[PATCH] irqchip/mxs: fix error check of of_io_request_and_map()

[Vladimir Zapolskiy]

The of_io_request_and_map() returns a valid pointer in iomem region or
ERR_PTR(), check for NULL always fails and may cause a NULL pointer
dereference on error path.

Fixes: 25e34b44313b ("irqchip/mxs: Prepare driver for hardware with different 
offsets")
Signed-off-by: Vladimir Zapolskiy <v...@mleia.com>
---
 drivers/irqchip/irq-mxs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-mxs.c b/drivers/irqchip/irq-mxs.c
index c22e2d4..5bec700 100644
--- a/drivers/irqchip/irq-mxs.c
+++ b/drivers/irqchip/irq-mxs.c
@@ -183,7 +183,7 @@ static void __iomem * __init icoll_init_iobase(struct 
device_node *np)
        void __iomem *icoll_base;
 
        icoll_base = of_io_request_and_map(np, 0, np->name);
-       if (!icoll_base)
+       if (IS_ERR(icoll_base))
                panic("%s: unable to map resource", np->full_name);
        return icoll_base;
 }
-- 
2.1.4