regmap: A couple of small fixes for 3.4

Two more small fixes:
 - Now we have users for it that aren't running Android it turns out that
   regcache_sync_region() is much more useful to drivers if it's exported
   for use by modules.  Who knew?
 - Make sure we don't divide by zero when doing debugfs dumps of rbtrees,
   not visible up until now because everything was providing at least
   some cache on startup.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.11 (GNU/Linux)
 
 iQIcBAABAgAGBQJPfMvJAAoJEBus8iNuMP3d43YQAI8IJqPoAqK2eKjQlYNRzP3O
 hWgA6oU56Yqg0PZKKTbWKkul2j9onRV7UrCsXrKo9gCVFNAROkMh9q8uZxzf7yl1
 AlOsoKDH/ijYhuAkbLri5tWc8vw5SZS/rSXx6BnVAIPgDjaCEoJcd6swJTfieuyz
 slN+y3Y3FDk7zIefkcAlMpUR5ks+jAHOHhk/Kwe5+xP3xk/09acuiNogpPYRH4Fp
 2tV9Qr9cSrDKIX8eLkR/AkRkmESMIzkpEopQY4vpYO+GiEwyKGdGjMTqkgjQ7PSk
 jL1lp36CAeVuR7Bp3OFT7bilXZKTrkOiwkC2ctFmyjYK+VO4HWBeOeMmoZvTBRCO
 +RXAZVN0zFyxPuH6ZJqOuQpCyoY0JBZPZulwRrXGsQpQOoITuEt9yJpLfDSj6hYd
 Pj8NLHT10n8DBnLk8nXuxT0mNgGDBTNOVCpVblmfm2CLcEGOQsAzWCgCKjkehCUJ
 O3I/3ZHzs1tvCZNcmt5HH8d8D+iMtkOS8bSHTHvZ2ADjSXWGPgXYlUwObYH6kV9N
 nMYi8Q6r8skkESL1jaE12XMZxGm07emIyUh+9hfM0lLGEC/cPff2gXwKhtZMDQfE
 XELx3e/EbyqNsNqFd71v9XpGyJA9si7JvPY/ZSei/CTqToIEAsX/BwGMKGAWnrNy
 ARlp9oaM6BOOg+i2Ddrg
 =qm1Q
 -----END PGP SIGNATURE-----

Merge tag 'regmap-3.4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull two more small regmap fixes from Mark Brown:
 - Now we have users for it that aren't running Android it turns out
   that regcache_sync_region() is much more useful to drivers if it's
   exported for use by modules.  Who knew?
 - Make sure we don't divide by zero when doing debugfs dumps of
   rbtrees, not visible up until now because everything was providing at
   least some cache on startup.

* tag 'regmap-3.4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: prevent division by zero in rbtree_show
  regmap: Export regcache_sync_region()

drivers/base/regmap/regcache-rbtree.c

@@ -138,6 +138,7 @@ static int rbtree_show(struct seq_file *s, void *ignored)
 	unsigned int base, top;
 	int nodes = 0;
 	int registers = 0;
+	int average;
 
 	mutex_lock(&map->lock);
 
@@ -152,8 +153,13 @@ static int rbtree_show(struct seq_file *s, void *ignored)
 		registers += top - base + 1;
 	}
 
+	if (nodes)
+		average = registers / nodes;
+	else
+		average = 0;
+
 	seq_printf(s, "%d nodes, %d registers, average %d registers\n",
-		   nodes, registers, registers / nodes);
+		   nodes, registers, average);
 
 	mutex_unlock(&map->lock);
 

drivers/base/regmap/regcache.c

@@ -346,6 +346,7 @@ out:
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(regcache_sync_region);
 
 /**
  * regcache_cache_only: Put a register map into cache only mode