On Thu, Jan 19, 2017 at 10:00 AM, Arvind Yadav
<arvind.yadav.cs@xxxxxxxxx> wrote:
> 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.
> uart.port.mapbase = address;
> uart.port.membase = ioremap_nocache(address, 16);
> + if (!uart.port.membase) {
> + dev_warn(&dev->dev, "Failed to map memory\n");
> + return -ENOMEM;
> + }
You also may do something like
void __iomem *base;
...
base = ioremap_nocache(...);
if (!base)
return -ENOMEM;
// I doubt the message is useful, up to you
memset(&uart, 0, sizeof(uart));
...
uart.port.membase = base;
--
With Best Regards,
Andy Shevchenko
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