MIPS: lantiq: Change variables to the same type as the source

A structure irq_data, irq_desc_get_irq() and irq_linear_revmap() use
a different type than defined in the lantiq ICU driver, which is using
signed integers. The substracted result should never be negative nor is
tested for that situation. Change it to unsigned.

Signed-off-by: Petr Cvek <petrcvekcz@gmail.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: hauke@hauke-m.de
Cc: john@phrozen.org
Cc: linux-mips@vger.kernel.org
Cc: openwrt-devel@lists.openwrt.org
Cc: pakahmar@hotmail.com

arch/mips/lantiq/irq.c

@@ -77,8 +77,8 @@ int ltq_eiu_get_irq(int exin)
 
 void ltq_disable_irq(struct irq_data *d)
 {
-	int offset = d->hwirq - MIPS_CPU_IRQ_CASCADE;
-	int im = offset / INT_NUM_IM_OFFSET;
+	unsigned long offset = d->hwirq - MIPS_CPU_IRQ_CASCADE;
+	unsigned long im = offset / INT_NUM_IM_OFFSET;
 
 	offset %= INT_NUM_IM_OFFSET;
 	ltq_icu_w32(im, ltq_icu_r32(im, LTQ_ICU_IM0_IER) & ~BIT(offset),
@@ -87,8 +87,8 @@ void ltq_disable_irq(struct irq_data *d)
 
 void ltq_mask_and_ack_irq(struct irq_data *d)
 {
-	int offset = d->hwirq - MIPS_CPU_IRQ_CASCADE;
-	int im = offset / INT_NUM_IM_OFFSET;
+	unsigned long offset = d->hwirq - MIPS_CPU_IRQ_CASCADE;
+	unsigned long im = offset / INT_NUM_IM_OFFSET;
 
 	offset %= INT_NUM_IM_OFFSET;
 	ltq_icu_w32(im, ltq_icu_r32(im, LTQ_ICU_IM0_IER) & ~BIT(offset),
@@ -98,8 +98,8 @@ void ltq_mask_and_ack_irq(struct irq_data *d)
 
 static void ltq_ack_irq(struct irq_data *d)
 {
-	int offset = d->hwirq - MIPS_CPU_IRQ_CASCADE;
-	int im = offset / INT_NUM_IM_OFFSET;
+	unsigned long offset = d->hwirq - MIPS_CPU_IRQ_CASCADE;
+	unsigned long im = offset / INT_NUM_IM_OFFSET;
 
 	offset %= INT_NUM_IM_OFFSET;
 	ltq_icu_w32(im, BIT(offset), LTQ_ICU_IM0_ISR);
@@ -107,8 +107,8 @@ static void ltq_ack_irq(struct irq_data *d)
 
 void ltq_enable_irq(struct irq_data *d)
 {
-	int offset = d->hwirq - MIPS_CPU_IRQ_CASCADE;
-	int im = offset / INT_NUM_IM_OFFSET;
+	unsigned long offset = d->hwirq - MIPS_CPU_IRQ_CASCADE;
+	unsigned long im = offset / INT_NUM_IM_OFFSET;
 
 	offset %= INT_NUM_IM_OFFSET;
 	ltq_icu_w32(im, ltq_icu_r32(im, LTQ_ICU_IM0_IER) | BIT(offset),
@@ -224,9 +224,9 @@ static struct irq_chip ltq_eiu_type = {
 
 static void ltq_hw_irq_handler(struct irq_desc *desc)
 {
-	int module = irq_desc_get_irq(desc) - 2;
+	unsigned int module = irq_desc_get_irq(desc) - 2;
 	u32 irq;
-	int hwirq;
+	irq_hw_number_t hwirq;
 
 	irq = ltq_icu_r32(module, LTQ_ICU_IM0_IOSR);
 	if (irq == 0)