linux-kernel - Re: [PATCH] [firmware_class] Fix compile with no builtin firmware

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Message-ID: <20121122021546.GA6076@shaftnet.org>
Date:	Wed, 21 Nov 2012 21:15:46 -0500
From:	Solomon Peachy <pizza@...ftnet.org>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [firmware_class] Fix compile with no builtin firmware

On Thu, Nov 22, 2012 at 09:45:23AM +0800, Ming Lei wrote:
> No, it is not related closely, CONFIG_FIRMWARE_IN_KERNEL means
> that all in-kernel-tree firmware blobs should be included in kernel binary,
> but CONFIG_EXTRA_FIRMARE means that one additional firmware
> image will be put into kernel binary.

Okay.

> Considered that there is no your problem in -linus tree or -next tree 
> and the current code works for long time, maybe it is better to not 
> touch the code. Or suggest you to study this kind of config options 
> and firmware/Makefie first, then figure out one proper patch.

Given what you've told me (i.e. support for loading "builtin" firmware is 
always required), I propose this patch instead:

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 8945f4e..d291e15 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -38,8 +38,6 @@ MODULE_LICENSE("GPL");
 
 /* Builtin firmware support */
 
-#ifdef CONFIG_FW_LOADER
-
 extern struct builtin_fw __start_builtin_fw[];
 extern struct builtin_fw __end_builtin_fw[];
 
@@ -69,19 +67,6 @@ static bool fw_is_builtin_firmware(const struct firmware *fw)
 	return false;
 }
 
-#else /* Module case - no builtin firmware support */
-
-static inline bool fw_get_builtin_firmware(struct firmware *fw, const char *name)
-{
-	return false;
-}
-
-static inline bool fw_is_builtin_firmware(const struct firmware *fw)
-{
-	return false;
-}
-#endif
-
 enum {
 	FW_STATUS_LOADING,
 	FW_STATUS_DONE,


The empty stub functions can never be compiled, as firmware_class.c 
isn't compiled when CONFIG_FW_LOADER isn't enabled.  So let's just nuke 
this unused code entirely.

 - Solomon
-- 
Solomon Peachy        		       pizza at shaftnet dot org	 
Melbourne, FL                          ^^ (mail/jabber/gtalk) ^^
Quidquid latine dictum sit, altum viditur.

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