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staging: most: configfs: add code for link removal 

This patch adds code that cleans up established links whenever the destroy
attribute is set or if the config_item (directory) is being removed.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.2
Christian Gromm 2019-04-03 15:19:54 +02:00 committed by Greg Kroah-Hartman
parent a15f465caf
commit 1a89eb0a8f
1 changed files with 36 additions and 2 deletions
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38
drivers/staging/most/configfs.c
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@ -16,6 +16,7 @@ struct mdev_link {
struct config_item item;
struct list_head list;
bool create_link;
bool destroy_link;
u16 num_buffers;
u16 buffer_size;
u16 subbuffer_size;
@ -132,8 +133,7 @@ static ssize_t mdev_link_create_link_store(struct config_item *item,
if (ret)
return ret;
if (!tmp)
return most_remove_link(mdev_link->device, mdev_link->channel,
mdev_link->comp);
return count;
ret = set_config_and_add_link(mdev_link);
if (ret && ret != -ENODEV)
return ret;
@ -142,6 +142,28 @@ static ssize_t mdev_link_create_link_store(struct config_item *item,
return count;
}
static ssize_t mdev_link_destroy_link_store(struct config_item *item,
const char *page, size_t count)
{
struct mdev_link *mdev_link = to_mdev_link(item);
bool tmp;
int ret;
ret = kstrtobool(page, &tmp);
if (ret)
return ret;
if (!tmp)
return count;
mdev_link->destroy_link = tmp;
ret = most_remove_link(mdev_link->device, mdev_link->channel,
mdev_link->comp);
if (ret)
return ret;
if (!list_empty(&mdev_link_list))
list_del(&mdev_link->list);
return count;
}
static ssize_t mdev_link_direction_show(struct config_item *item, char *page)
{
return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->direction);
@ -326,6 +348,7 @@ static ssize_t mdev_link_dbr_size_store(struct config_item *item,
}
CONFIGFS_ATTR_WO(mdev_link_, create_link);
CONFIGFS_ATTR_WO(mdev_link_, destroy_link);
CONFIGFS_ATTR(mdev_link_, device);
CONFIGFS_ATTR(mdev_link_, channel);
CONFIGFS_ATTR(mdev_link_, comp);
@ -340,6 +363,7 @@ CONFIGFS_ATTR(mdev_link_, dbr_size);
static struct configfs_attribute *mdev_link_attrs[] = {
&mdev_link_attr_create_link,
&mdev_link_attr_destroy_link,
&mdev_link_attr_device,
&mdev_link_attr_channel,
&mdev_link_attr_comp,
@ -356,6 +380,16 @@ static struct configfs_attribute *mdev_link_attrs[] = {
static void mdev_link_release(struct config_item *item)
{
struct mdev_link *mdev_link = to_mdev_link(item);
int ret;
if (!list_empty(&mdev_link_list)) {
ret = most_remove_link(mdev_link->device, mdev_link->channel,
mdev_link->comp);
if (ret && (ret != -ENODEV))
pr_err("Removing link failed.\n");
list_del(&mdev_link->list);
}
kfree(to_mdev_link(item));
}