Revision f5d9e56c58052a4f206f6da7df1b61e52bef5a77 authored by Jerome Brunet on 13 November 2017, 11:09:40 UTC, committed by OpenEmbedded on 19 December 2019, 12:26:43 UTC
Turn on CONFIG_CEC_SUPPORT and CONFIG_CEC_PLATFORM_DRIVERS Turn on CONFIG_VIDEO_MESON_AO_CEC as module Turn on CONFIG_DRM_DW_HDMI_CEC as module Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> %% original patch: 0219-ARM64-defconfig-enable-CEC-support.patch
1 parent e45460f
dm-path-selector.c
/*
* Copyright (C) 2003 Sistina Software.
* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
*
* Module Author: Heinz Mauelshagen
*
* This file is released under the GPL.
*
* Path selector registration.
*/
#include <linux/device-mapper.h>
#include <linux/module.h>
#include "dm-path-selector.h"
#include <linux/slab.h>
struct ps_internal {
struct path_selector_type pst;
struct list_head list;
};
#define pst_to_psi(__pst) container_of((__pst), struct ps_internal, pst)
static LIST_HEAD(_path_selectors);
static DECLARE_RWSEM(_ps_lock);
static struct ps_internal *__find_path_selector_type(const char *name)
{
struct ps_internal *psi;
list_for_each_entry(psi, &_path_selectors, list) {
if (!strcmp(name, psi->pst.name))
return psi;
}
return NULL;
}
static struct ps_internal *get_path_selector(const char *name)
{
struct ps_internal *psi;
down_read(&_ps_lock);
psi = __find_path_selector_type(name);
if (psi && !try_module_get(psi->pst.module))
psi = NULL;
up_read(&_ps_lock);
return psi;
}
struct path_selector_type *dm_get_path_selector(const char *name)
{
struct ps_internal *psi;
if (!name)
return NULL;
psi = get_path_selector(name);
if (!psi) {
request_module("dm-%s", name);
psi = get_path_selector(name);
}
return psi ? &psi->pst : NULL;
}
void dm_put_path_selector(struct path_selector_type *pst)
{
struct ps_internal *psi;
if (!pst)
return;
down_read(&_ps_lock);
psi = __find_path_selector_type(pst->name);
if (!psi)
goto out;
module_put(psi->pst.module);
out:
up_read(&_ps_lock);
}
static struct ps_internal *_alloc_path_selector(struct path_selector_type *pst)
{
struct ps_internal *psi = kzalloc(sizeof(*psi), GFP_KERNEL);
if (psi)
psi->pst = *pst;
return psi;
}
int dm_register_path_selector(struct path_selector_type *pst)
{
int r = 0;
struct ps_internal *psi = _alloc_path_selector(pst);
if (!psi)
return -ENOMEM;
down_write(&_ps_lock);
if (__find_path_selector_type(pst->name)) {
kfree(psi);
r = -EEXIST;
} else
list_add(&psi->list, &_path_selectors);
up_write(&_ps_lock);
return r;
}
int dm_unregister_path_selector(struct path_selector_type *pst)
{
struct ps_internal *psi;
down_write(&_ps_lock);
psi = __find_path_selector_type(pst->name);
if (!psi) {
up_write(&_ps_lock);
return -EINVAL;
}
list_del(&psi->list);
up_write(&_ps_lock);
kfree(psi);
return 0;
}
EXPORT_SYMBOL_GPL(dm_register_path_selector);
EXPORT_SYMBOL_GPL(dm_unregister_path_selector);
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