IB/mthca: Fix allocation of ICM chunks in coherent memory

The change to allow allocating ICM chunks from coherent memory did not
increment the count of sg entries properly, so a chunk that required
more than allocation would not be mapped properly by the HCA.

Fix this by adding the missing increment of chunk->nsg.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_memfree.c b/drivers/infiniband/hw/mthca/mthca_memfree.c
index 0b9d053a599d..48f7c65e9aed 100644
--- a/drivers/infiniband/hw/mthca/mthca_memfree.c
+++ b/drivers/infiniband/hw/mthca/mthca_memfree.c
@@ -175,7 +175,9 @@ struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
                 if (!ret) {
                         ++chunk->npages;
 
-                        if (!coherent && chunk->npages == MTHCA_ICM_CHUNK_LEN) {
+                        if (coherent)
+                                ++chunk->nsg;
+                        else if (chunk->npages == MTHCA_ICM_CHUNK_LEN) {
                                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
                                                         chunk->npages,
                                                         PCI_DMA_BIDIRECTIONAL);