ARM: davinci: cp-intc: request the memory region before remapping it

brgl · nsekhar · commit 9cf58a45d72b · 2019-02-19T20:03:34.000+05:30
Add a missing call to request_mem_region() before calling ioremap() to
make sure it's not been requested by another user.

Reviewed-by: David Lechner &lt;david@lechnology.com&gt;
Signed-off-by: Bartosz Golaszewski &lt;bgolaszewski@baylibre.com&gt;
Signed-off-by: Sekhar Nori &lt;nsekhar@ti.com&gt;
diff --git a/arch/arm/mach-davinci/cp_intc.c b/arch/arm/mach-davinci/cp_intc.c
@@ -164,6 +164,15 @@ davinci_cp_intc_do_init(const struct davinci_cp_intc_config *config,
 {
 	unsigned int num_regs = BITS_TO_LONGS(config->num_irqs);
 	int offset, irq_base;
+	void __iomem *req;
+
+	req = request_mem_region(config->reg.start,
+				 resource_size(&config->reg),
+				 "davinci-cp-intc");
+	if (!req) {
+		pr_err("%s: register range busy\n", __func__);
+		return -EBUSY;
+	}
 
 	davinci_cp_intc_base = ioremap(config->reg.start,
 				       resource_size(&config->reg));
