[PATCH net-next 4/6] tsnep: Fix tsnep_tx_unmap() error path usage

[Gerhard Engleder <gerhard@engleder-embedded.com>]

If tsnep_tx_map() fails, then tsnep_tx_unmap() shall start at the write
index like tsnep_tx_map(). This is different to the normal operation.
Thus, add an additional parameter to tsnep_tx_unmap() to enable start at
different positions for successful TX and failed TX.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
---
 drivers/net/ethernet/engleder/tsnep_main.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
index 3cae485e8689..9f8ca6d9a010 100644
--- a/drivers/net/ethernet/engleder/tsnep_main.c
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -364,7 +364,7 @@ static int tsnep_tx_map(struct sk_buff *skb, struct tsnep_tx *tx, int count)
 	return map_len;
 }
 
-static int tsnep_tx_unmap(struct tsnep_tx *tx, int count)
+static int tsnep_tx_unmap(struct tsnep_tx *tx, int index, int count)
 {
 	struct device *dmadev = tx->adapter->dmadev;
 	struct tsnep_tx_entry *entry;
@@ -372,7 +372,7 @@ static int tsnep_tx_unmap(struct tsnep_tx *tx, int count)
 	int i;
 
 	for (i = 0; i < count; i++) {
-		entry = &tx->entry[(tx->read + i) % TSNEP_RING_SIZE];
+		entry = &tx->entry[(index + i) % TSNEP_RING_SIZE];
 
 		if (entry->len) {
 			if (i == 0)
@@ -424,7 +424,7 @@ static netdev_tx_t tsnep_xmit_frame_ring(struct sk_buff *skb,
 
 	retval = tsnep_tx_map(skb, tx, count);
 	if (retval < 0) {
-		tsnep_tx_unmap(tx, count);
+		tsnep_tx_unmap(tx, tx->write, count);
 		dev_kfree_skb_any(entry->skb);
 		entry->skb = NULL;
 
@@ -492,7 +492,7 @@ static bool tsnep_tx_poll(struct tsnep_tx *tx, int napi_budget)
 		if (skb_shinfo(entry->skb)->nr_frags > 0)
 			count += skb_shinfo(entry->skb)->nr_frags;
 
-		length = tsnep_tx_unmap(tx, count);
+		length = tsnep_tx_unmap(tx, tx->read, count);
 
 		if ((skb_shinfo(entry->skb)->tx_flags & SKBTX_IN_PROGRESS) &&
 		    (__le32_to_cpu(entry->desc_wb->properties) &
-- 
2.30.2