regmap: Fixes for v3.10

The biggest fix here is Lars-Peter's fix for custom locking callbacks
 which is pretty localised but important for those devices that use the
 feature.  Otherwise we've got a couple of fairly small cleanups which
 would have been sent sooner were it not for letting Lars-Peter's patch
 soak for a while.
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Merge tag 'regmap-v3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap fixes from Mark Brown:
 "The biggest fix here is Lars-Peter's fix for custom locking callbacks
  which is pretty localised but important for those devices that use the
  feature.  Otherwise we've got a couple of fairly small cleanups which
  would have been sent sooner were it not for letting Lars-Peter's patch
  soak for a while"

* tag 'regmap-v3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: rbtree: Fixed node range check on sync
  regmap: regcache: Fixup locking for custom lock callbacks
  regmap: debugfs: Check return value of regmap_write()

drivers/base/regmap/regcache-rbtree.c

@@ -143,7 +143,7 @@ static int rbtree_show(struct seq_file *s, void *ignored)
 	int registers = 0;
 	int this_registers, average;
 
-	map->lock(map);
+	map->lock(map->lock_arg);
 
 	mem_size = sizeof(*rbtree_ctx);
 	mem_size += BITS_TO_LONGS(map->cache_present_nbits) * sizeof(long);
@@ -170,7 +170,7 @@ static int rbtree_show(struct seq_file *s, void *ignored)
 	seq_printf(s, "%d nodes, %d registers, average %d registers, used %zu bytes\n",
 		   nodes, registers, average, mem_size);
 
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 
 	return 0;
 }
@@ -391,8 +391,6 @@ static int regcache_rbtree_sync(struct regmap *map, unsigned int min,
 	for (node = rb_first(&rbtree_ctx->root); node; node = rb_next(node)) {
 		rbnode = rb_entry(node, struct regcache_rbtree_node, node);
 
-		if (rbnode->base_reg < min)
-			continue;
 		if (rbnode->base_reg > max)
 			break;
 		if (rbnode->base_reg + rbnode->blklen < min)

drivers/base/regmap/regcache.c

@@ -270,7 +270,7 @@ int regcache_sync(struct regmap *map)
 
 	BUG_ON(!map->cache_ops || !map->cache_ops->sync);
 
-	map->lock(map);
+	map->lock(map->lock_arg);
 	/* Remember the initial bypass state */
 	bypass = map->cache_bypass;
 	dev_dbg(map->dev, "Syncing %s cache\n",
@@ -306,7 +306,7 @@ out:
 	trace_regcache_sync(map->dev, name, "stop");
 	/* Restore the bypass state */
 	map->cache_bypass = bypass;
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 
 	return ret;
 }
@@ -333,7 +333,7 @@ int regcache_sync_region(struct regmap *map, unsigned int min,
 
 	BUG_ON(!map->cache_ops || !map->cache_ops->sync);
 
-	map->lock(map);
+	map->lock(map->lock_arg);
 
 	/* Remember the initial bypass state */
 	bypass = map->cache_bypass;
@@ -352,7 +352,7 @@ out:
 	trace_regcache_sync(map->dev, name, "stop region");
 	/* Restore the bypass state */
 	map->cache_bypass = bypass;
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 
 	return ret;
 }
@@ -372,11 +372,11 @@ EXPORT_SYMBOL_GPL(regcache_sync_region);
  */
 void regcache_cache_only(struct regmap *map, bool enable)
 {
-	map->lock(map);
+	map->lock(map->lock_arg);
 	WARN_ON(map->cache_bypass && enable);
 	map->cache_only = enable;
 	trace_regmap_cache_only(map->dev, enable);
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 }
 EXPORT_SYMBOL_GPL(regcache_cache_only);
 
@@ -391,9 +391,9 @@ EXPORT_SYMBOL_GPL(regcache_cache_only);
  */
 void regcache_mark_dirty(struct regmap *map)
 {
-	map->lock(map);
+	map->lock(map->lock_arg);
 	map->cache_dirty = true;
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 }
 EXPORT_SYMBOL_GPL(regcache_mark_dirty);
 
@@ -410,11 +410,11 @@ EXPORT_SYMBOL_GPL(regcache_mark_dirty);
  */
 void regcache_cache_bypass(struct regmap *map, bool enable)
 {
-	map->lock(map);
+	map->lock(map->lock_arg);
 	WARN_ON(map->cache_only && enable);
 	map->cache_bypass = enable;
 	trace_regmap_cache_bypass(map->dev, enable);
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 }
 EXPORT_SYMBOL_GPL(regcache_cache_bypass);
 

drivers/base/regmap/regmap-debugfs.c

@@ -265,6 +265,7 @@ static ssize_t regmap_map_write_file(struct file *file,
 	char *start = buf;
 	unsigned long reg, value;
 	struct regmap *map = file->private_data;
+	int ret;
 
 	buf_size = min(count, (sizeof(buf)-1));
 	if (copy_from_user(buf, user_buf, buf_size))
@@ -282,7 +283,9 @@ static ssize_t regmap_map_write_file(struct file *file,
 	/* Userspace has been fiddling around behind the kernel's back */
 	add_taint(TAINT_USER, LOCKDEP_NOW_UNRELIABLE);
 
-	regmap_write(map, reg, value);
+	ret = regmap_write(map, reg, value);
+	if (ret < 0)
+		return ret;
 	return buf_size;
 }
 #else