bnx2x: fix page fault following EEH recovery

[ Upstream commit 7ebe4eda4265642859507d1b3ca330d8c196cfe5 ]

In the last step of the EEH recovery process, the EEH driver calls into
bnx2x_io_resume() to re-initialize the NIC hardware via the function
bnx2x_nic_load().  If an error occurs during bnx2x_nic_load(), OS and
hardware resources are released and an error code is returned to the
caller.  When called from bnx2x_io_resume(), the return code is ignored
and the network interface is brought up unconditionally.  Later attempts
to send a packet via this interface result in a page fault due to a null
pointer reference.

This patch checks the return code of bnx2x_nic_load(), prints an error
message if necessary, and does not enable the interface.

Signed-off-by: David Christensen <drc@linux.vnet.ibm.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index 553f3de93957424fddd2e66c50ff2a30b68cd688..9c26c46771f5e746fc7f331864d381bdf0c8add4 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -14317,11 +14317,16 @@ static void bnx2x_io_resume(struct pci_dev *pdev)
        bp->fw_seq = SHMEM_RD(bp, func_mb[BP_FW_MB_IDX(bp)].drv_mb_header) &
                                                        DRV_MSG_SEQ_NUMBER_MASK;
 
-       if (netif_running(dev))
-               bnx2x_nic_load(bp, LOAD_NORMAL);
+       if (netif_running(dev)) {
+               if (bnx2x_nic_load(bp, LOAD_NORMAL)) {
+                       netdev_err(bp->dev, "Error during driver initialization, try unloading/reloading the driver\n");
+                       goto done;
+               }
+       }
 
        netif_device_attach(dev);
 
+done:
        rtnl_unlock();
 }