net: bgmac: Fix SOF bit checking

commit d2b13233879ca1268a1c027d4573109e5a777811 upstream.

We are checking for the Start of Frame bit in the ctl1 word, while this
bit is set in the ctl0 word instead. Read the ctl0 word and update the
check to verify that.

Fixes: 9cde94506eac ("bgmac: implement scatter/gather support")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index 20356755b708ad68ec800c63883bdcaf36d3faaf..50de83bfcc2efd6a9f4c08acb7ee69442d83edb8 100644 (file)
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -255,15 +255,16 @@ static void bgmac_dma_tx_free(struct bgmac *bgmac, struct bgmac_dma_ring *ring)
        while (ring->start != ring->end) {
                int slot_idx = ring->start % BGMAC_TX_RING_SLOTS;
                struct bgmac_slot_info *slot = &ring->slots[slot_idx];
-               u32 ctl1;
+               u32 ctl0, ctl1;
                int len;
 
                if (slot_idx == empty_slot)
                        break;
 
+               ctl0 = le32_to_cpu(ring->cpu_base[slot_idx].ctl0);
                ctl1 = le32_to_cpu(ring->cpu_base[slot_idx].ctl1);
                len = ctl1 & BGMAC_DESC_CTL1_LEN;
-               if (ctl1 & BGMAC_DESC_CTL0_SOF)
+               if (ctl0 & BGMAC_DESC_CTL0_SOF)
                        /* Unmap no longer used buffer */
                        dma_unmap_single(dma_dev, slot->dma_addr, len,
                                         DMA_TO_DEVICE);