From: Bart Van Assche Date: Thu, 21 Jul 2016 20:03:09 +0000 (-0700) Subject: IB/core: Make rdma_rw_ctx_init() initialize all used fields X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=eaa74ec7329a48a4b724d8de440b3a2cbaabf7c8;p=linux-beck.git IB/core: Make rdma_rw_ctx_init() initialize all used fields Some but not all callers of rdma_rw_ctx_init() zero-initialize struct rdma_rw_ctx. Hence make rdma_rw_ctx_init() initialize all work request fields that will be read by ib_post_send(). Fixes: a060b5629ab0 ("IB/core: generic RDMA READ/WRITE API") Signed-off-by: Bart Van Assche Reviewed-by: Sagi Grimberg Reviewed-by: Christoph Hellwig Tested-by: Steve Wise Tested-by: Laurence Oberman Cc: Parav Pandit Cc: Nicholas Bellinger Cc: #v4.7+ Signed-off-by: Doug Ledford --- diff --git a/drivers/infiniband/core/rw.c b/drivers/infiniband/core/rw.c index 1eb9b1294a63..1ad2baaa6c8c 100644 --- a/drivers/infiniband/core/rw.c +++ b/drivers/infiniband/core/rw.c @@ -71,6 +71,7 @@ static inline u32 rdma_rw_fr_page_list_len(struct ib_device *dev) return min_t(u32, dev->attrs.max_fast_reg_page_list_len, 256); } +/* Caller must have zero-initialized *reg. */ static int rdma_rw_init_one_mr(struct ib_qp *qp, u8 port_num, struct rdma_rw_reg_ctx *reg, struct scatterlist *sg, u32 sg_cnt, u32 offset) @@ -114,6 +115,7 @@ static int rdma_rw_init_mr_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num, struct scatterlist *sg, u32 sg_cnt, u32 offset, u64 remote_addr, u32 rkey, enum dma_data_direction dir) { + struct rdma_rw_reg_ctx *prev = NULL; u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device); int i, j, ret = 0, count = 0; @@ -125,7 +127,6 @@ static int rdma_rw_init_mr_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, } for (i = 0; i < ctx->nr_ops; i++) { - struct rdma_rw_reg_ctx *prev = i ? &ctx->reg[i - 1] : NULL; struct rdma_rw_reg_ctx *reg = &ctx->reg[i]; u32 nents = min(sg_cnt, pages_per_mr); @@ -162,9 +163,13 @@ static int rdma_rw_init_mr_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, sg_cnt -= nents; for (j = 0; j < nents; j++) sg = sg_next(sg); + prev = reg; offset = 0; } + if (prev) + prev->wr.wr.next = NULL; + ctx->type = RDMA_RW_MR; return count; @@ -205,11 +210,10 @@ static int rdma_rw_init_map_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, rdma_wr->wr.opcode = IB_WR_RDMA_READ; rdma_wr->remote_addr = remote_addr + total_len; rdma_wr->rkey = rkey; + rdma_wr->wr.num_sge = nr_sge; rdma_wr->wr.sg_list = sge; for (j = 0; j < nr_sge; j++, sg = sg_next(sg)) { - rdma_wr->wr.num_sge++; - sge->addr = ib_sg_dma_address(dev, sg) + offset; sge->length = ib_sg_dma_len(dev, sg) - offset; sge->lkey = qp->pd->local_dma_lkey; @@ -220,8 +224,8 @@ static int rdma_rw_init_map_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, offset = 0; } - if (i + 1 < ctx->nr_ops) - rdma_wr->wr.next = &ctx->map.wrs[i + 1].wr; + rdma_wr->wr.next = i + 1 < ctx->nr_ops ? + &ctx->map.wrs[i + 1].wr : NULL; } ctx->type = RDMA_RW_MULTI_WR;