linux-kernel - Re: [PATCH 2/3] dmaengine: dw-axi-dmac: do not print NULL LLI during error

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Message-ID: <YtlHj2f9biaFEK+m@matsya>
Date:   Thu, 21 Jul 2022 18:03:19 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Ben Dooks <ben.dooks@...ive.com>
Cc:     dmaengine@...r.kernel.org, Eugeniy.Paltsev@...opsys.com,
        linux-kernel@...r.kernel.org,
        Sudip Mukherjee <sudip.mukherjee@...ive.com>,
        Jude Onyenegecha <jude.onyenegecha@...ive.com>
Subject: Re: [PATCH 2/3] dmaengine: dw-axi-dmac: do not print NULL LLI during
 error

On 08-07-22, 18:01, Ben Dooks wrote:
> During debugging we have seen an issue where axi_chan_dump_lli()
> is passed a NULL LLI pointer which ends up causing an OOPS due
> to trying to get fields from it. Simply print NULL LLI and exit
> to avoid this.

Applied, thanks

> 
> Signed-off-by: Ben Dooks <ben.dooks@...ive.com>
> ---
>  drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
> index 75c537153e92..d6ef5f49f281 100644
> --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
> +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
> @@ -1008,6 +1008,11 @@ static void axi_chan_dump_regs(struct axi_dma_chan *chan)
>  static void axi_chan_dump_lli(struct axi_dma_chan *chan,
>  			      struct axi_dma_hw_desc *desc)
>  {
> +	if (!desc->lli) {
> +		dev_err(dchan2dev(&chan->vc.chan), "NULL LLI\n");
> +		return;
> +	}
> +
>  	dev_err(dchan2dev(&chan->vc.chan),
>  		"SAR: 0x%llx DAR: 0x%llx LLP: 0x%llx BTS 0x%x CTL: 0x%x:%08x",
>  		le64_to_cpu(desc->lli->sar),
> -- 
> 2.35.1

-- 
~Vinod