[ARM] pxa: introduce dedicated __mfp_validate() to check PXA2xx MFP

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 14 insertions, 6 deletions

diff --git a/arch/arm/mach-pxa/mfp-pxa2xx.c b/arch/arm/mach-pxa/mfp-pxa2xx.c
index d1cdb4ecb0b..ed91c043471 100644
--- a/arch/arm/mach-pxa/mfp-pxa2xx.c
+++ b/arch/arm/mach-pxa/mfp-pxa2xx.c
@@ -91,6 +91,18 @@ static int __mfp_config_gpio(unsigned gpio, unsigned long c)
         return 0;
 }
 
+static inline int __mfp_validate(int mfp)
+{
+        int gpio = mfp_to_gpio(mfp);
+
+        if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
+                pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
+                return -1;
+        }
+
+        return gpio;
+}
+
 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
 {
         unsigned long flags;
@@ -99,13 +111,9 @@ void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
 
         for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
 
-                gpio = mfp_to_gpio(MFP_PIN(*c));
-
-                if (!gpio_desc[gpio].valid) {
-                        pr_warning("%s: GPIO%d is invalid pin\n",
-                                __func__, gpio);
+                gpio = __mfp_validate(MFP_PIN(*c));
+                if (gpio < 0)
                         continue;
-                }
 
                 local_irq_save(flags);