linux-kernel - Re: [PATCH] remoteproc: elf_loader: fix loading segment when is

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Message-ID: <YNn17nA7CTaQLTrU@yoga>
Date:   Mon, 28 Jun 2021 11:16:46 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     ohad@...ery.com, mathieu.poirier@...aro.org,
        o.rempel@...gutronix.de, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        aisheng.dong@....com, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH] remoteproc: elf_loader: fix loading segment when
 is_iomem true

On Mon 28 Jun 02:06 CDT 2021, Peng Fan (OSS) wrote:

> From: Peng Fan <peng.fan@....com>
> 
> It seems luckliy work on i.MX platform, but it is wrong.
> Need use memcpy_toio, not memcpy_fromio.
> 
> Fixes: 40df0a91b2a52 ("remoteproc: add is_iomem to da_to_va")
> Tested-by: Dong Aisheng <aisheng.dong@....com> (i.MX8MQ)
> Reported-by: Dong Aisheng <aisheng.dong@....com>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/remoteproc/remoteproc_elf_loader.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c
> index 469c52e62faf..e8078efb3dec 100644
> --- a/drivers/remoteproc/remoteproc_elf_loader.c
> +++ b/drivers/remoteproc/remoteproc_elf_loader.c
> @@ -220,7 +220,7 @@ int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
>  		/* put the segment where the remote processor expects it */
>  		if (filesz) {
>  			if (is_iomem)
> -				memcpy_fromio(ptr, (void __iomem *)(elf_data + offset), filesz);
> +				memcpy_toio(ptr, (void __iomem *)(elf_data + offset), filesz);

Ouch, we should have caught that during the review, thanks for spotting
and fixing this.

That said, it's the ptr that's __iomem, so the cast should be on the
first parameter, not the second.

Regards,
Bjorn

>  			else
>  				memcpy(ptr, elf_data + offset, filesz);
>  		}
> -- 
> 2.30.0
>