From mboxrd@z Thu Jan 1 00:00:00 1970 From: linas@austin.ibm.com (Linas Vepstas) Subject: [PATCH 7/14] Spidernet Cleanup return codes Date: Wed, 13 Dec 2006 15:17:39 -0600 Message-ID: <20061213211739.GG1915@austin.ibm.com> References: <20061213210010.GR4329@austin.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@vger.kernel.org, linuxppc-dev@ozlabs.org, jgarzik@pobox.com, Christoph Hellwig , Ishizaki Kou , Jens Osterkamp , James K Lewis , Arnd Bergmann Return-path: Received: from e35.co.us.ibm.com ([32.97.110.153]:56894 "EHLO e35.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751020AbWLMVS6 (ORCPT ); Wed, 13 Dec 2006 16:18:58 -0500 Received: from d03relay04.boulder.ibm.com (d03relay04.boulder.ibm.com [9.17.195.106]) by e35.co.us.ibm.com (8.13.8/8.12.11) with ESMTP id kBDLIw0e012423 for ; Wed, 13 Dec 2006 16:18:58 -0500 Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by d03relay04.boulder.ibm.com (8.13.6/8.13.6/NCO v8.1.1) with ESMTP id kBDLHfaI166532 for ; Wed, 13 Dec 2006 14:17:41 -0700 Received: from d03av01.boulder.ibm.com (loopback [127.0.0.1]) by d03av01.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id kBDLHeDS010804 for ; Wed, 13 Dec 2006 14:17:41 -0700 To: Andrew Morton Content-Disposition: inline In-Reply-To: <20061213210010.GR4329@austin.ibm.com> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Simplify the somewhat convoluted use of return codes in the rx buffer handling. Signed-off-by: Linas Vepstas Cc: James K Lewis Cc: Arnd Bergmann ---- 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; } /**