e100/e1000*/igb*/ixgb*: Add missing read memory barrier

[deliverable/linux.git] / drivers / net / igbvf / netdev.c

diff --git a/drivers/net/igbvf/netdev.c b/drivers/net/igbvf/netdev.c
index ec808fa8dc213922c1feef96634f76bddca54c9a..c539f7c9c3e08a2957826387fb1ce259954e9015 100644 (file)
--- a/drivers/net/igbvf/netdev.c
+++ b/drivers/net/igbvf/netdev.c
@@ -248,6 +248,7 @@ static bool igbvf_clean_rx_irq(struct igbvf_adapter *adapter,
                if (*work_done >= work_to_do)
                        break;
                (*work_done)++;
+               rmb(); /* read descriptor and rx_buffer_info after status DD */
 
                buffer_info = &rx_ring->buffer_info[i];
 
@@ -780,6 +781,7 @@ static bool igbvf_clean_tx_irq(struct igbvf_ring *tx_ring)
 
        while ((eop_desc->wb.status & cpu_to_le32(E1000_TXD_STAT_DD)) &&
               (count < tx_ring->count)) {
+               rmb();  /* read buffer_info after eop_desc status */
                for (cleaned = false; !cleaned; count++) {
                        tx_desc = IGBVF_TX_DESC_ADV(*tx_ring, i);
                        buffer_info = &tx_ring->buffer_info[i];