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GFP_ATOMIC memory allocation could fail. In this case, avoid NULL pointer dereference and notify user. Cc: <stable@vger.kernel.org> # 3.2+ Cc: Kim Phillips <kim.phillips@freescale.com> Signed-off-by: Horia Geanta <horia.geanta@freescale.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>