bnx2x: Adding FW mailbox mutex

DCC commands are not protected with the RTNL lock, so a mutex should be added

Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 8 insertions, 2 deletions

diff --git a/drivers/net/bnx2x.h b/drivers/net/bnx2x.h
index 185a6bab2227..c3b32f71e024 100644
--- a/drivers/net/bnx2x.h
+++ b/drivers/net/bnx2x.h
@@ -1023,6 +1023,9 @@ struct bnx2x {
         /* used to synchronize dmae accesses */
         struct mutex            dmae_mutex;
 
+        /* used to protect the FW mail box */
+        struct mutex            fw_mb_mutex;
+
         /* used to synchronize stats collecting */
         int                     stats_state;
         /* used by dmae command loader */
diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c
index e7b3b27d16b6..7c5c3000bbb4 100644
--- a/drivers/net/bnx2x_main.c
+++ b/drivers/net/bnx2x_main.c
@@ -2528,6 +2528,7 @@ u32 bnx2x_fw_command(struct bnx2x *bp, u32 command)
         u32 cnt = 1;
         u8 delay = CHIP_REV_IS_SLOW(bp) ? 100 : 10;
 
+        mutex_lock(&bp->fw_mb_mutex);
         SHMEM_WR(bp, func_mb[func].drv_mb_header, (command | seq));
         DP(BNX2X_MSG_MCP, "wrote command (%x) to FW MB\n", (command | seq));
 
@@ -2537,8 +2538,8 @@ u32 bnx2x_fw_command(struct bnx2x *bp, u32 command)
 
                 rc = SHMEM_RD(bp, func_mb[func].fw_mb_header);
 
-                /* Give the FW up to 2 second (200*10ms) */
-        } while ((seq != (rc & FW_MSG_SEQ_NUMBER_MASK)) && (cnt++ < 200));
+                /* Give the FW up to 5 second (500*10ms) */
+        } while ((seq != (rc & FW_MSG_SEQ_NUMBER_MASK)) && (cnt++ < 500));
 
         DP(BNX2X_MSG_MCP, "[after %d ms] read (%x) seq is (%x) from FW MB\n",
            cnt*delay, rc, seq);
@@ -2552,6 +2553,7 @@ u32 bnx2x_fw_command(struct bnx2x *bp, u32 command)
                 bnx2x_fw_dump(bp);
                 rc = 0;
         }
+        mutex_unlock(&bp->fw_mb_mutex);
 
         return rc;
 }
@@ -8956,6 +8958,7 @@ static int __devinit bnx2x_init_bp(struct bnx2x *bp)
         smp_wmb(); /* Ensure that bp->intr_sem update is SMP-safe */
 
         mutex_init(&bp->port.phy_mutex);
+        mutex_init(&bp->fw_mb_mutex);
 #ifdef BCM_CNIC
         mutex_init(&bp->cnic_mutex);
 #endif