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Message-ID: <20061213211739.GG1915@austin.ibm.com>
Date: Wed, 13 Dec 2006 15:17:39 -0600
From: linas@...tin.ibm.com (Linas Vepstas)
To: Andrew Morton <akpm@...l.org>
Cc: netdev@...r.kernel.org, linuxppc-dev@...abs.org, jgarzik@...ox.com,
Christoph Hellwig <hch@...radead.org>,
Ishizaki Kou <kou.ishizaki@...hiba.co.jp>,
Jens Osterkamp <Jens.Osterkamp@....de>,
James K Lewis <jim@...ewis.com>,
Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 7/14] Spidernet Cleanup return codes
Simplify the somewhat convoluted use of return codes
in the rx buffer handling.
Signed-off-by: Linas Vepstas <linas@...tin.ibm.com>
Cc: James K Lewis <jklewis@...ibm.com>
Cc: Arnd Bergmann <arnd@...db.de>
----
drivers/net/spider_net.c | 32 ++++++++++++--------------------
1 file changed, 12 insertions(+), 20 deletions(-)
Index: linux-2.6.19-git7/drivers/net/spider_net.c
===================================================================
--- linux-2.6.19-git7.orig/drivers/net/spider_net.c 2006-12-13 14:24:20.000000000 -0600
+++ linux-2.6.19-git7/drivers/net/spider_net.c 2006-12-13 14:27:35.000000000 -0600
@@ -911,12 +911,10 @@ spider_net_do_ioctl(struct net_device *n
* @descr: descriptor to process
* @card: card structure
*
- * returns 1 on success, 0 if no packet was passed to the stack
- *
* Fills out skb structure and passes the data to the stack.
* The descriptor state is not changed.
*/
-static int
+static void
spider_net_pass_skb_up(struct spider_net_descr *descr,
struct spider_net_card *card)
{
@@ -961,8 +959,6 @@ spider_net_pass_skb_up(struct spider_net
/* update netdevice statistics */
card->netdev_stats.rx_packets++;
card->netdev_stats.rx_bytes += skb->len;
-
- return 1;
}
/**
@@ -981,7 +977,6 @@ spider_net_decode_one_descr(struct spide
struct spider_net_descr_chain *chain = &card->rx_chain;
struct spider_net_descr *descr = chain->tail;
int status;
- int result;
status = spider_net_get_descr_status(descr);
@@ -999,8 +994,6 @@ spider_net_decode_one_descr(struct spide
/* descriptor definitively used -- move on tail */
chain->tail = descr->next;
- result = 0;
-
/* unmap descriptor */
pci_unmap_single(card->pdev, descr->buf_addr,
SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
@@ -1012,8 +1005,7 @@ spider_net_decode_one_descr(struct spide
pr_err("%s: dropping RX descriptor with state %d\n",
card->netdev->name, status);
card->netdev_stats.rx_dropped++;
- dev_kfree_skb_irq(descr->skb);
- goto refill;
+ goto bad_desc;
}
if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
@@ -1022,8 +1014,7 @@ spider_net_decode_one_descr(struct spide
pr_err("%s: RX descriptor with unkown state %d\n",
card->netdev->name, status);
card->spider_stats.rx_desc_unk_state++;
- dev_kfree_skb_irq(descr->skb);
- goto refill;
+ goto bad_desc;
}
/* The cases we'll throw away the packet immediately */
@@ -1033,17 +1024,18 @@ spider_net_decode_one_descr(struct spide
"data_status=x%08x, data_error=x%08x\n",
card->netdev->name,
descr->data_status, descr->data_error);
- card->spider_stats.rx_desc_error++;
- dev_kfree_skb_irq(descr->skb);
- goto refill;
+ goto bad_desc;
}
- /* ok, we've got a packet in descr */
- result = spider_net_pass_skb_up(descr, card);
-refill:
- /* change the descriptor state: */
+ /* Ok, we've got a packet in descr */
+ spider_net_pass_skb_up(descr, card);
descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
- return result;
+ return 1;
+
+bad_desc:
+ dev_kfree_skb_irq(descr->skb);
+ descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
+ return 0;
}
/**
-
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