linux-kernel - Re: [PATCH] mtk-sd: reset host->mrq on prepare

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Message-Id: <20250625172256.d1b4948e018fac55e575a49a@kernel.org>
Date: Wed, 25 Jun 2025 17:22:56 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Sergey Senozhatsky <senozhatsky@...omium.org>
Cc: Chaotian Jing <chaotian.jing@...iatek.com>, Ulf Hansson
 <ulf.hansson@...aro.org>, Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Masami Hiramatsu <mhiramat@...nel.org>, Tomasz Figa <tfiga@...omium.org>,
 linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] mtk-sd: reset host->mrq on prepare_data() error

On Wed, 25 Jun 2025 14:20:37 +0900
Sergey Senozhatsky <senozhatsky@...omium.org> wrote:

> Do not leave host with dangling ->mrq pointer if we hit
> the msdc_prepare_data() error out path.
> 
> Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>

Reviewed-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Thanks for fixing it.

> ---
>  drivers/mmc/host/mtk-sd.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index b12cfb9a5e5f..d7020e06dd55 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -1492,6 +1492,7 @@ static void msdc_ops_request(struct mmc_host *mmc, struct mmc_request *mrq)
>  	if (mrq->data) {
>  		msdc_prepare_data(host, mrq->data);
>  		if (!msdc_data_prepared(mrq->data)) {
> +			host->mrq = NULL;
>  			/*
>  			 * Failed to prepare DMA area, fail fast before
>  			 * starting any commands.
> -- 
> 2.50.0.714.g196bf9f422-goog
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>