sfc: Don't leak PCI DMA maps in the TSO code when the queue fills up

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/sfc/tx.c b/drivers/net/sfc/tx.c
index e5e0bab313eb..0452ea6937ab 100644
--- a/drivers/net/sfc/tx.c
+++ b/drivers/net/sfc/tx.c
@@ -1096,6 +1096,11 @@ static int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
                 efx_stop_queue(tx_queue->efx);
 
  unwind:
+        /* Free the DMA mapping we were in the process of writing out */
+        if (state.ifc.unmap_len)
+                pci_unmap_page(tx_queue->efx->pci_dev, state.ifc.unmap_addr,
+                               state.ifc.unmap_len, PCI_DMA_TODEVICE);
+
         efx_enqueue_unwind(tx_queue);
         return rc2;
 }