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ntb: Drop packets when qp link is down
commit f195a1a upstream. Currently when the transport receive packets after netdev has closed the transport returns error and triggers tx errors to be incremented and carrier to be stopped. There is no reason to return error if the device is already closed. Drop the packet and return 0. Fixes: e26a584 ("NTB: Split ntb_hw_intel and ntb_transport drivers") Reported-by: Yuan Y Lu <yuan.y.lu@intel.com> Tested-by: Yuan Y Lu <yuan.y.lu@intel.com> Reviewed-by: Logan Gunthorpe <logang@deltatee.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Jon Mason <jdmason@kudzu.us> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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