linux-kernel - Re: [PATCH 1/2] iommu/vt-d: Remove the dead code in init_iommu

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Message-ID: <3d7ce5c1-c248-a14a-2dc4-79449da9aa43@linux.intel.com>
Date:   Wed, 31 May 2023 11:24:32 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     Yanfei Xu <yanfei.xu@...el.com>, dwmw2@...radead.org,
        joro@...tes.org, will@...nel.org, robin.murphy@....com
Cc:     baolu.lu@...ux.intel.com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] iommu/vt-d: Remove the dead code in init_iommu_hw()

On 5/30/23 5:25 PM, Yanfei Xu wrote:
> After 'commit 2a41ccee2fdc ("iommu/vt-d: Change
> iommu_enable/disable_translation to return void")', init_iommu_hw() only
> returns 0. If statement for return value of this function is meaningless.
> Hence change init_iommu_hw() to return viod and remove the dead code of
> if statement in init_iommu_hw()
> 
> Signed-off-by: Yanfei Xu<yanfei.xu@...el.com>
> ---
>   drivers/iommu/intel/iommu.c | 12 ++----------
>   1 file changed, 2 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 8096273b034c..e98f1b122b49 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -2963,7 +2963,7 @@ static void __init init_no_remapping_devices(void)
>   }
>   
>   #ifdef CONFIG_SUSPEND
> -static int init_iommu_hw(void)
> +static void init_iommu_hw(void)
>   {
>   	struct dmar_drhd_unit *drhd;
>   	struct intel_iommu *iommu = NULL;
> @@ -2988,8 +2988,6 @@ static int init_iommu_hw(void)
>   		iommu_enable_translation(iommu);
>   		iommu_disable_protect_mem_regions(iommu);
>   	}
> -
> -	return 0;

2966 static int init_iommu_hw(void)
2967 {
2968         struct dmar_drhd_unit *drhd;
2969         struct intel_iommu *iommu = NULL;
2970
2971         for_each_active_iommu(iommu, drhd)
2972                 if (iommu->qi)
2973                         dmar_reenable_qi(iommu);

dmar_reenable_qi() still possibly returns an error number. It's better
to pass this error number to the caller of init_iommu_hw()?

2974
2975         for_each_iommu(iommu, drhd) {
2976                 if (drhd->ignored) {

Best regards,
baolu