bnx2x: Prevent VF race

The mail box containing the Vf-Pf messages is susceptible
to a race - it's possible for 2 flows to try and write commands,
causing one to override the other's message.
Use a mutex to synchronize the access, preventing said race.

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index f6e9d15e3835..10af03e43394 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -12521,7 +12521,8 @@ static int bnx2x_init_one(struct pci_dev *pdev,
          * l2 connections.
          */
         if (IS_VF(bp)) {
-                bnx2x_vf_map_doorbells(bp);
+                bp->doorbells = bnx2x_vf_doorbells(bp);
+                mutex_init(&bp->vf2pf_mutex);
                 rc = bnx2x_vf_pci_alloc(bp);
                 if (rc)
                         goto init_one_exit;