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    Subject[ 02/10] [Suspend2] Module (de)registration.
    Date

    This patch implements registration and deregistration of modules that are
    used for page transformation and storage.

    Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

    kernel/power/modules.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 87 insertions(+), 0 deletions(-)

    diff --git a/kernel/power/modules.c b/kernel/power/modules.c
    new file mode 100644
    index 0000000..227e320
    --- /dev/null
    +++ b/kernel/power/modules.c
    @@ -0,0 +1,87 @@
    +/*
    + * kernel/power/modules.c
    + *
    + * Copyright (C) 2004-2005 Nigel Cunningham <nigel@suspend2.net>
    + *
    + */
    +
    +#include <linux/suspend.h>
    +#include <linux/module.h>
    +#include "suspend2.h"
    +#include "modules.h"
    +
    +struct list_head suspend_filters, suspend_writers, suspend_modules;
    +struct suspend_module_ops *active_writer = NULL;
    +static int num_filters = 0, num_ui = 0;
    +int num_writers = 0, num_modules = 0;
    +
    +/*
    + * suspend_register_module
    + *
    + * Register a module.
    + */
    +int suspend_register_module(struct suspend_module_ops *module)
    +{
    + if (find_module_given_name(module->name))
    + return -EBUSY;
    +
    + switch (module->type) {
    + case FILTER_PLUGIN:
    + list_add_tail(&module->ops.filter.filter_list,
    + &suspend_filters);
    + num_filters++;
    + break;
    +
    + case WRITER_PLUGIN:
    + list_add_tail(&module->ops.writer.writer_list,
    + &suspend_writers);
    + num_writers++;
    + break;
    +
    + case MISC_PLUGIN:
    + break;
    +
    + default:
    + printk("Hmmm. Plugin '%s' has an invalid type."
    + " It has been ignored.\n", module->name);
    + return -EINVAL;
    + }
    + list_add_tail(&module->module_list, &suspend_modules);
    + num_modules++;
    +
    + return 0;
    +}
    +
    +/*
    + * suspend_unregister_module
    + *
    + * Remove a module.
    + */
    +void suspend_unregister_module(struct suspend_module_ops *module)
    +{
    + switch (module->type) {
    + case FILTER_PLUGIN:
    + list_del(&module->ops.filter.filter_list);
    + num_filters--;
    + break;
    +
    + case WRITER_PLUGIN:
    + list_del(&module->ops.writer.writer_list);
    + num_writers--;
    + if (active_writer == module) {
    + active_writer = NULL;
    + set_suspend_state(SUSPEND_DISABLED);
    + }
    + break;
    +
    + case MISC_PLUGIN:
    + break;
    +
    + default:
    + printk("Hmmm. Plugin '%s' has an invalid type."
    + " It has been ignored.\n", module->name);
    + return;
    + }
    + list_del(&module->module_list);
    + num_modules--;
    +}
    --
    Nigel Cunningham nigel at suspend2 dot net
    -
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