linux-kernel - Re: [PATCH 1/2] i3c: master: svc: change ENXIO to EAGAIN when IBI occurs during start frame

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Date: Mon, 6 May 2024 10:54:51 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Frank Li <Frank.Li@....com>
Cc: Conor Culhane <conor.culhane@...vaco.com>, Alexandre Belloni
 <alexandre.belloni@...tlin.com>, linux-i3c@...ts.infradead.org (moderated
 list:SILVACO I3C DUAL-ROLE MASTER), linux-kernel@...r.kernel.org (open
 list), imx@...ts.linux.dev
Subject: Re: [PATCH 1/2] i3c: master: svc: change ENXIO to EAGAIN when IBI
 occurs during start frame

Hi Frank,

Frank.Li@....com wrote on Wed, 24 Apr 2024 15:00:29 -0400:

> svc_i3c_master_xfer() returns error ENXIO if an In-Band Interrupt (IBI)
> occurs when the host starts the frame.
> 
> Change error code to EAGAIN to inform the client driver that this
> situation has occurred and to try again sometime later.

This changes slightly the user API, but feels legitimate at the same
time. Maybe a comment somewhere in the i3c headers to clarify this
possibility might be welcome?

> Fixes: 5e5e3c92e748 ("i3c: master: svc: fix wrong data return when IBI happen during start frame")
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/i3c/master/svc-i3c-master.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
> index 5ee4db68988e2..a2298ab460a37 100644
> --- a/drivers/i3c/master/svc-i3c-master.c
> +++ b/drivers/i3c/master/svc-i3c-master.c
> @@ -1080,7 +1080,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
>  	 * and yield the above events handler.
>  	 */
>  	if (SVC_I3C_MSTATUS_IBIWON(reg)) {
> -		ret = -ENXIO;
> +		ret = -EAGAIN;
>  		*actual_len = 0;
>  		goto emit_stop;
>  	}


Thanks,
Miquèl