5 files changed, 25 insertions, 25 deletions

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 7e855f9bbd97..b3f67b41627f 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2802,13 +2802,13 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
 dma_error:
         dev_err(&pdev->dev, "TX DMA map failed\n");
         buffer_info->dma = 0;
-        count--;
-
-        while (count >= 0) {
+        if (count)
                 count--;
-                i--;
-                if (i < 0)
+
+        while (count--) {
+                if (i==0)
                         i += tx_ring->count;
+                i--;
                 buffer_info = &tx_ring->buffer_info[i];
                 e1000_unmap_and_free_tx_resource(adapter, buffer_info);
         }
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index c45965a256b6..f91f247ed6af 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -3962,13 +3962,13 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
 dma_error:
         dev_err(&pdev->dev, "TX DMA map failed\n");
         buffer_info->dma = 0;
-        count--;
-
-        while (count >= 0) {
+        if (count)
                 count--;
-                i--;
-                if (i < 0)
+
+        while (count--) {
+                if (i==0)
                         i += tx_ring->count;
+                i--;
                 buffer_info = &tx_ring->buffer_info[i];
                 e1000_put_txbuf(adapter, buffer_info);;
         }
diff --git a/drivers/net/igbvf/netdev.c b/drivers/net/igbvf/netdev.c
index 0dbd0320023a..10e038adba0f 100644
--- a/drivers/net/igbvf/netdev.c
+++ b/drivers/net/igbvf/netdev.c
@@ -2163,14 +2163,14 @@ dma_error:
         buffer_info->length = 0;
         buffer_info->next_to_watch = 0;
         buffer_info->mapped_as_page = false;
-        count--;
+        if (count)
+                count--;
 
         /* clear timestamp and dma mappings for remaining portion of packet */
-        while (count >= 0) {
-                count--;
-                i--;
-                if (i < 0)
+        while (count--) {
+                if (i==0)
                         i += tx_ring->count;
+                i--;
                 buffer_info = &tx_ring->buffer_info[i];
                 igbvf_put_txbuf(adapter, buffer_info);
         }
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index bcd0f01d5feb..593d1a4f217c 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -1363,13 +1363,13 @@ ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
 dma_error:
         dev_err(&pdev->dev, "TX DMA map failed\n");
         buffer_info->dma = 0;
-        count--;
-
-        while (count >= 0) {
+        if (count)
                 count--;
-                i--;
-                if (i < 0)
+
+        while (count--) {
+                if (i==0)
                         i += tx_ring->count;
+                i--;
                 buffer_info = &tx_ring->buffer_info[i];
                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
         }
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 9c9202f40b10..6d61add27a06 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -5167,14 +5167,14 @@ dma_error:
         tx_buffer_info->dma = 0;
         tx_buffer_info->time_stamp = 0;
         tx_buffer_info->next_to_watch = 0;
-        count--;
+        if (count)
+                count--;
 
         /* clear timestamp and dma mappings for remaining portion of packet */
-        while (count >= 0) {
-                count--;
-                i--;
-                if (i < 0)
+        while (count--) {
+                if (i==0)
                         i += tx_ring->count;
+                i--;
                 tx_buffer_info = &tx_ring->tx_buffer_info[i];
                 ixgbe_unmap_and_free_tx_resource(adapter, tx_buffer_info);
         }