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configfs: switch ->default groups to a linked list

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Replace the current NULL-terminated array of default groups with a linked
list.  This gets rid of lots of nasty code to size and/or dynamically
allocate the array.

While we're at it also provide a conveniant helper to remove the default
groups.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Felipe Balbi <balbi@kernel.org>		[drivers/usb/gadget]
Acked-by: Joel Becker <jlbec@evilplan.org>
Acked-by: Nicholas Bellinger <nab@linux-iscsi.org>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
This commit is contained in:
Christoph Hellwig
2016-02-26 11:02:14 +01:00
parent b1f1a29d8f
commit 1ae1602de0
17 changed files with 281 additions and 629 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/usb/gadget/configfs.c
View File

@@ -49,7 +49,6 @@ struct gadget_info {
struct config_group configs_group;
struct config_group strings_group;
struct config_group os_desc_group;
struct config_group *default_groups[5];
struct mutex lock;
struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
@@ -71,7 +70,6 @@ static inline struct gadget_info *to_gadget_info(struct config_item *item)
struct config_usb_cfg {
struct config_group group;
struct config_group strings_group;
struct config_group *default_groups[2];
struct list_head string_list;
struct usb_configuration c;
struct list_head func_list;
@@ -666,13 +664,12 @@ static struct config_group *config_desc_make(
INIT_LIST_HEAD(&cfg->string_list);
INIT_LIST_HEAD(&cfg->func_list);
cfg->group.default_groups = cfg->default_groups;
cfg->default_groups[0] = &cfg->strings_group;
config_group_init_type_name(&cfg->group, name,
&gadget_config_type);
config_group_init_type_name(&cfg->strings_group, "strings",
&gadget_config_name_strings_type);
configfs_add_default_group(&cfg->strings_group, &cfg->group);
ret = usb_add_config_only(&gi->cdev, &cfg->c);
if (ret)
@@ -1149,15 +1146,11 @@ int usb_os_desc_prepare_interf_dir(struct config_group *parent,
char **names,
struct module *owner)
{
struct config_group **f_default_groups, *os_desc_group,
**interface_groups;
struct config_group *os_desc_group;
struct config_item_type *os_desc_type, *interface_type;
vla_group(data_chunk);
vla_item(data_chunk, struct config_group *, f_default_groups, 2);
vla_item(data_chunk, struct config_group, os_desc_group, 1);
vla_item(data_chunk, struct config_group *, interface_groups,
n_interf + 1);
vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
vla_item(data_chunk, struct config_item_type, interface_type, 1);
@@ -1165,18 +1158,14 @@ int usb_os_desc_prepare_interf_dir(struct config_group *parent,
if (!vlabuf)
return -ENOMEM;
f_default_groups = vla_ptr(vlabuf, data_chunk, f_default_groups);
os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
interface_groups = vla_ptr(vlabuf, data_chunk, interface_groups);
interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
parent->default_groups = f_default_groups;
os_desc_type->ct_owner = owner;
config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
f_default_groups[0] = os_desc_group;
configfs_add_default_group(os_desc_group, parent);
os_desc_group->default_groups = interface_groups;
interface_type->ct_group_ops = &interf_grp_ops;
interface_type->ct_attrs = interf_grp_attrs;
interface_type->ct_owner = owner;
@@ -1189,7 +1178,7 @@ int usb_os_desc_prepare_interf_dir(struct config_group *parent,
config_group_init_type_name(&d->group, "", interface_type);
config_item_set_name(&d->group.cg_item, "interface.%s",
names[n_interf]);
interface_groups[n_interf] = &d->group;
configfs_add_default_group(&d->group, os_desc_group);
}
return 0;
@@ -1423,20 +1412,23 @@ static struct config_group *gadgets_make(
if (!gi)
return ERR_PTR(-ENOMEM);
gi->group.default_groups = gi->default_groups;
gi->group.default_groups[0] = &gi->functions_group;
gi->group.default_groups[1] = &gi->configs_group;
gi->group.default_groups[2] = &gi->strings_group;
gi->group.default_groups[3] = &gi->os_desc_group;
config_group_init_type_name(&gi->group, name, &gadget_root_type);
config_group_init_type_name(&gi->functions_group, "functions",
&functions_type);
configfs_add_default_group(&gi->functions_group, &gi->group);
config_group_init_type_name(&gi->configs_group, "configs",
&config_desc_type);
configfs_add_default_group(&gi->configs_group, &gi->group);
config_group_init_type_name(&gi->strings_group, "strings",
&gadget_strings_strings_type);
configfs_add_default_group(&gi->strings_group, &gi->group);
config_group_init_type_name(&gi->os_desc_group, "os_desc",
&os_desc_type);
configfs_add_default_group(&gi->os_desc_group, &gi->group);
gi->composite.bind = configfs_do_nothing;
gi->composite.unbind = configfs_do_nothing;
@@ -1461,8 +1453,6 @@ static struct config_group *gadgets_make(
if (!gi->composite.gadget_driver.function)
goto err;
config_group_init_type_name(&gi->group, name,
&gadget_root_type);
return &gi->group;
err:
kfree(gi);

