linux-kernel - 答复: [PATCH] mailbox: no error log in mbox_client

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Date:   Mon, 1 Jun 2020 06:56:51 +0000
From:   "Zhu, Joe" <Chunguang.Zhu@...isilicon.com>
To:     Jassi Brar <jassisinghbrar@...il.com>,
        "joe_zhuchg@....com" <joe_zhuchg@....com>
CC:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: 答复: [PATCH] mailbox: no error log in mbox_client_txdone() for tx done by irq

Hi Jassi,
  Client can not know how mailbox controller implements TX done. There is no API in mailbox_client.h to get this information.
  I think it is framework' responsibility, not client, to handle controller' different behavior. Thanks!

Regards,
Joe


-----邮件原件-----
发件人: Jassi Brar [mailto:jassisinghbrar@...il.com] 
发送时间: 2020年5月31日 4:25
收件人: joe_zhuchg@....com
抄送: Linux Kernel Mailing List; Zhu, Joe
主题: Re: [PATCH] mailbox: no error log in mbox_client_txdone() for tx done by irq

On Mon, May 11, 2020 at 12:52 AM <joe_zhuchg@....com> wrote:
>
> From: Joe Zhu <Chunguang.Zhu@...isilicon.com>
>
> client does not know and not care about how controller implement tx done.
> mbox_client_txdone() may be called when controller uses irq method.
>
> Signed-off-by: Joe Zhu <Chunguang.Zhu@...isilicon.com>
> ---
>  drivers/mailbox/mailbox.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
> index 0b821a5b2db8..116124adf188 100644
> --- a/drivers/mailbox/mailbox.c
> +++ b/drivers/mailbox/mailbox.c
> @@ -189,7 +189,9 @@ EXPORT_SYMBOL_GPL(mbox_chan_txdone);
>  void mbox_client_txdone(struct mbox_chan *chan, int r)
>  {
>         if (unlikely(!(chan->txdone_method & TXDONE_BY_ACK))) {
> -               dev_err(chan->mbox->dev, "Client can't run the TX ticker\n");
> +               if (unlikely(!(chan->txdone_method & TXDONE_BY_IRQ)))
> +                       dev_err(chan->mbox->dev,
> +                              "Client can't run the TX ticker\n");
>                 return;
>         }
If it is not by ACK, client should not call txdone() so we shout
immediately. Otherwise something is wrong.

thanks.