bnx2x: Protect code with NOMCP

Don't run code that can't be run if MCP is not present.
This will prevent NULL pointer dereferencing.

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

1 files changed, 32 insertions, 12 deletions

diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c
index 3325592e5dab..22fbc4a1b368 100644
--- a/drivers/net/bnx2x_main.c
+++ b/drivers/net/bnx2x_main.c
@@ -513,6 +513,10 @@ static void bnx2x_fw_dump(struct bnx2x *bp)
         __be32 data[9];
         int word;
 
+        if (BP_NOMCP(bp)) {
+                BNX2X_ERR("NO MCP - can not dump\n");
+                return;
+        }
         mark = REG_RD(bp, MCP_REG_MCPR_SCRATCH + 0xf104);
         mark = ((mark + 0x3) & ~0x3);
         pr_err("begin fw dump (mark 0x%x)\n", mark);
@@ -2292,11 +2296,14 @@ static void bnx2x__link_reset(struct bnx2x *bp)
 
 static u8 bnx2x_link_test(struct bnx2x *bp)
 {
-        u8 rc;
+        u8 rc = 0;
 
-        bnx2x_acquire_phy_lock(bp);
-        rc = bnx2x_test_link(&bp->link_params, &bp->link_vars);
-        bnx2x_release_phy_lock(bp);
+        if (!BP_NOMCP(bp)) {
+                bnx2x_acquire_phy_lock(bp);
+                rc = bnx2x_test_link(&bp->link_params, &bp->link_vars);
+                bnx2x_release_phy_lock(bp);
+        } else
+                BNX2X_ERR("Bootcode is missing - can not test link\n");
 
         return rc;
 }
@@ -4288,7 +4295,6 @@ static int bnx2x_hw_stats_update(struct bnx2x *bp)
                 u32 lo;
                 u32 hi;
         } diff;
-        u32 nig_timer_max;
 
         if (bp->link_vars.mac_type == MAC_TYPE_BMAC)
                 bnx2x_bmac_stats_update(bp);
@@ -4319,10 +4325,14 @@ static int bnx2x_hw_stats_update(struct bnx2x *bp)
 
         pstats->host_port_stats_start = ++pstats->host_port_stats_end;
 
-        nig_timer_max = SHMEM_RD(bp, port_mb[BP_PORT(bp)].stat_nig_timer);
-        if (nig_timer_max != estats->nig_timer_max) {
-                estats->nig_timer_max = nig_timer_max;
-                BNX2X_ERR("NIG timer max (%u)\n", estats->nig_timer_max);
+        if (!BP_NOMCP(bp)) {
+                u32 nig_timer_max =
+                        SHMEM_RD(bp, port_mb[BP_PORT(bp)].stat_nig_timer);
+                if (nig_timer_max != estats->nig_timer_max) {
+                        estats->nig_timer_max = nig_timer_max;
+                        BNX2X_ERR("NIG timer max (%u)\n",
+                                  estats->nig_timer_max);
+                }
         }
 
         return 0;
@@ -6377,10 +6387,14 @@ static void bnx2x_init_pxp(struct bnx2x *bp)
 
 static void bnx2x_setup_fan_failure_detection(struct bnx2x *bp)
 {
+        int is_required;
         u32 val;
-        u8 port;
-        u8 is_required = 0;
+        int port;
 
+        if (BP_NOMCP(bp))
+                return;
+
+        is_required = 0;
         val = SHMEM_RD(bp, dev_info.shared_hw_config.config2) &
               SHARED_HW_CFG_FAN_FAILURE_MASK;
 
@@ -9688,7 +9702,7 @@ static int __devinit bnx2x_get_hwinfo(struct bnx2x *bp)
 
         bp->e1hov = 0;
         bp->e1hmf = 0;
-        if (CHIP_IS_E1H(bp)) {
+        if (CHIP_IS_E1H(bp) && !BP_NOMCP(bp)) {
                 bp->mf_config =
                         SHMEM_RD(bp, mf_cfg.func_mf_config[func].config);
 
@@ -11293,6 +11307,9 @@ static int bnx2x_test_loopback(struct bnx2x *bp, u8 link_up)
 {
         int rc = 0, res;
 
+        if (BP_NOMCP(bp))
+                return rc;
+
         if (!netif_running(bp->dev))
                 return BNX2X_LOOPBACK_FAILED;
 
@@ -11340,6 +11357,9 @@ static int bnx2x_test_nvram(struct bnx2x *bp)
         int i, rc;
         u32 magic, crc;
 
+        if (BP_NOMCP(bp))
+                return 0;
+
         rc = bnx2x_nvram_read(bp, 0, data, 4);
         if (rc) {
                 DP(NETIF_MSG_PROBE, "magic value read (rc %d)\n", rc);