6
drivers/usb/gadget/function/f_mass_storage.c
View File

@@ -3484,12 +3484,12 @@ static struct usb_function_instance *fsg_alloc_inst(void)
opts->lun0.lun = opts->common->luns[0];
opts->lun0.lun_id = 0;
config_group_init_type_name(&opts->lun0.group, "lun.0", &fsg_lun_type);
opts->default_groups[0] = &opts->lun0.group;
opts->func_inst.group.default_groups = opts->default_groups;
config_group_init_type_name(&opts->func_inst.group, "", &fsg_func_type);
config_group_init_type_name(&opts->lun0.group, "lun.0", &fsg_lun_type);
configfs_add_default_group(&opts->lun0.group, &opts->func_inst.group);
return &opts->func_inst;
release_buffers:

5
drivers/usb/gadget/function/f_rndis.c
View File

@@ -889,7 +889,6 @@ static void rndis_free_inst(struct usb_function_instance *f)
free_netdev(opts->net);
}
kfree(opts->rndis_os_desc.group.default_groups); /* single VLA chunk */
kfree(opts);
}
@@ -916,10 +915,10 @@ static struct usb_function_instance *rndis_alloc_inst(void)
descs[0] = &opts->rndis_os_desc;
names[0] = "rndis";
usb_os_desc_prepare_interf_dir(&opts->func_inst.group, 1, descs,
names, THIS_MODULE);
config_group_init_type_name(&opts->func_inst.group, "",
&rndis_func_type);
usb_os_desc_prepare_interf_dir(&opts->func_inst.group, 1, descs,
names, THIS_MODULE);
return &opts->func_inst;
}

