1 files changed, 26 insertions, 4 deletions

diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index 3e73d2a523aa..8a708b77925d 100644
--- a/drivers/net/wireless/b43/dma.c
+++ b/drivers/net/wireless/b43/dma.c
@@ -1114,7 +1114,7 @@ static int dma_tx_fragment(struct b43_dmaring *ring,
 {
         const struct b43_dma_ops *ops = ring->ops;
         u8 *header;
-        int slot;
+        int slot, old_top_slot, old_used_slots;
         int err;
         struct b43_dmadesc_generic *desc;
         struct b43_dmadesc_meta *meta;
@@ -1126,6 +1126,9 @@ static int dma_tx_fragment(struct b43_dmaring *ring,
 #define SLOTS_PER_PACKET  2
         B43_WARN_ON(skb_shinfo(skb)->nr_frags);
 
+        old_top_slot = ring->current_slot;
+        old_used_slots = ring->used_slots;
+
         /* Get a slot for the header. */
         slot = request_slot(ring);
         desc = ops->idx2desc(ring, slot, &meta_hdr);
@@ -1133,13 +1136,21 @@ static int dma_tx_fragment(struct b43_dmaring *ring,
 
         header = &(ring->txhdr_cache[slot * hdrsize]);
         cookie = generate_cookie(ring, slot);
-        b43_generate_txhdr(ring->dev, header,
-                           skb->data, skb->len, ctl, cookie);
+        err = b43_generate_txhdr(ring->dev, header,
+                                 skb->data, skb->len, ctl, cookie);
+        if (unlikely(err)) {
+                ring->current_slot = old_top_slot;
+                ring->used_slots = old_used_slots;
+                return err;
+        }
 
         meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header,
                                            hdrsize, 1);
-        if (dma_mapping_error(meta_hdr->dmaaddr))
+        if (dma_mapping_error(meta_hdr->dmaaddr)) {
+                ring->current_slot = old_top_slot;
+                ring->used_slots = old_used_slots;
                 return -EIO;
+        }
         ops->fill_descriptor(ring, desc, meta_hdr->dmaaddr,
                              hdrsize, 1, 0, 0);
 
@@ -1157,6 +1168,8 @@ static int dma_tx_fragment(struct b43_dmaring *ring,
         if (dma_mapping_error(meta->dmaaddr)) {
                 bounce_skb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
                 if (!bounce_skb) {
+                        ring->current_slot = old_top_slot;
+                        ring->used_slots = old_used_slots;
                         err = -ENOMEM;
                         goto out_unmap_hdr;
                 }
@@ -1167,6 +1180,8 @@ static int dma_tx_fragment(struct b43_dmaring *ring,
                 meta->skb = skb;
                 meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
                 if (dma_mapping_error(meta->dmaaddr)) {
+                        ring->current_slot = old_top_slot;
+                        ring->used_slots = old_used_slots;
                         err = -EIO;
                         goto out_free_bounce;
                 }
@@ -1252,6 +1267,13 @@ int b43_dma_tx(struct b43_wldev *dev,
         B43_WARN_ON(ring->stopped);
 
         err = dma_tx_fragment(ring, skb, ctl);
+        if (unlikely(err == -ENOKEY)) {
+                /* Drop this packet, as we don't have the encryption key
+                 * anymore and must not transmit it unencrypted. */
+                dev_kfree_skb_any(skb);
+                err = 0;
+                goto out_unlock;
+        }
         if (unlikely(err)) {
                 b43err(dev->wl, "DMA tx mapping failure\n");
                 goto out_unlock;