linux-kernel - [PATCH v2] firmware_class: make firmware caching configurable

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Date:   Wed, 13 Nov 2019 14:54:26 -0800
From:   Mark Salyzyn <salyzyn@...roid.com>
To:     linux-kernel@...r.kernel.org
Cc:     kernel-team@...roid.com, Mark Salyzyn <salyzyn@...roid.com>,
        Tim Murray <timmurray@...gle.com>,
        Venkata Narendra Kumar Gutta <vnkgutta@...eaurora.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>
Subject: [PATCH v2] 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@...roid.com>
Cc: Tim Murray <timmurray@...gle.com>
Cc: Venkata Narendra Kumar Gutta <vnkgutta@...eaurora.org>
Cc: Luis Chamberlain <mcgrof@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Rafael J. Wysocki <rafael@...nel.org>
Cc: linux-kernel@...r.kernel.org
Cc: kernel-team@...roid.com
---
v2
- move config from drivers/base/Kconfig to
  drivers/base/firmware_loader/Kconfig
- drop blank line
- default yes conditional on PM_SLEEP
---
 drivers/base/firmware_loader/Kconfig | 12 ++++++++++++
 drivers/base/firmware_loader/main.c  |  6 +++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/base/firmware_loader/Kconfig b/drivers/base/firmware_loader/Kconfig
index 3f9e274e2ed3..33e6552ddbb6 100644
--- 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 bf44c79beae9..1c9f03514a47 100644
--- 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
@@ -556,7 +556,7 @@ 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;
@@ -1046,7 +1046,7 @@ request_firmware_nowait(
 }
 EXPORT_SYMBOL(request_firmware_nowait);
 
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_FW_CACHE
 static ASYNC_DOMAIN_EXCLUSIVE(fw_cache_domain);
 
 /**
-- 
2.24.0.rc1.363.gb1bccd3e3d-goog