Spidernet Remove unused variable

Remove unused variable; this makes code easier to read.
Tweak commentary.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Cc: James K Lewis <jklewis@us.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index f587412..96a7e77 100644 (file)
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -367,21 +367,20 @@ spider_net_free_rx_chain_contents(struct spider_net_card *card)
 }
 
 /**
- * spider_net_prepare_rx_descr - reinitializes a rx descriptor
+ * spider_net_prepare_rx_descr - Reinitialize RX descriptor
  * @card: card structure
  * @descr: descriptor to re-init
  *
- * return 0 on succes, <0 on failure
+ * Return 0 on succes, <0 on failure.
  *
- * allocates a new rx skb, iommu-maps it and attaches it to the descriptor.
- * Activate the descriptor state-wise
+ * Allocates a new rx skb, iommu-maps it and attaches it to the
+ * descriptor. Mark the descriptor as activated, ready-to-use.
  */
 static int
 spider_net_prepare_rx_descr(struct spider_net_card *card,
                            struct spider_net_descr *descr)
 {
        dma_addr_t buf;
-       int error = 0;
        int offset;
        int bufsize;
 
@@ -409,7 +408,7 @@ spider_net_prepare_rx_descr(struct spider_net_card *card,
                (SPIDER_NET_RXBUF_ALIGN - 1);
        if (offset)
                skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset);
-       /* io-mmu-map the skb */
+       /* iommu-map the skb */
        buf = pci_map_single(card->pdev, descr->skb->data,
                        SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
        descr->buf_addr = buf;
@@ -424,7 +423,7 @@ spider_net_prepare_rx_descr(struct spider_net_card *card,
                                         SPIDER_NET_DMAC_NOINTR_COMPLETE;
        }
 
-       return error;
+       return 0;
 }
 
 /**