linux-kernel - RE: [PATCH] mmc: core: Fix WRITE

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Date:   Thu, 20 Oct 2022 13:03:20 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
CC:     "kernel@...s.com" <kernel@...s.com>,
        Jon Hunter <jonathanh@...dia.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] mmc: core: Fix WRITE_ZEROES CQE handling

> WRITE_ZEROES requests use TRIM, so mark them as needing to be issued
> synchronously even when a CQE is being used.  Without this,
> mmc_blk_mq_issue_rq() triggers a WARN_ON_ONCE() and fails the request
> since we don't have any handling for issuing this asynchronously.
> 
> Fixes: f7b6fc327327 ("mmc: core: Support zeroout using TRIM for eMMC")
> Reported-by: Jon Hunter <jonathanh@...dia.com>
> Tested-by: Jon Hunter <jonathanh@...dia.com>
> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
Reviewed-by: Avri Altman <avri.altman@....com>

> ---
>  drivers/mmc/core/queue.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c index
> fefaa901b50f..3661ba0bbc87 100644
> --- a/drivers/mmc/core/queue.c
> +++ b/drivers/mmc/core/queue.c
> @@ -48,6 +48,7 @@ static enum mmc_issue_type
> mmc_cqe_issue_type(struct mmc_host *host,
>         case REQ_OP_DRV_OUT:
>         case REQ_OP_DISCARD:
>         case REQ_OP_SECURE_ERASE:
> +       case REQ_OP_WRITE_ZEROES:
>                 return MMC_ISSUE_SYNC;
>         case REQ_OP_FLUSH:
>                 return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD :
> MMC_ISSUE_SYNC;
> --
> 2.28.0