tg3: Dont dump DMA error when interface not ready.

This fixes orabug 12981473.

When do testing with BCM5704 Gigabit Ethernet, bootup get below warning:

tg3 0000:03:01.0: eth0: DMA Status error.  Resetting chip.
<Registers state of device>
tg3 0000:03:01.0: eth0: 0: Host status block [00000007:00000002:(0000:0000:0000):(0000:0000)]
tg3 0000:03:01.0: eth0: 0: NAPI info [00000001:00000002:(0000:0000:01ff):0000:(00c8:0000:0000:0000)]
tg3 0000:03:01.0: eth0: Link is up at 1000 Mbps, full duplex
tg3 0000:03:01.0: eth0: Flow control is on for TX and on for RX
tg3 0000:03:01.0: tg3_stop_block timed out, ofs=4800 enable_bit=2
tg3 0000:03:01.0: eth0: Link is down
tg3 0000:03:01.0: eth0: Link is up at 1000 Mbps, full duplex
tg3 0000:03:01.0: eth0: Flow control is on for TX and on for RX

We need not to check the status and dump registers status if the device
not ready,

Signed-off-by: Joe Jin <joe.jin@oracle.com>
Reported-by: Gurudas Pai <gurudas.pai@oracle.com>

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index a1f9f9eef37d3b04b8d1344c964eec0a57c56eb2..c0d6bf4a1f69aac74a261cb86af7f6be96c7a5ff 100644 (file)
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -5300,10 +5300,15 @@ static void tg3_process_error(struct tg3 *tp)
 {
        u32 val;
        bool real_error = false;
+       bool dump = true;
 
        if (tg3_flag(tp, ERROR_PROCESSED))
                return;
 
+       /* If interface not ready then dont dump error */
+       if (!netif_carrier_ok(tp->dev))
+               dump = false;
+
        /* Check Flow Attention register */
        val = tr32(HOSTCC_FLOW_ATTN);
        if (val & ~HOSTCC_FLOW_ATTN_MBUF_LWM) {
@@ -5317,14 +5322,16 @@ static void tg3_process_error(struct tg3 *tp)
        }
 
        if (tr32(RDMAC_STATUS) || tr32(WDMAC_STATUS)) {
-               netdev_err(tp->dev, "DMA Status error.  Resetting chip.\n");
+               if (dump)
+                       netdev_err(tp->dev, "DMA Status error.  Resetting chip.\n");
                real_error = true;
        }
 
        if (!real_error)
                return;
 
-       tg3_dump_state(tp);
+       if (dump)
+               tg3_dump_state(tp);
 
        tg3_flag_set(tp, ERROR_PROCESSED);
        schedule_work(&tp->reset_task);