198
drivers/usb/gadget/function/uvc_configfs.c
View File

@@ -272,11 +272,6 @@ static struct config_item_type uvcg_default_processing_type = {
/* struct uvcg_processing {}; */
static struct config_group *uvcg_processing_default_groups[] = {
&uvcg_default_processing.group,
NULL,
};
/* control/processing */
static struct uvcg_processing_grp {
struct config_group group;
@@ -394,11 +389,6 @@ static struct config_item_type uvcg_default_camera_type = {
/* struct uvcg_camera {}; */
static struct config_group *uvcg_camera_default_groups[] = {
&uvcg_default_camera.group,
NULL,
};
/* control/terminal/camera */
static struct uvcg_camera_grp {
struct config_group group;
@@ -477,11 +467,6 @@ static struct config_item_type uvcg_default_output_type = {
/* struct uvcg_output {}; */
static struct config_group *uvcg_output_default_groups[] = {
&uvcg_default_output.group,
NULL,
};
/* control/terminal/output */
static struct uvcg_output_grp {
struct config_group group;
@@ -491,12 +476,6 @@ static struct config_item_type uvcg_output_grp_type = {
.ct_owner = THIS_MODULE,
};
static struct config_group *uvcg_terminal_default_groups[] = {
&uvcg_camera_grp.group,
&uvcg_output_grp.group,
NULL,
};
/* control/terminal */
static struct uvcg_terminal_grp {
struct config_group group;
@@ -619,12 +598,6 @@ static struct config_item_type uvcg_control_class_type = {
.ct_owner = THIS_MODULE,
};
static struct config_group *uvcg_control_class_default_groups[] = {
&uvcg_control_class_fs.group,
&uvcg_control_class_ss.group,
NULL,
};
/* control/class */
static struct uvcg_control_class_grp {
struct config_group group;
@@ -634,14 +607,6 @@ static struct config_item_type uvcg_control_class_grp_type = {
.ct_owner = THIS_MODULE,
};
static struct config_group *uvcg_control_default_groups[] = {
&uvcg_control_header_grp.group,
&uvcg_processing_grp.group,
&uvcg_terminal_grp.group,
&uvcg_control_class_grp.group,
NULL,
};
/* control */
static struct uvcg_control_grp {
struct config_group group;
@@ -1780,11 +1745,6 @@ static struct config_item_type uvcg_default_color_matching_type = {
/* struct uvcg_color_matching {}; */
static struct config_group *uvcg_color_matching_default_groups[] = {
&uvcg_default_color_matching.group,
NULL,
};
/* streaming/color_matching */
static struct uvcg_color_matching_grp {
struct config_group group;
@@ -2145,13 +2105,6 @@ static struct config_item_type uvcg_streaming_class_type = {
.ct_owner = THIS_MODULE,
};
static struct config_group *uvcg_streaming_class_default_groups[] = {
&uvcg_streaming_class_fs.group,
&uvcg_streaming_class_hs.group,
&uvcg_streaming_class_ss.group,
NULL,
};
/* streaming/class */
static struct uvcg_streaming_class_grp {
struct config_group group;
@@ -2161,15 +2114,6 @@ static struct config_item_type uvcg_streaming_class_grp_type = {
.ct_owner = THIS_MODULE,
};
static struct config_group *uvcg_streaming_default_groups[] = {
&uvcg_streaming_header_grp.group,
&uvcg_uncompressed_grp.group,
&uvcg_mjpeg_grp.group,
&uvcg_color_matching_grp.group,
&uvcg_streaming_class_grp.group,
NULL,
};
/* streaming */
static struct uvcg_streaming_grp {
struct config_group group;
@@ -2179,12 +2123,6 @@ static struct config_item_type uvcg_streaming_grp_type = {
.ct_owner = THIS_MODULE,
};
static struct config_group *uvcg_default_groups[] = {
&uvcg_control_grp.group,
&uvcg_streaming_grp.group,
NULL,
};
static inline struct f_uvc_opts *to_f_uvc_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_uvc_opts,
@@ -2273,59 +2211,64 @@ static struct config_item_type uvc_func_type = {
.ct_owner = THIS_MODULE,
};
static inline void uvcg_init_group(struct config_group *g,
struct config_group **default_groups,
const char *name,
struct config_item_type *type)
{
g->default_groups = default_groups;
config_group_init_type_name(g, name, type);
}
int uvcg_attach_configfs(struct f_uvc_opts *opts)
{
config_group_init_type_name(&uvcg_control_header_grp.group,
"header",
&uvcg_control_header_grp_type);
config_group_init_type_name(&uvcg_default_processing.group,
"default",
&uvcg_default_processing_type);
uvcg_init_group(&uvcg_processing_grp.group,
uvcg_processing_default_groups,
"processing",
&uvcg_processing_grp_type);
"default", &uvcg_default_processing_type);
config_group_init_type_name(&uvcg_processing_grp.group,
"processing", &uvcg_processing_grp_type);
configfs_add_default_group(&uvcg_default_processing.group,
&uvcg_processing_grp.group);
config_group_init_type_name(&uvcg_default_camera.group,
"default",
&uvcg_default_camera_type);
uvcg_init_group(&uvcg_camera_grp.group,
