gpio: tegra: don't access nonexistent pins

Store how many pins exist per port in a table and limit accesses based
on that table. This will prevent reading nonexistent registers

Change-Id: I94c8393565970849fd4d731721824245e50258d5
Signed-off-by: Edgardo Handal <ehandal@nvidia.com>
Reviewed-on: http://git-master/r/1223135
GVS: Gerrit_Virtual_Submit
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
index 3ed3e00ac..4c5d718b6 100644
--- a/drivers/gpio/gpio-tegra186.c
+++ b/drivers/gpio/gpio-tegra186.c
@@ -123,6 +123,11 @@ static int tegra186_gpio_map[MAX_GPIO_CONTROLLERS][MAX_GPIO_PORTS] = {
         {31, 18, 20, 30, 21, 22, 26, 25},/* AON gpio cntrlr */
 };
 
+static u32 tegra186_gpio_port_pin_count[MAX_PORTS] = {
+        7, 7, 7, 6, 8, 6, 6, 7, 8, 8, 1, 8, 6, 7, 4, 7,
+        6, 6, 5, 4, 6, 8, 8, 8, 7, 4, 8, 2, 4, 0, 3, 5,
+};
+
 static u32 address_map[32][2];
 static u32 tegra_gpio_bank_count;
 static struct tegra_gpio_controller
@@ -199,6 +204,9 @@ static inline bool is_gpio_accessible(u32 offset)
         if (controller == -1)
                 return false;
 
+        if (pin >= tegra186_gpio_port_pin_count[port])
+                return false;
+
         for (i = 0; i < MAX_GPIO_CONTROLLERS; i++) {
                 for (j = 0; j < MAX_GPIO_PORTS; j++) {
                         if (tegra186_gpio_map[i][j] == port) {