wil6210: fix error path in wil_tx_vring

Release fragments in the order of allocation; including one for skb head

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/net/wireless/ath/wil6210/txrx.c b/drivers/net/wireless/ath/wil6210/txrx.c
index 2a9d56a5fd0c..e563af13740b 100644
--- a/drivers/net/wireless/ath/wil6210/txrx.c
+++ b/drivers/net/wireless/ath/wil6210/txrx.c
@@ -730,12 +730,13 @@ static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
         return 0;
  dma_error:
         /* unmap what we have mapped */
-        /* Note: increment @f to operate with positive index */
-        for (f++; f > 0; f--) {
+        nr_frags = f + 1; /* frags mapped + one for skb head */
+        for (f = 0; f < nr_frags; f++) {
                 u16 dmalen;
-                struct wil_ctx *ctx = &vring->ctx[i];
+                struct wil_ctx *ctx;
 
                 i = (swhead + f) % vring->size;
+                ctx = &vring->ctx[i];
                 _d = &(vring->va[i].tx);
                 *d = *_d;
                 _d->dma.status = TX_DMA_STATUS_DU;