[BNX2X]: fix MSI-X/INT#A errata

Errata A0.158 workaround. 

Running in INT#A mode after running with MSI-X fails due to a PCI core
bug.

Signed-off-by: Eliezer Tamir <eliezert@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2x.c

@@ -443,7 +443,7 @@ static void bnx2x_panic_dump(struct bnx2x *bp)
 	DP(BNX2X_MSG_STATS, "stats_state - DISABLE\n");
 }
 
-static void bnx2x_enable_int(struct bnx2x *bp)
+static void bnx2x_int_enable(struct bnx2x *bp)
 {
 	int port = bp->port;
 	u32 addr = port ? HC_REG_CONFIG_1 : HC_REG_CONFIG_0;
@@ -456,18 +456,26 @@ static void bnx2x_enable_int(struct bnx2x *bp)
 			HC_CONFIG_0_REG_ATTN_BIT_EN_0);
 	} else {
 		val |= (HC_CONFIG_0_REG_SINGLE_ISR_EN_0 |
+			HC_CONFIG_0_REG_MSI_MSIX_INT_EN_0 |
 			HC_CONFIG_0_REG_INT_LINE_EN_0 |
 			HC_CONFIG_0_REG_ATTN_BIT_EN_0);
+
+		/* Errata A0.158 workaround */
+		DP(NETIF_MSG_INTR, "write %x to HC %d (addr 0x%x)  MSI-X %d\n",
+		   val, port, addr, msix);
+
+		REG_WR(bp, addr, val);
+
 		val &= ~HC_CONFIG_0_REG_MSI_MSIX_INT_EN_0;
 	}
 
-	DP(NETIF_MSG_INTR, "write %x to HC %d (addr 0x%x)  msi %d\n",
+	DP(NETIF_MSG_INTR, "write %x to HC %d (addr 0x%x)  MSI-X %d\n",
 	   val, port, addr, msix);
 
 	REG_WR(bp, addr, val);
 }
 
-static void bnx2x_disable_int(struct bnx2x *bp)
+static void bnx2x_int_disable(struct bnx2x *bp)
 {
 	int port = bp->port;
 	u32 addr = port ? HC_REG_CONFIG_1 : HC_REG_CONFIG_0;
@@ -486,15 +494,15 @@ static void bnx2x_disable_int(struct bnx2x *bp)
 		BNX2X_ERR("BUG! proper val not read from IGU!\n");
 }
 
-static void bnx2x_disable_int_sync(struct bnx2x *bp)
+static void bnx2x_int_disable_sync(struct bnx2x *bp)
 {
 
 	int msix = (bp->flags & USING_MSIX_FLAG) ? 1 : 0;
 	int i;
 
 	atomic_inc(&bp->intr_sem);
 	/* prevent the HW from sending interrupts */
-	bnx2x_disable_int(bp);
+	bnx2x_int_disable(bp);
 
 	/* make sure all ISRs are done */
 	if (msix) {
@@ -5710,7 +5718,7 @@ static void bnx2x_nic_init(struct bnx2x *bp)
 	bnx2x_init_internal(bp);
 	bnx2x_init_stats(bp);
 	bnx2x_init_ind_table(bp);
-	bnx2x_enable_int(bp);
+	bnx2x_int_enable(bp);
 
 }
 
@@ -7154,7 +7162,7 @@ static int bnx2x_nic_load(struct bnx2x *bp, int req_irq)
 		napi_disable(&bnx2x_fp(bp, i, napi));
 
 int_disable:
-	bnx2x_disable_int_sync(bp);
+	bnx2x_int_disable_sync(bp);
 
 	bnx2x_free_skbs(bp);
 	bnx2x_free_irq(bp);
@@ -7174,7 +7182,7 @@ static void bnx2x_netif_stop(struct bnx2x *bp)
 	bp->rx_mode = BNX2X_RX_MODE_NONE;
 	bnx2x_set_storm_rx_mode(bp);
 
-	bnx2x_disable_int_sync(bp);
+	bnx2x_int_disable_sync(bp);
 	bnx2x_link_reset(bp);
 
 	for_each_queue(bp, i)