[PATCH] ipv6: addrconf: Use normal debugging style

[Joe Perches]

Remove local ADBG macro and use netdev_dbg/pr_debug

Miscellanea:

o Remove unnecessary debug message after allocation failure as there
  already is a dump_stack() on the failure paths
o Leave the allocation failure message on snmp6_alloc_dev as there
  is one code path that does not do a dump_stack()

Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>
---

Remerged resend of http://patchwork.ozlabs.org/patch/826028/
back in October 2017

 net/ipv6/addrconf.c | 28 ++++++++--------------------
 1 file changed, 8 insertions(+), 20 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 6fd4bbdc444f..0d104bd74934 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -94,15 +94,6 @@
 #include <linux/seq_file.h>
 #include <linux/export.h>
 
-/* Set to 3 to get tracing... */
-#define ACONF_DEBUG 2
-
-#if ACONF_DEBUG >= 3
-#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
-#else
-#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
-#endif
-
 #define	INFINITY_LIFE_TIME	0xFFFFFFFF
 
 #define IPV6_MAX_STRLEN \
@@ -409,9 +400,8 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 	dev_hold(dev);
 
 	if (snmp6_alloc_dev(ndev) < 0) {
-		ADBG(KERN_WARNING
-			"%s: cannot allocate memory for statistics; dev=%s.\n",
-			__func__, dev->name);
+		netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
+			   __func__);
 		neigh_parms_release(&nd_tbl, ndev->nd_parms);
 		dev_put(dev);
 		kfree(ndev);
@@ -419,9 +409,8 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 	}
 
 	if (snmp6_register_dev(ndev) < 0) {
-		ADBG(KERN_WARNING
-			"%s: cannot create /proc/net/dev_snmp6/%s\n",
-			__func__, dev->name);
+		netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
+			   __func__, dev->name);
 		goto err_release;
 	}
 
@@ -984,7 +973,7 @@ static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
 
 	/* Ignore adding duplicate addresses on an interface */
 	if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
-		ADBG("ipv6_add_addr: already assigned\n");
+		netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
 		err = -EEXIST;
 	} else {
 		hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
@@ -1044,7 +1033,6 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 
 	ifa = kzalloc(sizeof(*ifa), gfp_flags);
 	if (!ifa) {
-		ADBG("ipv6_add_addr: malloc failed\n");
 		err = -ENOBUFS;
 		goto out;
 	}
@@ -2618,7 +2606,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
 	pinfo = (struct prefix_info *) opt;
 
 	if (len < sizeof(struct prefix_info)) {
-		ADBG("addrconf: prefix option too short\n");
+		netdev_dbg(dev, "addrconf: prefix option too short\n");
 		return;
 	}
 
@@ -4446,8 +4434,8 @@ static void addrconf_verify_rtnl(void)
 	if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
 		next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
 
-	ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
-	      now, next, next_sec, next_sched);
+	pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
+		 now, next, next_sec, next_sched);
 	mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
 	rcu_read_unlock_bh();
 }
-- 
2.15.0