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authorMika Westerberg <mika.westerberg@linux.intel.com>2021-01-08 15:38:24 +0300
committerMika Westerberg <mika.westerberg@linux.intel.com>2021-03-18 18:25:31 +0300
commit7d3084c0b77c6c417a16fc1c5bf3bc3149d20fab (patch)
treef0bb6a614b1a85b800b9547395a28d758dbbc4b2 /drivers/thunderbolt
parent3bb163331e3acafb217f4259b1987e5f56b0456a (diff)
downloadlinux-7d3084c0b77c6c417a16fc1c5bf3bc3149d20fab.tar.xz
thunderbolt: Add tb_property_copy_dir()
This function takes a deep copy of the properties. We need this in order to support more dynamic properties per XDomain connection as required by the USB4 inter-domain service spec. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt')
-rw-r--r--drivers/thunderbolt/property.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/thunderbolt/property.c b/drivers/thunderbolt/property.c
index d5b0cdb8f0b1..dc555cda98e6 100644
--- a/drivers/thunderbolt/property.c
+++ b/drivers/thunderbolt/property.c
@@ -502,6 +502,77 @@ ssize_t tb_property_format_dir(const struct tb_property_dir *dir, u32 *block,
}
/**
+ * tb_property_copy_dir() - Take a deep copy of directory
+ * @dir: Directory to copy
+ *
+ * This function takes a deep copy of @dir and returns back the copy. In
+ * case of error returns %NULL. The resulting directory needs to be
+ * released by calling tb_property_free_dir().
+ */
+struct tb_property_dir *tb_property_copy_dir(const struct tb_property_dir *dir)
+{
+ struct tb_property *property, *p = NULL;
+ struct tb_property_dir *d;
+
+ if (!dir)
+ return NULL;
+
+ d = tb_property_create_dir(dir->uuid);
+ if (!d)
+ return NULL;
+
+ list_for_each_entry(property, &dir->properties, list) {
+ struct tb_property *p;
+
+ p = tb_property_alloc(property->key, property->type);
+ if (!p)
+ goto err_free;
+
+ p->length = property->length;
+
+ switch (property->type) {
+ case TB_PROPERTY_TYPE_DIRECTORY:
+ p->value.dir = tb_property_copy_dir(property->value.dir);
+ if (!p->value.dir)
+ goto err_free;
+ break;
+
+ case TB_PROPERTY_TYPE_DATA:
+ p->value.data = kmemdup(property->value.data,
+ property->length * 4,
+ GFP_KERNEL);
+ if (!p->value.data)
+ goto err_free;
+ break;
+
+ case TB_PROPERTY_TYPE_TEXT:
+ p->value.text = kzalloc(p->length * 4, GFP_KERNEL);
+ if (!p->value.text)
+ goto err_free;
+ strcpy(p->value.text, property->value.text);
+ break;
+
+ case TB_PROPERTY_TYPE_VALUE:
+ p->value.immediate = property->value.immediate;
+ break;
+
+ default:
+ break;
+ }
+
+ list_add_tail(&p->list, &d->properties);
+ }
+
+ return d;
+
+err_free:
+ kfree(p);
+ tb_property_free_dir(d);
+
+ return NULL;
+}
+
+/**
* tb_property_add_immediate() - Add immediate property to directory
* @parent: Directory to add the property
* @key: Key for the property