uvcg_camera_default_groups,
"camera",
&uvcg_camera_grp_type);
"default", &uvcg_default_camera_type);
config_group_init_type_name(&uvcg_camera_grp.group,
"camera", &uvcg_camera_grp_type);
configfs_add_default_group(&uvcg_default_camera.group,
&uvcg_camera_grp.group);
config_group_init_type_name(&uvcg_default_output.group,
"default",
&uvcg_default_output_type);
uvcg_init_group(&uvcg_output_grp.group,
uvcg_output_default_groups,
"output",
&uvcg_output_grp_type);
uvcg_init_group(&uvcg_terminal_grp.group,
uvcg_terminal_default_groups,
"terminal",
&uvcg_terminal_grp_type);
"default", &uvcg_default_output_type);
config_group_init_type_name(&uvcg_output_grp.group,
"output", &uvcg_output_grp_type);
configfs_add_default_group(&uvcg_default_output.group,
&uvcg_output_grp.group);
config_group_init_type_name(&uvcg_terminal_grp.group,
"terminal", &uvcg_terminal_grp_type);
configfs_add_default_group(&uvcg_camera_grp.group,
&uvcg_terminal_grp.group);
configfs_add_default_group(&uvcg_output_grp.group,
&uvcg_terminal_grp.group);
config_group_init_type_name(&uvcg_control_class_fs.group,
"fs",
&uvcg_control_class_type);
"fs", &uvcg_control_class_type);
config_group_init_type_name(&uvcg_control_class_ss.group,
"ss",
&uvcg_control_class_type);
uvcg_init_group(&uvcg_control_class_grp.group,
uvcg_control_class_default_groups,
"ss", &uvcg_control_class_type);
config_group_init_type_name(&uvcg_control_class_grp.group,
"class",
&uvcg_control_class_grp_type);
uvcg_init_group(&uvcg_control_grp.group,
uvcg_control_default_groups,
configfs_add_default_group(&uvcg_control_class_fs.group,
&uvcg_control_class_grp.group);
configfs_add_default_group(&uvcg_control_class_ss.group,
&uvcg_control_class_grp.group);
config_group_init_type_name(&uvcg_control_grp.group,
"control",
&uvcg_control_grp_type);
configfs_add_default_group(&uvcg_control_header_grp.group,
&uvcg_control_grp.group);
configfs_add_default_group(&uvcg_processing_grp.group,
&uvcg_control_grp.group);
configfs_add_default_group(&uvcg_terminal_grp.group,
&uvcg_control_grp.group);
configfs_add_default_group(&uvcg_control_class_grp.group,
&uvcg_control_grp.group);
config_group_init_type_name(&uvcg_streaming_header_grp.group,
"header",
&uvcg_streaming_header_grp_type);
@@ -2338,30 +2281,47 @@ int uvcg_attach_configfs(struct f_uvc_opts *opts)
config_group_init_type_name(&uvcg_default_color_matching.group,
"default",
&uvcg_default_color_matching_type);
uvcg_init_group(&uvcg_color_matching_grp.group,
uvcg_color_matching_default_groups,
config_group_init_type_name(&uvcg_color_matching_grp.group,
"color_matching",
&uvcg_color_matching_grp_type);
configfs_add_default_group(&uvcg_default_color_matching.group,
&uvcg_color_matching_grp.group);
config_group_init_type_name(&uvcg_streaming_class_fs.group,
"fs",
&uvcg_streaming_class_type);
"fs", &uvcg_streaming_class_type);
config_group_init_type_name(&uvcg_streaming_class_hs.group,
"hs",
&uvcg_streaming_class_type);
"hs", &uvcg_streaming_class_type);
config_group_init_type_name(&uvcg_streaming_class_ss.group,
"ss",
&uvcg_streaming_class_type);
uvcg_init_group(&uvcg_streaming_class_grp.group,
uvcg_streaming_class_default_groups,
"class",
&uvcg_streaming_class_grp_type);
uvcg_init_group(&uvcg_streaming_grp.group,
uvcg_streaming_default_groups,
"streaming",
&uvcg_streaming_grp_type);
uvcg_init_group(&opts->func_inst.group,
uvcg_default_groups,
"ss", &uvcg_streaming_class_type);
config_group_init_type_name(&uvcg_streaming_class_grp.group,
"class", &uvcg_streaming_class_grp_type);
configfs_add_default_group(&uvcg_streaming_class_fs.group,
&uvcg_streaming_class_grp.group);
configfs_add_default_group(&uvcg_streaming_class_hs.group,
&uvcg_streaming_class_grp.group);
configfs_add_default_group(&uvcg_streaming_class_ss.group,
&uvcg_streaming_class_grp.group);
config_group_init_type_name(&uvcg_streaming_grp.group,
"streaming", &uvcg_streaming_grp_type);
configfs_add_default_group(&uvcg_streaming_header_grp.group,
&uvcg_streaming_grp.group);
configfs_add_default_group(&uvcg_uncompressed_grp.group,
&uvcg_streaming_grp.group);
configfs_add_default_group(&uvcg_mjpeg_grp.group,
&uvcg_streaming_grp.group);
configfs_add_default_group(&uvcg_color_matching_grp.group,
&uvcg_streaming_grp.group);
configfs_add_default_group(&uvcg_streaming_class_grp.group,
&uvcg_streaming_grp.group);
config_group_init_type_name(&opts->func_inst.group,
"",
&uvc_func_type);
configfs_add_default_group(&uvcg_control_grp.group,
&opts->func_inst.group);
configfs_add_default_group(&uvcg_streaming_grp.group,
&opts->func_inst.group);
return 0;
}