netdev - [PATCH 9/16] Spidernet Merge error branches

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Message-ID: <20061206234006.GI4649@austin.ibm.com>
Date:	Wed, 6 Dec 2006 17:40:06 -0600
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Andrew Morton <akpm@...l.org>
Cc:	jgarzik@...ox.com, netdev@...r.kernel.org, linuxppc-dev@...abs.org,
	James K Lewis <jklewis@...ibm.com>,
	Arnd Bergmann <arnd@...db.de>,
	Geoff Levand <geoffrey.levand@...sony.com>
Subject: [PATCH 9/16] Spidernet Merge error branches


Two distinct if() statements have the ame body. Merge the clauses.
Also clean up punctuation, capitalization, etc.

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 |   28 ++++++++++++----------------
 1 file changed, 12 insertions(+), 16 deletions(-)

Index: linux-2.6.19-git7/drivers/net/spider_net.c
===================================================================
--- linux-2.6.19-git7.orig/drivers/net/spider_net.c	2006-12-06 16:03:08.000000000 -0600
+++ linux-2.6.19-git7/drivers/net/spider_net.c	2006-12-06 16:03:09.000000000 -0600
@@ -936,15 +936,16 @@ spider_net_pass_skb_up(struct spider_net
 }
 
 /**
- * spider_net_decode_one_descr - processes an rx descriptor
+ * spider_net_decode_one_descr - Processes an RX descriptor
  * @card: card structure
  * @napi: whether caller is in NAPI context
  *
- * returns 1 if a packet has been sent to the stack, otherwise 0
+ * Returns 1 if a packet has been sent to the stack, otherwise 0.
  *
- * processes an rx descriptor by iommu-unmapping the data buffer and passing
- * the packet up to the stack. This function is called in softirq
- * context, e.g. either bottom half from interrupt or NAPI polling context
+ * Processes an RX descriptor by iommu-unmapping the data buffer
+ * and passing the packet up to the stack. This function is called
+ * in a softirq context, e.g. either bottom half from interrupt or
+ * NAPI polling context.
  */
 static int
 spider_net_decode_one_descr(struct spider_net_card *card, int napi)
@@ -959,23 +960,18 @@ spider_net_decode_one_descr(struct spide
 
 	status = spider_net_get_descr_status(descr);
 
-	if (status == SPIDER_NET_DESCR_CARDOWNED) {
-		/* nothing in the descriptor yet */
+	/* Nothing in the descriptor yet, or ring is empty */
+	if ( (status == SPIDER_NET_DESCR_CARDOWNED) ||
+	     (status == SPIDER_NET_DESCR_NOT_IN_USE) ) {
 		spin_unlock_irqrestore(&chain->lock, flags);
 		return 0;
 	}
 
-	if (status == SPIDER_NET_DESCR_NOT_IN_USE) {
-		/* not initialized yet, the ring must be empty */
-		spin_unlock_irqrestore(&chain->lock, flags);
-		return 0;
-	}
-
-	/* descriptor definitively used -- move on tail */
+	/* Descriptor definitively used -- move on tail. */
 	chain->tail = descr->next;
 	spin_unlock_irqrestore(&chain->lock, flags);
 
-	/* unmap descriptor */
+	/* Unmap descriptor. */
 	pci_unmap_single(card->pdev, descr->buf_addr,
 			SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
 
@@ -998,7 +994,7 @@ spider_net_decode_one_descr(struct spide
 		goto bad_desc;
 	}
 
-	/* The cases we'll throw away the packet immediately */
+	/* The cases we'll throw away the packet immediately. */
 	if (descr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
 		if (netif_msg_rx_err(card))
 			pr_err("%s: error in received descriptor found, "
-
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