From: Hui Wang hui.wang@canonical.com
commit 771a081e44a9baa1991ef011cc453ef425591740 upstream.
In the function alps_is_cs19_trackpoint(), we check if the param[1] is in the 0x20~0x2f range, but the code we wrote for this checking is not correct: (param[1] & 0x20) does not mean param[1] is in the range of 0x20~0x2f, it also means the param[1] is in the range of 0x30~0x3f, 0x60~0x6f...
Now fix it with a new condition checking ((param[1] & 0xf0) == 0x20).
Fixes: 7e4935ccc323 ("Input: alps - don't handle ALPS cs19 trackpoint-only device") Cc: stable@vger.kernel.org Signed-off-by: Hui Wang hui.wang@canonical.com Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/input/mouse/alps.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/input/mouse/alps.c +++ b/drivers/input/mouse/alps.c @@ -2875,7 +2875,7 @@ static bool alps_is_cs19_trackpoint(stru * trackpoint-only devices have their variant_ids equal * TP_VARIANT_ALPS and their firmware_ids are in 0x20~0x2f range. */ - return param[0] == TP_VARIANT_ALPS && (param[1] & 0x20); + return param[0] == TP_VARIANT_ALPS && ((param[1] & 0xf0) == 0x20); }
static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)