[PATCH v1] irqchip: irq-mips-gic:- Handle return NULL error from ioremap_nocache

[Arvind Yadav]

Here, If ioremap_nocache will fail. It will return NULL.
Kernel can run into a NULL-pointer dereference.
This error check will avoid NULL pointer dereference.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx>
---
 drivers/irqchip/irq-mips-gic.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index c01c09e..eeea2e8 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -979,6 +979,8 @@ static void __init __gic_init(unsigned long gic_base_addr,
 	__gic_base_addr = gic_base_addr;
 
 	gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size);
+	if (!gic_base)
+		panic("Failed to map GIC memory");
 
 	gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
 	gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
-- 
1.9.1