[PATCH net-next] liquidio: fix rare pci_driver.probe failure of VF driver

[Felix Manlunas]

From: Prasad Kanneganti <prasad.kannega...@cavium.com>

There's a rare pci_driver.probe failure of the VF driver that's caused by
PF/VF handshake going out of sync.  The culprit is octeon_mbox_write() who
ignores an ack timeout condition; it just keeps unconditionally writing all
elements of mbox_cmd->data[] even when the other side is not ready for
them.  Fix it by making each write of mbox_cmd->data[i] conditional to
having previously received an ack.

Also fix the octeon_mbox_state enum such that each state gets a unique
value.  Also add ULL suffix to numeric literals in macro definitions.

Signed-off-by: Prasad Kanneganti <prasad.kannega...@cavium.com>
Signed-off-by: Felix Manlunas <felix.manlu...@cavium.com>
---
 drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c |  5 ++++-
 drivers/net/ethernet/cavium/liquidio/octeon_mailbox.h | 12 ++++++------
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c 
b/drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c
index 5cca73b..57af7df 100644
--- a/drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c
@@ -178,7 +178,10 @@ int octeon_mbox_write(struct octeon_device *oct,
                                        break;
                                }
                        }
-                       writeq(mbox_cmd->data[i], mbox->mbox_write_reg);
+                       if (ret == OCTEON_MBOX_STATUS_SUCCESS)
+                               writeq(mbox_cmd->data[i], mbox->mbox_write_reg);
+                       else
+                               break;
                }
        }
 
diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_mailbox.h 
b/drivers/net/ethernet/cavium/liquidio/octeon_mailbox.h
index c9376fe..1def22a 100644
--- a/drivers/net/ethernet/cavium/liquidio/octeon_mailbox.h
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_mailbox.h
@@ -20,16 +20,16 @@
 
 /* Macros for Mail Box Communication */
 
-#define OCTEON_MBOX_DATA_MAX   32
+#define OCTEON_MBOX_DATA_MAX           32
 
 #define OCTEON_VF_ACTIVE               0x1
 #define OCTEON_VF_FLR_REQUEST          0x2
 #define OCTEON_PF_CHANGED_VF_MACADDR   0x4
 
 /*Macro for Read acknowldgement*/
-#define OCTEON_PFVFACK                 0xffffffffffffffff
-#define OCTEON_PFVFSIG                 0x1122334455667788
-#define OCTEON_PFVFERR                 0xDEADDEADDEADDEAD
+#define OCTEON_PFVFACK                 0xffffffffffffffffULL
+#define OCTEON_PFVFSIG                 0x1122334455667788ULL
+#define OCTEON_PFVFERR                 0xDEADDEADDEADDEADULL
 
 #define LIO_MBOX_WRITE_WAIT_CNT         1000
 #define LIO_MBOX_WRITE_WAIT_TIME        msecs_to_jiffies(1)
@@ -74,8 +74,8 @@ enum octeon_mbox_state {
        OCTEON_MBOX_STATE_REQUEST_RECEIVED = 4,
        OCTEON_MBOX_STATE_RESPONSE_PENDING = 8,
        OCTEON_MBOX_STATE_RESPONSE_RECEIVING = 16,
-       OCTEON_MBOX_STATE_RESPONSE_RECEIVED = 16,
-       OCTEON_MBOX_STATE_ERROR = 32
+       OCTEON_MBOX_STATE_RESPONSE_RECEIVED = 32,
+       OCTEON_MBOX_STATE_ERROR = 64
 };
 
 struct octeon_mbox {