From: Steve Wise <sw...@opengridcomputing.com>
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 map debugging enabled in the kernel. The fix is
to save the length in the c4iw_fr_page_list struct.
Signed-off-by: Steve Wise <sw...@opengridcomputing.com>
---
drivers/infiniband/hw/cxgb4/iw_cxgb4.h | 1 +
drivers/infiniband/hw/cxgb4/mem.c | 12 ++++++++++--
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
index 8c32088..b75f8f5 100644
--- a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
+++ b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
@@ -375,6 +375,7 @@ struct c4iw_fr_page_list {
DEFINE_DMA_UNMAP_ADDR(mapping);
dma_addr_t dma_addr;
struct c4iw_dev *dev;
+ int pll_len;
};
static inline struct c4iw_fr_page_list *to_c4iw_fr_page_list(
diff --git a/drivers/infiniband/hw/cxgb4/mem.c
b/drivers/infiniband/hw/cxgb4/mem.c
index 41b1195..cdaf257 100644
--- a/drivers/infiniband/hw/cxgb4/mem.c
+++ b/drivers/infiniband/hw/cxgb4/mem.c
@@ -903,7 +903,11 @@ struct ib_fast_reg_page_list
*c4iw_alloc_fastreg_pbl(struct ib_device *device,
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 %p\n",
+ __func__, c4pl, c4pl->pll_len, c4pl->ibpl.page_list,
+ (void *)c4pl->dma_addr);
return &c4pl->ibpl;
}
@@ -912,8 +916,12 @@ void c4iw_free_fastreg_pbl(struct ib_fast_reg_page_list
*ibpl)
{
struct c4iw_fr_page_list *c4pl = to_c4iw_fr_page_list(ibpl);
+ PDBG("%s c4pl %p pll_len %u page_list %p dma_addr %p\n",
+ __func__, c4pl, c4pl->pll_len, c4pl->ibpl.page_list,
+ (void *)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);
}
--
1.8.4
--
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