fbtft: Fix the initialization from property algorithm

When converting to device property API the commit
8500770b3aa8 ("fbtft: Make use of device property API")
mistakenly placed the reading of the first value inside the loop,
that jumps over value after initialization sequence or sleep commands.

Move the above mentioned reading outside of the loop to restore
correct behaviour.

Besides that, we are using pre-increment operation which may lead to
out of the boundary access at the end of sequence. Thus, allocate buffer
with an additional element at the end to prevent out of the boundary
access.

Fixes: 8500770b3aa8 ("fbtft: Make use of device property API")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20191121140207.65089-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
index ffb84987dd867fb5030ec56bf2cfc261bb7d605f..d3e098b41b1a4698878950299a4cf2273798f42a 100644 (file)
--- a/drivers/staging/fbtft/fbtft-core.c
+++ b/drivers/staging/fbtft/fbtft-core.c
@@ -913,7 +913,7 @@ static int fbtft_init_display_from_property(struct fbtft_par *par)
        if (count == 0)
                return -EINVAL;
 
-       values = kmalloc_array(count, sizeof(*values), GFP_KERNEL);
+       values = kmalloc_array(count + 1, sizeof(*values), GFP_KERNEL);
        if (!values)
                return -ENOMEM;
 
@@ -926,9 +926,9 @@ static int fbtft_init_display_from_property(struct fbtft_par *par)
                gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
 
        index = -1;
-       while (index < count) {
-               val = values[++index];
+       val = values[++index];
 
+       while (index < count) {
                if (val & FBTFT_OF_INIT_CMD) {
                        val &= 0xFFFF;
                        i = 0;