mfd: Fix error in wm8400 reg cache access check

Accessing num_reg elements in the interval [reg .. reg+num_regs)
is permitted if (reg+numregs <= array size), so barf when that
excluded upper bound is > array size. The prior -1 would give
access to one too many elements.

Signed-off-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/wm8400-core.c b/drivers/mfd/wm8400-core.c
index 865ce01..e08aafa 100644 (file)
--- a/drivers/mfd/wm8400-core.c
+++ b/drivers/mfd/wm8400-core.c
@@ -118,7 +118,7 @@ static int wm8400_read(struct wm8400 *wm8400, u8 reg, int num_regs, u16 *dest)
 {
        int i, ret = 0;
 
-       BUG_ON(reg + num_regs - 1 > ARRAY_SIZE(wm8400->reg_cache));
+       BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache));
 
        /* If there are any volatile reads then read back the entire block */
        for (i = reg; i < reg + num_regs; i++)
@@ -144,7 +144,7 @@ static int wm8400_write(struct wm8400 *wm8400, u8 reg, int num_regs,
 {
        int ret, i;
 
-       BUG_ON(reg + num_regs - 1 > ARRAY_SIZE(wm8400->reg_cache));
+       BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache));
 
        for (i = 0; i < num_regs; i++) {
                BUG_ON(!reg_data[reg + i].writable);