linux-kernel - Re: [PATCH 2/4] i3c: master: svc: fix atomic issue

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Date:   Fri, 16 Jul 2021 00:52:05 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Clark Wang <xiaoning.wang@....com>
Cc:     conor.culhane@...vaco.com, alexandre.belloni@...tlin.com,
        vitor.soares@...opsys.com, boris.brezillon@...tlin.com,
        linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] i3c: master: svc: fix atomic issue

Hi Clark,

Clark Wang <xiaoning.wang@....com> wrote on Thu, 15 Jul 2021 16:24:11
+0800:

> do_daa_locked() function is in a spin lock environment, use
> readl_poll_timeout_atomic() to replace the origin
> readl_poll_timeout().
> 
> Signed-off-by: Clark Wang <xiaoning.wang@....com>
> ---
>  drivers/i3c/master/svc-i3c-master.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
> index c25a372f6820..9d80435638ea 100644
> --- a/drivers/i3c/master/svc-i3c-master.c
> +++ b/drivers/i3c/master/svc-i3c-master.c
> @@ -656,7 +656,7 @@ static int svc_i3c_master_readb(struct svc_i3c_master *master, u8 *dst,
>  	u32 reg;
>  
>  	for (i = 0; i < len; i++) {
> -		ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
> +		ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS, reg,
>  					 SVC_I3C_MSTATUS_RXPEND(reg), 0, 1000);

You forgot to align the parameters of the function here and below.

Otherwise,

Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>

>  		if (ret)
>  			return ret;
> @@ -687,7 +687,7 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master,
>  		 * Either one slave will send its ID, or the assignment process
>  		 * is done.
>  		 */
> -		ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
> +		ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS, reg,
>  					 SVC_I3C_MSTATUS_RXPEND(reg) |
>  					 SVC_I3C_MSTATUS_MCTRLDONE(reg),
>  					 1, 1000);
> @@ -744,7 +744,7 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master,
>  		}
>  
>  		/* Wait for the slave to be ready to receive its address */
> -		ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
> +		ret = readl_poll_timeout_atomic(master->regs + SVC_I3C_MSTATUS, reg,
>  					 SVC_I3C_MSTATUS_MCTRLDONE(reg) &&
>  					 SVC_I3C_MSTATUS_STATE_DAA(reg) &&
>  					 SVC_I3C_MSTATUS_BETWEEN(reg),




Thanks,
Miquèl