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When buffers on the receiption path exceed 262 bytes, the pn533 uses a chaining mechanism where the initiator has to send NULL data frames to fetch the remaining frames. We do that from a workqueue context while holding the cmd lock. Once the MI bit is gone, we aggregate the queued received skbs. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>