linux-kernel - Re: [PATCH v2 1/2] mmc: cqhci: fix space allocated for transfer descriptor

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Date:   Wed, 27 Feb 2019 15:11:04 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Alamy Liu <alamy.liu@...il.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Ritesh Harjani <riteshh@...eaurora.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "# 4.0+" <stable@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] mmc: cqhci: fix space allocated for transfer descriptor

On Mon, 25 Feb 2019 at 20:22, Alamy Liu <alamy.liu@...il.com> wrote:
>
> There is not enough space being allocated when DCMD is disabled.
>
> CQE_DCMD is not necessary to be enabled when CQE is enabled.
> (Software could halt CQE to send command)
>
> In the case that CQE_DCMD is not enabled, it still needs to allocate
> space for data transfer. For instance:
>   CQE_DCMD is enabled:  31 slots space (one slot used by DCMD)
>   CQE_DCMD is disabled: 32 slots space
>
> Fixes: a4080225f51d ("mmc: cqhci: support for command queue enabled host")
> Signed-off-by: Alamy Liu <alamy.liu@...il.com>

Applied for fixes and added a stable tag, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/cqhci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/cqhci.c b/drivers/mmc/host/cqhci.c
> index 4cc7863c13..974997b6cb 100644
> --- a/drivers/mmc/host/cqhci.c
> +++ b/drivers/mmc/host/cqhci.c
> @@ -202,7 +202,7 @@ static int cqhci_host_alloc_tdl(struct cqhci_host *cq_host)
>         cq_host->desc_size = cq_host->slot_sz * cq_host->num_slots;
>
>         cq_host->data_size = cq_host->trans_desc_len * cq_host->mmc->max_segs *
> -               (cq_host->num_slots - 1);
> +               cq_host->mmc->cqe_qdepth;
>
>         pr_debug("%s: cqhci: desc_size: %zu data_sz: %zu slot-sz: %d\n",
>                  mmc_hostname(cq_host->mmc), cq_host->desc_size, cq_host->data_size,
> --
> 2.17.1
>