[BNX2]: Fix link change handling

Fix some link-related problems by doing a coalesce_now after link
change interrupt to flush out the transient link status.

To facilitate this, the host coalesce cmd register value is cached in
the device structure.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 18 insertions, 12 deletions

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index 7d213707008a..c56888e66351 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -313,8 +313,6 @@ bnx2_disable_int(struct bnx2 *bp)
 static void
 bnx2_enable_int(struct bnx2 *bp)
 {
-        u32 val;
-
         REG_WR(bp, BNX2_PCICFG_INT_ACK_CMD,
                BNX2_PCICFG_INT_ACK_CMD_INDEX_VALID |
                BNX2_PCICFG_INT_ACK_CMD_MASK_INT | bp->last_status_idx);
@@ -322,8 +320,7 @@ bnx2_enable_int(struct bnx2 *bp)
         REG_WR(bp, BNX2_PCICFG_INT_ACK_CMD,
                BNX2_PCICFG_INT_ACK_CMD_INDEX_VALID | bp->last_status_idx);
 
-        val = REG_RD(bp, BNX2_HC_COMMAND);
-        REG_WR(bp, BNX2_HC_COMMAND, val | BNX2_HC_COMMAND_COAL_NOW);
+        REG_WR(bp, BNX2_HC_COMMAND, bp->hc_cmd | BNX2_HC_COMMAND_COAL_NOW);
 }
 
 static void
@@ -1926,6 +1923,13 @@ bnx2_poll(struct net_device *dev, int *budget)
                 spin_lock(&bp->phy_lock);
                 bnx2_phy_int(bp);
                 spin_unlock(&bp->phy_lock);
+
+                /* This is needed to take care of transient status
+                 * during link changes.
+                 */
+                REG_WR(bp, BNX2_HC_COMMAND,
+                       bp->hc_cmd | BNX2_HC_COMMAND_COAL_NOW_WO_INT);
+                REG_RD(bp, BNX2_HC_COMMAND);
         }
 
         if (bp->status_blk->status_tx_quick_consumer_index0 != bp->hw_tx_cons)
@@ -3307,6 +3311,8 @@ bnx2_init_chip(struct bnx2 *bp)
 
         udelay(20);
 
+        bp->hc_cmd = REG_RD(bp, BNX2_HC_COMMAND);
+
         return rc;
 }
 
@@ -3746,7 +3752,6 @@ bnx2_run_loopback(struct bnx2 *bp, int loopback_mode)
         struct sk_buff *skb, *rx_skb;
         unsigned char *packet;
         u16 rx_start_idx, rx_idx;
-        u32 val;
         dma_addr_t map;
         struct tx_bd *txbd;
         struct sw_bd *rx_buf;
@@ -3777,8 +3782,9 @@ bnx2_run_loopback(struct bnx2 *bp, int loopback_mode)
         map = pci_map_single(bp->pdev, skb->data, pkt_size,
                 PCI_DMA_TODEVICE);
 
-        val = REG_RD(bp, BNX2_HC_COMMAND);
-        REG_WR(bp, BNX2_HC_COMMAND, val | BNX2_HC_COMMAND_COAL_NOW_WO_INT);
+        REG_WR(bp, BNX2_HC_COMMAND,
+               bp->hc_cmd | BNX2_HC_COMMAND_COAL_NOW_WO_INT);
+
         REG_RD(bp, BNX2_HC_COMMAND);
 
         udelay(5);
@@ -3802,8 +3808,9 @@ bnx2_run_loopback(struct bnx2 *bp, int loopback_mode)
 
         udelay(100);
 
-        val = REG_RD(bp, BNX2_HC_COMMAND);
-        REG_WR(bp, BNX2_HC_COMMAND, val | BNX2_HC_COMMAND_COAL_NOW_WO_INT);
+        REG_WR(bp, BNX2_HC_COMMAND,
+               bp->hc_cmd | BNX2_HC_COMMAND_COAL_NOW_WO_INT);
+
         REG_RD(bp, BNX2_HC_COMMAND);
 
         udelay(5);
@@ -3939,7 +3946,6 @@ static int
 bnx2_test_intr(struct bnx2 *bp)
 {
         int i;
-        u32 val;
         u16 status_idx;
 
         if (!netif_running(bp->dev))
@@ -3948,8 +3954,7 @@ bnx2_test_intr(struct bnx2 *bp)
         status_idx = REG_RD(bp, BNX2_PCICFG_INT_ACK_CMD) & 0xffff;
 
         /* This register is not touched during run-time. */
-        val = REG_RD(bp, BNX2_HC_COMMAND);
-        REG_WR(bp, BNX2_HC_COMMAND, val | BNX2_HC_COMMAND_COAL_NOW);
+        REG_WR(bp, BNX2_HC_COMMAND, bp->hc_cmd | BNX2_HC_COMMAND_COAL_NOW);
         REG_RD(bp, BNX2_HC_COMMAND);
 
         for (i = 0; i < 10; i++) {
diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index fd4b7f2eb477..18bc0919cc9e 100644
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -4038,6 +4038,7 @@ struct bnx2 {
         struct statistics_block *stats_blk;
         dma_addr_t              stats_blk_mapping;
 
+        u32                     hc_cmd;
         u32                     rx_mode;
 
         u16                     req_line_speed;