linux-kernel - Re: [PATCH] intel_th: Fix dma_map

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Date:   Fri, 26 Aug 2022 12:31:15 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Jack Wang <jinpu.wang@...os.com>,
        alexander.shishkin@...ux.intel.com
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] intel_th: Fix dma_map_sg error check

Le 26/08/2022 à 12:15, Jack Wang a écrit :
> dma_map_sg return 0 on error.
> 
> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Cc: linux-kernel@...r.kernel.org
> Fixes: 4e0eaf239fb3 ("intel_th: msu: Fix single mode with IOMMU")
> Signed-off-by: Jack Wang <jinpu.wang@...os.com>
> ---
>   drivers/hwtracing/intel_th/msu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hwtracing/intel_th/msu.c b/drivers/hwtracing/intel_th/msu.c
> index 6c8215a47a60..b49237d56a60 100644
> --- a/drivers/hwtracing/intel_th/msu.c
> +++ b/drivers/hwtracing/intel_th/msu.c
> @@ -931,7 +931,7 @@ static int msc_buffer_contig_alloc(struct msc *msc, unsigned long size)
>   
>   	ret = dma_map_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, 1,
>   			 DMA_FROM_DEVICE);
> -	if (ret < 0)
> +	if (!ret)

Missing ret = -EIO?
like in other patches?

CJ

>   		goto err_free_pages;
>   
>   	msc->nr_pages = nr_pages;