linux-kernel - Re: [PATCH 2/5] x86, microcode: Don't lose error returns in save_microcode_in

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Message-ID: <20130724125703.GD30777@pd.tnic>
Date:	Wed, 24 Jul 2013 14:57:03 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] x86, microcode: Don't lose error returns in
 save_microcode_in_initrd()

On Tue, Jul 23, 2013 at 10:59:23PM +0200, Torsten Kaiser wrote:
> Don't lose the error return.
> This was lost when early amd microcode loading was added in
> 757885e94a22bcc82beb9b1445c95218cb20ceab
> 
> Signed-off-by: Torsten Kaiser <just.for.lkml@...glemail.com>
> 
> --- a/arch/x86/kernel/microcode_core_early.c	2013-07-23 19:44:05.509516795 +0200
> +++ b/arch/x86/kernel/microcode_core_early.c	2013-07-23 19:58:34.459509474 +0200
> @@ -127,11 +127,11 @@ int __init save_microcode_in_initrd(void
>  	switch (c->x86_vendor) {
>  	case X86_VENDOR_INTEL:
>  		if (c->x86 >= 6)
> -			save_microcode_in_initrd_intel();
> +			return save_microcode_in_initrd_intel();
>  		break;
>  	case X86_VENDOR_AMD:
>  		if (c->x86 >= 0x10)
> -			save_microcode_in_initrd_amd();
> +			return save_microcode_in_initrd_amd();

This one is incomplete: if we really want to hand up the error code, we
need to add a printk to the caller free_initrd_mem() saying that saving
of microcode from the initrd failed.

However, save_microcode_in_initrd_intel() already warns about it in the
error case.

So, actually, I think the warning should be issued by
save_microcode_in_initrd() and this function itself should be made to
return void. And save_microcode_in_initrd_intel() can simply return the
error code without doing the printk.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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