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firmware: fix capturing errors on fw_cache_init() on early init

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register_pm_notifier() can technically fail, caputure this.
Note that register_syscore_ops() cannot fail given it just
adds an element to a linked list. This has been broken since
v3.7. Chances of this failing however are slim.

To improve code readability move the code folded under CONFIG_PM_SLEEP
into a helper.

Fixes: 07646d9c09 ("firmware loader: cache devices firmware during suspend/resume cycle")
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Luis R. Rodriguez 2017-11-20 09:45:32 -08:00 committed by Greg Kroah-Hartman
parent a67e503b67
commit 59b6d859ff
1 changed files with 32 additions and 13 deletions
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45
drivers/base/firmware_class.c
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@ -1768,6 +1768,26 @@ static struct syscore_ops fw_syscore_ops = {
.suspend = fw_suspend,
};
static int __init register_fw_pm_ops(void)
{
int ret;
spin_lock_init(&fw_cache.name_lock);
INIT_LIST_HEAD(&fw_cache.fw_names);
INIT_DELAYED_WORK(&fw_cache.work,
device_uncache_fw_images_work);
fw_cache.pm_notify.notifier_call = fw_pm_notify;
ret = register_pm_notifier(&fw_cache.pm_notify);
if (ret)
return ret;
register_syscore_ops(&fw_syscore_ops);
return ret;
}
static inline void unregister_fw_pm_ops(void)
{
unregister_syscore_ops(&fw_syscore_ops);
@ -1778,6 +1798,10 @@ static int fw_cache_piggyback_on_request(const char *name)
{
return 0;
}
static inline int register_fw_pm_ops(void)
{
return 0;
}
static inline void unregister_fw_pm_ops(void)
{
}
@ -1788,19 +1812,6 @@ static void __init fw_cache_init(void)
spin_lock_init(&fw_cache.lock);
INIT_LIST_HEAD(&fw_cache.head);
fw_cache.state = FW_LOADER_NO_CACHE;
#ifdef CONFIG_PM_SLEEP
spin_lock_init(&fw_cache.name_lock);
INIT_LIST_HEAD(&fw_cache.fw_names);
INIT_DELAYED_WORK(&fw_cache.work,
device_uncache_fw_images_work);
fw_cache.pm_notify.notifier_call = fw_pm_notify;
register_pm_notifier(&fw_cache.pm_notify);
register_syscore_ops(&fw_syscore_ops);
#endif
}
static int fw_shutdown_notify(struct notifier_block *unused1,
@ -1821,7 +1832,15 @@ static struct notifier_block fw_shutdown_nb = {
static int __init firmware_class_init(void)
{
int ret;
/* No need to unfold these on exit */
fw_cache_init();
ret = register_fw_pm_ops();
if (ret)
return ret;
register_reboot_notifier(&fw_shutdown_nb);
#ifdef CONFIG_FW_LOADER_USER_HELPER
return class_register(&firmware_class);