3.16.44-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
commit 0fd27a88c2e4f548937fd7d93fc6e65c4ad7c278 upstream.
When we initialize buffer to create SRQ in kernel,
the number of pages was less than actually used in
following mlx5_fill_page_array().
Fixes: e126ba97dba9 ("mlx5: Add driver for Mellanox Connect-IB adapters")
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Reviewed-by: Eli Cohen <eli@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/drivers/infiniband/hw/mlx5/srq.c
+++ b/drivers/infiniband/hw/mlx5/srq.c
@@ -156,8 +156,6 @@ static int create_srq_kernel(struct mlx5
int err;
int i;
struct mlx5_wqe_srq_next_seg *next;
- int page_shift;
- int npages;
err = mlx5_db_alloc(&dev->mdev, &srq->db);
if (err) {
@@ -172,7 +170,6 @@ static int create_srq_kernel(struct mlx5
err = -ENOMEM;
goto err_db;
}
- page_shift = srq->buf.page_shift;
srq->head = 0;
srq->tail = srq->msrq.max - 1;
@@ -184,10 +181,8 @@ static int create_srq_kernel(struct mlx5
cpu_to_be16((i + 1) & (srq->msrq.max - 1));
}
- npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
- mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
- buf_size, page_shift, srq->buf.npages, npages);
- *inlen = sizeof(**in) + sizeof(*(*in)->pas) * npages;
+ mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);
+ *inlen = sizeof(**in) + sizeof(*(*in)->pas) * srq->buf.npages;
*in = mlx5_vzalloc(*inlen);
if (!*in) {
err = -ENOMEM;
@@ -204,7 +199,7 @@ static int create_srq_kernel(struct mlx5
}
srq->wq_sig = !!srq_signature;
- (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
+ (*in)->ctx.log_pg_sz = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
return 0;