[IPV6]: Cleanup of net/ipv6/reassambly.c

Two minor cleanups:

1. Using kzalloc() in fraq_alloc_queue()
   saves the memset() in ipv6_frag_create().

2. Invert sense of if-statements to streamline code.
   Inverts the comment, too.

Signed-off-by: Ingo Oeser <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Ingo Oeser

net/ipv6/reassembly.c

@@ -203,7 +203,7 @@ static inline void frag_free_queue(struct frag_queue *fq, int *work)
 
 static inline struct frag_queue *frag_alloc_queue(void)
 {
-	struct frag_queue *fq = kmalloc(sizeof(struct frag_queue), GFP_ATOMIC);
+	struct frag_queue *fq = kzalloc(sizeof(struct frag_queue), GFP_ATOMIC);
 
 	if(!fq)
 		return NULL;
@@ -288,6 +288,7 @@ static void ip6_evictor(void)
 static void ip6_frag_expire(unsigned long data)
 {
 	struct frag_queue *fq = (struct frag_queue *) data;
+	struct net_device *dev;
 
 	spin_lock(&fq->lock);
 
@@ -299,22 +300,22 @@ static void ip6_frag_expire(unsigned long data)
 	IP6_INC_STATS_BH(IPSTATS_MIB_REASMTIMEOUT);
 	IP6_INC_STATS_BH(IPSTATS_MIB_REASMFAILS);
 
-	/* Send error only if the first segment arrived. */
-	if (fq->last_in&FIRST_IN && fq->fragments) {
-		struct net_device *dev = dev_get_by_index(fq->iif);
+	/* Don't send error if the first segment did not arrive. */
+	if (!(fq->last_in&FIRST_IN) || !fq->fragments)
+		goto out;
 
-		/*
-		   But use as source device on which LAST ARRIVED
-		   segment was received. And do not use fq->dev
-		   pointer directly, device might already disappeared.
-		 */
-		if (dev) {
-			fq->fragments->dev = dev;
-			icmpv6_send(fq->fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0,
-				    dev);
-			dev_put(dev);
-		}
-	}
+	dev = dev_get_by_index(fq->iif);
+	if (!dev)
+		goto out;
+
+	/*
+	   But use as source device on which LAST ARRIVED
+	   segment was received. And do not use fq->dev
+	   pointer directly, device might already disappeared.
+	 */
+	fq->fragments->dev = dev;
+	icmpv6_send(fq->fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0, dev);
+	dev_put(dev);
 out:
 	spin_unlock(&fq->lock);
 	fq_put(fq, NULL);
@@ -368,8 +369,6 @@ ip6_frag_create(unsigned int hash, u32 id, struct in6_addr *src, struct in6_addr
 	if ((fq = frag_alloc_queue()) == NULL)
 		goto oom;
 
-	memset(fq, 0, sizeof(struct frag_queue));
-
 	fq->id = id;
 	ipv6_addr_copy(&fq->saddr, src);
 	ipv6_addr_copy(&fq->daddr, dst);