and bit fields. But cros_ec_keyb_register_bs() only checks the 'bit' field, which causes misreported input capabilities in some cases. For example, tablets (e.g., Scarlet -- a.k.a. Acer Chromebook Tab 10) were reporting a SW_LID capability, because EC_MKBP_POWER_BUTTON and EC_MKBP_LID_OPEN happen to share the same bit.
(This has comedic effect on a tablet, in which a power-management daemon then thinks this "lid" is closed, and so puts the system to sleep as soon as it boots!)
To fix this, check both the 'ev_type' and 'bit' fields before reporting the capability.
Tested with a lid (Kevin / Samsung Chromebook Plus) and without a lid (Scarlet / Acer Chromebook Tab 10).
This error got introduced when porting the feature from the downstream Chromium OS kernel to be upstreamed.
Fixes: cdd7950e7aa4 ("input: cros_ec_keyb: Add non-matrix buttons and switches") Cc: stable@vger.kernel.org Signed-off-by: Brian Norris briannorris@chromium.org Reviewed-by: Heiko Stuebner heiko@sntech.de Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/input/keyboard/cros_ec_keyb.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/input/keyboard/cros_ec_keyb.c +++ b/drivers/input/keyboard/cros_ec_keyb.c @@ -493,7 +493,8 @@ static int cros_ec_keyb_register_bs(stru for (i = 0; i < ARRAY_SIZE(cros_ec_keyb_bs); i++) { const struct cros_ec_bs_map *map = &cros_ec_keyb_bs[i];
- if (buttons & BIT(map->bit)) + if ((map->ev_type == EV_KEY && (buttons & BIT(map->bit))) || + (map->ev_type == EV_SW && (switches & BIT(map->bit)))) input_set_capability(idev, map->ev_type, map->code); }