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net: dsa: provide a find or new tree helper

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Rename dsa_get_dst to dsa_tree_find since it doesn't increment the
reference counter, rename dsa_add_dst to dsa_tree_alloc for symmetry
with dsa_tree_free, and provide a convenient dsa_tree_touch function to
find or allocate a new tree.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot 2017-11-03 19:05:24 -04:00 committed by David S. Miller
parent 65254108b4
commit 1ca28ec9ab
1 changed files with 21 additions and 11 deletions
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32
net/dsa/dsa2.c
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@ -21,33 +21,35 @@
#include "dsa_priv.h"
static LIST_HEAD(dsa_switch_trees);
static LIST_HEAD(dsa_tree_list);
static DEFINE_MUTEX(dsa2_mutex);
static const struct devlink_ops dsa_devlink_ops = {
};
static struct dsa_switch_tree *dsa_get_dst(unsigned int index)
static struct dsa_switch_tree *dsa_tree_find(int index)
{
struct dsa_switch_tree *dst;
list_for_each_entry(dst, &dsa_switch_trees, list)
list_for_each_entry(dst, &dsa_tree_list, list)
if (dst->index == index)
return dst;
return NULL;
}
static struct dsa_switch_tree *dsa_add_dst(unsigned int index)
static struct dsa_switch_tree *dsa_tree_alloc(int index)
{
struct dsa_switch_tree *dst;
dst = kzalloc(sizeof(*dst), GFP_KERNEL);
if (!dst)
return NULL;
dst->index = index;
INIT_LIST_HEAD(&dst->list);
list_add_tail(&dsa_switch_trees, &dst->list);
list_add_tail(&dsa_tree_list, &dst->list);
/* Initialize the reference counter to the number of switches, not 1 */
kref_init(&dst->refcount);
@ -62,6 +64,17 @@ static void dsa_tree_free(struct dsa_switch_tree *dst)
kfree(dst);
}
static struct dsa_switch_tree *dsa_tree_touch(int index)
{
struct dsa_switch_tree *dst;
dst = dsa_tree_find(index);
if (!dst)
dst = dsa_tree_alloc(index);
return dst;
}
static void dsa_tree_get(struct dsa_switch_tree *dst)
{
kref_get(&dst->refcount);
@ -745,12 +758,9 @@ static int _dsa_register_switch(struct dsa_switch *ds)
return err;
}
dst = dsa_get_dst(tree);
if (!dst) {
dst = dsa_add_dst(tree);
if (!dst)
return -ENOMEM;
}
dst = dsa_tree_touch(tree);
if (!dst)
return -ENOMEM;
if (dst->ds[index])
return -EBUSY;