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thunderbolt: Add tb_property_copy_dir()

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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>
This commit is contained in:
Mika Westerberg 2021-01-08 14:38:24 +02:00
parent 3bb163331e
commit 7d3084c0b7
2 changed files with 72 additions and 0 deletions
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71
drivers/thunderbolt/property.c
View File

@ -501,6 +501,77 @@ ssize_t tb_property_format_dir(const struct tb_property_dir *dir, u32 *block,
return ret < 0 ? ret : 0;
}
/**
* 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

1
include/linux/thunderbolt.h
View File

@ -146,6 +146,7 @@ struct tb_property_dir *tb_property_parse_dir(const u32 *block,
size_t block_len);
ssize_t tb_property_format_dir(const struct tb_property_dir *dir, u32 *block,
size_t block_len);
struct tb_property_dir *tb_property_copy_dir(const struct tb_property_dir *dir);
struct tb_property_dir *tb_property_create_dir(const uuid_t *uuid);
void tb_property_free_dir(struct tb_property_dir *dir);
int tb_property_add_immediate(struct tb_property_dir *parent, const char *key,