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net: dsa: provide a find or new tree helper
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>
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@ -21,33 +21,35 @@
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#include "dsa_priv.h"
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static LIST_HEAD(dsa_switch_trees);
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static LIST_HEAD(dsa_tree_list);
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static DEFINE_MUTEX(dsa2_mutex);
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static const struct devlink_ops dsa_devlink_ops = {
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};
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static struct dsa_switch_tree *dsa_get_dst(unsigned int index)
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static struct dsa_switch_tree *dsa_tree_find(int index)
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{
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struct dsa_switch_tree *dst;
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list_for_each_entry(dst, &dsa_switch_trees, list)
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list_for_each_entry(dst, &dsa_tree_list, list)
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if (dst->index == index)
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return dst;
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return NULL;
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}
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static struct dsa_switch_tree *dsa_add_dst(unsigned int index)
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static struct dsa_switch_tree *dsa_tree_alloc(int index)
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{
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struct dsa_switch_tree *dst;
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dst = kzalloc(sizeof(*dst), GFP_KERNEL);
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if (!dst)
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return NULL;
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dst->index = index;
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INIT_LIST_HEAD(&dst->list);
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list_add_tail(&dsa_switch_trees, &dst->list);
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list_add_tail(&dsa_tree_list, &dst->list);
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/* Initialize the reference counter to the number of switches, not 1 */
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kref_init(&dst->refcount);
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@ -62,6 +64,17 @@ static void dsa_tree_free(struct dsa_switch_tree *dst)
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kfree(dst);
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}
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static struct dsa_switch_tree *dsa_tree_touch(int index)
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{
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struct dsa_switch_tree *dst;
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dst = dsa_tree_find(index);
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if (!dst)
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dst = dsa_tree_alloc(index);
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return dst;
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}
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static void dsa_tree_get(struct dsa_switch_tree *dst)
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{
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kref_get(&dst->refcount);
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@ -745,12 +758,9 @@ static int _dsa_register_switch(struct dsa_switch *ds)
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return err;
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}
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dst = dsa_get_dst(tree);
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if (!dst) {
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dst = dsa_add_dst(tree);
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if (!dst)
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return -ENOMEM;
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}
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dst = dsa_tree_touch(tree);
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if (!dst)
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return -ENOMEM;
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if (dst->ds[index])
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return -EBUSY;
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