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.

Signed-off-by: Mark Salyzyn <salyzyn@android.com>
Cc: Tim Murray <timmurray@google.com>
Cc: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rafael J. Wysocki <rafael@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: kernel-team@android.com
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20191113225429.118495-1-salyzyn@android.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/firmware_loader/Kconfig b/drivers/base/firmware_loader/Kconfig
index 3f9e274..33e6552 100644 (file)
--- a/drivers/base/firmware_loader/Kconfig
+++ b/drivers/base/firmware_loader/Kconfig
@@ -169,5 +169,17 @@ config FW_LOADER_COMPRESS
          be compressed with either none or crc32 integrity check type (pass
          "-C crc32" option to xz command).
 
+config FW_CACHE
+       bool "Enable firmware caching during suspend"
+       depends on PM_SLEEP
+       default y if PM_SLEEP
+       help
+         Because firmware caching generates uevent messages that are sent
+         over a netlink socket, it can prevent suspend on many platforms.
+         It is also not always useful, so on such platforms we have the
+         option.
+
+         If unsure, say Y.
+
 endif # FW_LOADER
 endmenu

diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c
index 7302e6b..249add8 100644 (file)
--- a/drivers/base/firmware_loader/main.c
+++ b/drivers/base/firmware_loader/main.c
@@ -51,7 +51,7 @@ struct firmware_cache {
        struct list_head head;
        int state;
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_FW_CACHE
        /*
         * Names of firmware images which have been cached successfully
         * will be added into the below list so that device uncache
@@ -557,7 +557,7 @@ static void fw_set_page_data(struct fw_priv *fw_priv, struct firmware *fw)
                 (unsigned int)fw_priv->size);
 }
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_FW_CACHE
 static void fw_name_devm_release(struct device *dev, void *res)
 {
        struct fw_name_devm *fwn = res;
@@ -1047,7 +1047,7 @@ request_firmware_nowait(
 }
 EXPORT_SYMBOL(request_firmware_nowait);
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_FW_CACHE
 static ASYNC_DOMAIN_EXCLUSIVE(fw_cache_domain);
 
 /**