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-rw-r--r--hw/e1000.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/hw/e1000.c b/hw/e1000.c
index 0a4574cf93..2a4d5c726c 100644
--- a/hw/e1000.c
+++ b/hw/e1000.c
@@ -446,7 +446,9 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp)
return;
} else if (dtype == (E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D)) {
// data descriptor
- tp->sum_needed = le32_to_cpu(dp->upper.data) >> 8;
+ if (tp->size == 0) {
+ tp->sum_needed = le32_to_cpu(dp->upper.data) >> 8;
+ }
tp->cptse = ( txd_lower & E1000_TXD_CMD_TSE ) ? 1 : 0;
} else {
// legacy descriptor