From 2c34e68f426151bc6d16de6a187678f6693c0770 Mon Sep 17 00:00:00 2001 From: Yan Burman Date: Tue, 11 Mar 2014 14:41:47 +0200 Subject: [PATCH] IB/mad: Check and handle potential DMA mapping errors Running with DMA_API_DEBUG enabled and not checking for DMA mapping errors triggers a kernel stack trace with "DMA-API: device driver failed to check map error" message. Add these checks to the MAD module, both to be be more robust and also eliminate these false-positive stack traces. Signed-off-by: Yan Burman Signed-off-by: Or Gerlitz Signed-off-by: Roland Dreier --- drivers/infiniband/core/mad.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c index 4c837e66516b..ab31f136d04b 100644 --- a/drivers/infiniband/core/mad.c +++ b/drivers/infiniband/core/mad.c @@ -1022,12 +1022,21 @@ int ib_send_mad(struct ib_mad_send_wr_private *mad_send_wr) mad_send_wr->send_buf.mad, sge[0].length, DMA_TO_DEVICE); + if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[0].addr))) + return -ENOMEM; + mad_send_wr->header_mapping = sge[0].addr; sge[1].addr = ib_dma_map_single(mad_agent->device, ib_get_payload(mad_send_wr), sge[1].length, DMA_TO_DEVICE); + if (unlikely(ib_dma_mapping_error(mad_agent->device, sge[1].addr))) { + ib_dma_unmap_single(mad_agent->device, + mad_send_wr->header_mapping, + sge[0].length, DMA_TO_DEVICE); + return -ENOMEM; + } mad_send_wr->payload_mapping = sge[1].addr; spin_lock_irqsave(&qp_info->send_queue.lock, flags); @@ -2590,6 +2599,11 @@ static int ib_mad_post_receive_mads(struct ib_mad_qp_info *qp_info, sizeof *mad_priv - sizeof mad_priv->header, DMA_FROM_DEVICE); + if (unlikely(ib_dma_mapping_error(qp_info->port_priv->device, + sg_list.addr))) { + ret = -ENOMEM; + break; + } mad_priv->header.mapping = sg_list.addr; recv_wr.wr_id = (unsigned long)&mad_priv->header.mad_list; mad_priv->header.mad_list.mad_queue = recv_queue;