RDMA/cxgb4: Save the correct map length for fast_reg_page_lists
We cannot save the mapped length using the rdma max_page_list_len field
of the ib_fast_reg_page_list struct because the core code uses it. This
results in an incorrect unmap of the page list in c4iw_free_fastreg_pbl().
I found this with dma mapping debugging enabled in the kernel. The
fix is to save the length in the c4iw_fr_page_list struct.
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/drivers/infiniband/hw/cxgb4/mem.c b/drivers/infiniband/hw/cxgb4/mem.c
index 41b1195..22a2e3e 100644
--- a/drivers/infiniband/hw/cxgb4/mem.c
+++ b/drivers/infiniband/hw/cxgb4/mem.c
@@ -903,7 +903,11 @@
dma_unmap_addr_set(c4pl, mapping, dma_addr);
c4pl->dma_addr = dma_addr;
c4pl->dev = dev;
- c4pl->ibpl.max_page_list_len = pll_len;
+ c4pl->pll_len = pll_len;
+
+ PDBG("%s c4pl %p pll_len %u page_list %p dma_addr %pad\n",
+ __func__, c4pl, c4pl->pll_len, c4pl->ibpl.page_list,
+ &c4pl->dma_addr);
return &c4pl->ibpl;
}
@@ -912,8 +916,12 @@
{
struct c4iw_fr_page_list *c4pl = to_c4iw_fr_page_list(ibpl);
+ PDBG("%s c4pl %p pll_len %u page_list %p dma_addr %pad\n",
+ __func__, c4pl, c4pl->pll_len, c4pl->ibpl.page_list,
+ &c4pl->dma_addr);
+
dma_free_coherent(&c4pl->dev->rdev.lldi.pdev->dev,
- c4pl->ibpl.max_page_list_len,
+ c4pl->pll_len,
c4pl->ibpl.page_list, dma_unmap_addr(c4pl, mapping));
kfree(c4pl);
}