irqchip: skip suspend/resume if base address is null

The gic suspend and resume are registered by initcall.
Skip them if no such gic exists.

Change-Id: I630095c8e7ca6f16003a38d61b4dc359362aa3e3
Signed-off-by: Yimin Peng <yiminp@codeaurora.org>

drivers/irqchip/irq-gic-v3.c

@@ -409,6 +409,9 @@ static void gic_hibernation_suspend(void)
 	void __iomem *base = gic_data.dist_base;
 	void __iomem *rdist_base = gic_data_rdist_sgi_base();
 
+	if ((base == NULL) || (rdist_base == NULL))
+		return;
+
 	gic_data.enabled_sgis = readl_relaxed(rdist_base + GICD_ISENABLER);
 	gic_data.pending_sgis = readl_relaxed(rdist_base + GICD_ISPENDR);
 	/* Store edge level for PPIs by reading GICR_ICFGR1 */
@@ -442,6 +445,9 @@ static void gic_show_resume_irq(struct gic_chip_data *gic)
 	u32 pending[32];
 	void __iomem *base = gic_data.dist_base;
 
+	if (base == NULL)
+		return;
+
 	if (!msm_show_resume_irq_mask)
 		return;
 

drivers/irqchip/irq-gic.c

@@ -249,6 +249,9 @@ static int gic_suspend_one(struct gic_chip_data *gic)
 	unsigned int i;
 	void __iomem *base = gic_data_dist_base(gic);
 
+	if (base == NULL)
+		return 0;
+
 	for (i = 0; i * 32 < gic->gic_irqs; i++) {
 		gic->enabled_irqs[i]
 			= readl_relaxed(base + GIC_DIST_ENABLE_SET + i * 4);
@@ -280,6 +283,9 @@ static void gic_show_resume_irq(struct gic_chip_data *gic)
 	u32 pending[32];
 	void __iomem *base = gic_data_dist_base(gic);
 
+	if (base == NULL)
+		return;
+
 	raw_spin_lock(&irq_controller_lock);
 	for (i = 0; i * 32 < gic->gic_irqs; i++) {
 		enabled = readl_relaxed(base + GIC_DIST_ENABLE_CLEAR + i * 4);