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When ioremap_nocache fails, the lack of error-handling code may cause unexpected results. This patch adds error-handling code after calling ioremap_nocache. Signed-off-by: Zhouyang Jia <[email protected]> Acked-by: Samuel Iglesias Gonsalvez <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>