CRIS v32: Should index be positive?

`port' is used as index for writing to pins during
allocation/deallocation. It should be positive.
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Signed-off-by: NJesper Nilsson <jesper.nilsson@axis.com>

arch/cris/arch-v32/kernel/pinmux.c

@@ -54,7 +54,7 @@ crisv32_pinmux_alloc(int port, int first_pin, int last_pin, enum pin_mode mode)
 
 	crisv32_pinmux_init();
 
-	if (port > PORTS)
+	if (port > PORTS || port < 0)
 		return -EINVAL;
 
 	spin_lock_irqsave(&pinmux_lock, flags);
@@ -197,7 +197,7 @@ crisv32_pinmux_dealloc(int port, int first_pin, int last_pin)
 
 	crisv32_pinmux_init();
 
-	if (port > PORTS)
+	if (port > PORTS || port < 0)
 		return -EINVAL;
 
 	spin_lock_irqsave(&pinmux_lock, flags);

arch/cris/arch-v32/mach-a3/pinmux.c

@@ -242,7 +242,7 @@ crisv32_pinmux_dealloc(int port, int first_pin, int last_pin)
 
 	crisv32_pinmux_init();
 
-	if (port > PORTS)
+	if (port > PORTS || port < 0)
 		return -EINVAL;
 
 	spin_lock_irqsave(&pinmux_lock, flags);

arch/cris/arch-v32/mach-fs/pinmux.c

@@ -54,7 +54,7 @@ crisv32_pinmux_alloc(int port, int first_pin, int last_pin, enum pin_mode mode)
 
 	crisv32_pinmux_init();
 
-	if (port > PORTS)
+	if (port > PORTS || port < 0)
 		return -EINVAL;
 
 	spin_lock_irqsave(&pinmux_lock, flags);
@@ -195,7 +195,7 @@ int crisv32_pinmux_dealloc(int port, int first_pin, int last_pin)
 
 	crisv32_pinmux_init();
 
-	if (port > PORTS)
+	if (port > PORTS || port < 0)
 		return -EINVAL;
 
 	spin_lock_irqsave(&pinmux_lock, flags);