bq27x00_battery: use unaligned access helper

Remove hand-rolled get_unaligned_be16, this points to a possible bug as
bq27x00_read does another endian byteswap which sparse notices:

drivers/power/bq27x00_battery.c:81:14: warning: cast to restricted __be16
Which should probably be checked.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Cc: Rodolfo Giometti <giometti@linux.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index 62d4948e8206..0c056fcc01ce 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -23,8 +23,8 @@
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/idr.h>
-
 #include <linux/i2c.h>
+#include <asm/unaligned.h>
 
 #define DRIVER_VERSION                  "1.0.0"
 
@@ -33,7 +33,6 @@
 #define BQ27x00_REG_RSOC                0x0B /* Relative State-of-Charge */
 #define BQ27x00_REG_AI                  0x14
 #define BQ27x00_REG_FLAGS               0x0A
-#define HIGH_BYTE(A)                    ((A) << 8)
 
 /* If the system has several batteries we need a different name for each
  * of them...
@@ -239,7 +238,7 @@ static int bq27200_read(u8 reg, int *rt_value, int b_single,
                 err = i2c_transfer(client->adapter, msg, 1);
                 if (err >= 0) {
                         if (!b_single)
-                                *rt_value = data[1] | HIGH_BYTE(data[0]);
+                                *rt_value = get_unaligned_be16(data);
                         else
                                 *rt_value = data[0];