Input: synaptics-rmi4 - fix register descriptor subpacket map construction

The map_offset variable is specific to the register and needs to be reset
in the loop. Otherwise, subsequent register's subpacket maps will have
their bits set at the wrong index.

Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Tested-by: Nitin Chaudhary <nitinchaudhary1289@gmail.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
index faa295ec4f313a0f629fa3f2fa9ce5267c929b10..c83bce89028b2a2d270ffa3aed232788b8b491b6 100644 (file)
--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c
@@ -553,7 +553,6 @@ int rmi_read_register_desc(struct rmi_device *d, u16 addr,
                goto free_struct_buff;
 
        reg = find_first_bit(rdesc->presense_map, RMI_REG_DESC_PRESENSE_BITS);
-       map_offset = 0;
        for (i = 0; i < rdesc->num_registers; i++) {
                struct rmi_register_desc_item *item = &rdesc->registers[i];
                int reg_size = struct_buf[offset];
@@ -576,6 +575,8 @@ int rmi_read_register_desc(struct rmi_device *d, u16 addr,
                item->reg = reg;
                item->reg_size = reg_size;
 
+               map_offset = 0;
+
                do {
                        for (b = 0; b < 7; b++) {
                                if (struct_buf[offset] & (0x1 << b))