linux-kernel - Re: [PATCH] fsl/qe: ucc: copy and paste bug in ucc_get_tdm_sync

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Date:   Mon, 4 Jun 2018 14:06:45 +0200
From:   Mathieu Malaterre <malat@...ian.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     qiang.zhao@....com, kernel-janitors@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        LKML <linux-kernel@...r.kernel.org>, leoyang.li@....com
Subject: Re: [PATCH] fsl/qe: ucc: copy and paste bug in ucc_get_tdm_sync_shift()

Where did the original go ?

https://patchwork.ozlabs.org/patch/868158/


On Mon, Jun 4, 2018 at 2:02 PM Dan Carpenter <dan.carpenter@...cle.com> wrote:
>
> There is a copy and paste bug so we accidentally use the RX_ shift when
> we're in TX_ mode.
>
> Fixes: bb8b2062aff3 ("fsl/qe: setup clock source for TDM mode")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> Static analysis work.  Not tested.  This affects the success path, so
> we should probably test it.
>
> diff --git a/drivers/soc/fsl/qe/ucc.c b/drivers/soc/fsl/qe/ucc.c
> index c646d8713861..681f7d4b7724 100644
> --- a/drivers/soc/fsl/qe/ucc.c
> +++ b/drivers/soc/fsl/qe/ucc.c
> @@ -626,7 +626,7 @@ static u32 ucc_get_tdm_sync_shift(enum comm_dir mode, u32 tdm_num)
>  {
>         u32 shift;
>
> -       shift = (mode == COMM_DIR_RX) ? RX_SYNC_SHIFT_BASE : RX_SYNC_SHIFT_BASE;
> +       shift = (mode == COMM_DIR_RX) ? RX_SYNC_SHIFT_BASE : TX_SYNC_SHIFT_BASE;
>         shift -= tdm_num * 2;
>
>         return shift;