linux-kernel - Re: [PATCH 1/2] NTB: perf: Fix an error code in perf_setup

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Message-ID: <20210605180554.ql4rhpukj57ujkxw@mobilestation>
Date:   Sat, 5 Jun 2021 21:05:54 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Yang Li <yang.lee@...ux.alibaba.com>
Cc:     jdmason@...zu.us, dave.jiang@...el.com, allenbh@...il.com,
        linux-ntb@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] NTB: perf: Fix an error code in perf_setup_inbuf()

Hello Yang.

On Fri, Jun 04, 2021 at 06:20:50PM +0800, Yang Li wrote:
> When the function IS_ALIGNED() returns false, the value of ret is 0.
> So, we set ret to -ENOMEM to indicate this error.
> 
> Clean up smatch warning:
> drivers/ntb/test/ntb_perf.c:602 perf_setup_inbuf() warn: missing error
> code 'ret'.

Great catch! Thanks for posing the fix. Indeed ret would zero in case of
unaligned buffer allocation. Though such situation is very improbable.
A tiny nitpick below.

> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>
> ---
>  drivers/ntb/test/ntb_perf.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c
> index 89df135..c20b375 100644
> --- a/drivers/ntb/test/ntb_perf.c
> +++ b/drivers/ntb/test/ntb_perf.c
> @@ -598,6 +598,7 @@ static int perf_setup_inbuf(struct perf_peer *peer)
>  		return -ENOMEM;
>  	}
>  	if (!IS_ALIGNED(peer->inbuf_xlat, xlat_align)) {

> +		ret = -ENOMEM;

I'd set -EINVAL here. In this case we do have enough memory, but the
base address is unaligned in a way the NTB hw requires. After fixing
that feel free to add:
Reviewed-by: Serge Semin <fancer.lancer@...il.com>

-Sergey

>  		dev_err(&perf->ntb->dev, "Unaligned inbuf allocated\n");
>  		goto err_free_inbuf;
>  	}
> -- 
> 1.8.3.1
> 
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