On 11/16/2015 6:37 PM, Sagi Grimberg wrote:--- a/drivers/infiniband/ulp/iser/iser_memory.c +++ b/drivers/infiniband/ulp/iser/iser_memory.c @@ -250,7 +250,7 @@ iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem, struct scatterlist *sg = mem->sg; reg->sge.lkey = device->pd->local_dma_lkey; - reg->rkey = device->mr->rkey; + reg->rkey = device->mr ? device->mr->rkey : 0; reg->sge.addr = ib_sg_dma_address(device->ib_device, &sg[0]); reg->sge.length = ib_sg_dma_len(device->ib_device, &sg[0]);what's the role of this hunk? why it belongs here? you are testing device->mr but this is something global and has nothing to do specially with specific IOs for which this patch aims to act
It's because device->mr might not be allocated at all if always_register=Y, however in this case for all-immediatedata writes I don't need memory registration and I can use pd->local_dma_lkey. This hunk prevents a NULL dereference (as I mentioned, device->mr might not be allocated at all). -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
