linux-kernel - Re: [PATCH] iommu: dart: Use readl instead of readl

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <94634407-9bbd-4f2d-9d0f-4f02cdfadfa5@marcan.st>
Date:   Mon, 27 Nov 2023 14:59:00 +0900
From:   Hector Martin <marcan@...can.st>
To:     Sven Peter <sven@...npeter.dev>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     Alyssa Rosenzweig <alyssa@...enzweig.io>, asahi@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu: dart: Use readl instead of readl_relaxed for
 consistency

On 2023/11/27 1:20, Sven Peter wrote:
> While the readl_relaxed in apple_dart_suspend is correct the rest of the
> driver uses the non-relaxed variants everywhere and the single
> readl_relaxed is inconsistent and possibly confusing.
> 
> Signed-off-by: Sven Peter <sven@...npeter.dev>
> ---
>  drivers/iommu/apple-dart.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
> index 59cf256bf40f..c7f047ce0a7a 100644
> --- a/drivers/iommu/apple-dart.c
> +++ b/drivers/iommu/apple-dart.c
> @@ -1272,7 +1272,7 @@ static __maybe_unused int apple_dart_suspend(struct device *dev)
>  	unsigned int sid, idx;
>  
>  	for (sid = 0; sid < dart->num_streams; sid++) {
> -		dart->save_tcr[sid] = readl_relaxed(dart->regs + DART_TCR(dart, sid));
> +		dart->save_tcr[sid] = readl(dart->regs + DART_TCR(dart, sid));
>  		for (idx = 0; idx < dart->hw->ttbr_count; idx++)
>  			dart->save_ttbr[sid][idx] =
>  				readl(dart->regs + DART_TTBR(dart, sid, idx));

Acked-by: Hector Martin <marcan@...can.st>

- Hector