linux-kernel - [PATCH 4.7 116/143] Input: synaptics-rmi4 - fix register descriptor subpacket map construction

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Date:   Mon,  5 Sep 2016 18:44:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andrew Duggan <aduggan@...aptics.com>,
        Nitin Chaudhary <nitinchaudhary1289@...il.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH 4.7 116/143] Input: synaptics-rmi4 - fix register descriptor subpacket map construction

4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andrew Duggan <aduggan@...aptics.com>

commit 3e29d6bb6433ebfa4e187b1164b80baf720d58c3 upstream.

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@...aptics.com>
Tested-by: Nitin Chaudhary <nitinchaudhary1289@...il.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/input/rmi4/rmi_driver.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- 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_de
 		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_de
 		item->reg = reg;
 		item->reg_size = reg_size;
 
+		map_offset = 0;
+
 		do {
 			for (b = 0; b < 7; b++) {
 				if (struct_buf[offset] & (0x1 << b))