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firmware_class: make firmware caching configurable 

Because firmware caching generates uevent messages that are sent over a
netlink socket, it can prevent suspend on many platforms. It's also not
always useful, so make it a configurable option.

Bug: 38289596
Change-Id: I1c62227129590f564b127de6dbcaf0001b2c22ad
Signed-off-by: Ajay Dudani <adudani@google.com>
This commit is contained in:
Ajay Dudani 2017-09-01 16:49:19 -07:00 committed by syphyr
parent 8d60216075
commit 7f3ad4062f
2 changed files with 12 additions and 5 deletions
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5
drivers/base/Kconfig
View File

@ -82,6 +82,11 @@ config FW_LOADER
require userspace firmware loading support, but a module built
out-of-tree does.
config FW_CACHE
bool "Enable firmware caching during suspend"
depends on PM_SLEEP
default n
config FIRMWARE_IN_KERNEL
bool "Include in-kernel firmware blobs in kernel binary"
depends on FW_LOADER

12
drivers/base/firmware_class.c
View File

@ -241,6 +241,7 @@ static int fw_lookup_and_allocate_buf(const char *fw_name,
return tmp ? 0 : -ENOMEM;
}
#ifdef CONFIG_FW_CACHE
static struct firmware_buf *fw_lookup_buf(const char *fw_name)
{
struct firmware_buf *tmp;
@ -252,6 +253,7 @@ static struct firmware_buf *fw_lookup_buf(const char *fw_name)
return tmp;
}
#endif
static void __fw_free_buf(struct kref *ref)
{
@ -1501,6 +1503,9 @@ request_firmware_nowait_direct(
map_data);
}
#ifdef CONFIG_FW_CACHE
static ASYNC_DOMAIN_EXCLUSIVE(fw_cache_domain);
/**
* cache_firmware - cache one firmware image in kernel memory space
* @fw_name: the firmware image name
@ -1561,9 +1566,6 @@ int uncache_firmware(const char *fw_name)
return -EINVAL;
}
#ifdef CONFIG_PM_SLEEP
static ASYNC_DOMAIN_EXCLUSIVE(fw_cache_domain);
static struct fw_cache_entry *alloc_fw_cache_entry(const char *name)
{
struct fw_cache_entry *fce;
@ -1827,7 +1829,7 @@ static void __init fw_cache_init(void)
INIT_LIST_HEAD(&fw_cache.head);
fw_cache.state = FW_LOADER_NO_CACHE;
#ifdef CONFIG_PM_SLEEP
#ifdef CONFIG_FW_CACHE
spin_lock_init(&fw_cache.name_lock);
INIT_LIST_HEAD(&fw_cache.fw_names);
@ -1854,7 +1856,7 @@ static int __init firmware_class_init(void)
static void __exit firmware_class_exit(void)
{
#ifdef CONFIG_PM_SLEEP
#ifdef CONFIG_FW_CACHE
unregister_syscore_ops(&fw_syscore_ops);
unregister_pm_notifier(&fw_cache.pm_notify);
#endif