linux-kernel - Re: [PATCH v2 1/2] cxl/mbox: Use correct handle in events debug message

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Message-ID: <20230804131612.0000770d@Huawei.com>
Date:   Fri, 4 Aug 2023 13:16:12 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Ira Weiny <ira.weiny@...el.com>
CC:     Davidlohr Bueso <dave@...olabs.net>,
        Dave Jiang <dave.jiang@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] cxl/mbox: Use correct handle in events debug
 message

On Tue, 01 Aug 2023 13:13:28 -0700
Ira Weiny <ira.weiny@...el.com> wrote:

> The handle value used to report an event being cleared by dev_dbg() is
> incorrect due to a post increment of the payload handle index.
> 
> Delay the increment of the index until after the print.
> 
> Fixes: 6ebe28f9ec72 ("cxl/mem: Read, trace, and clear events on driver load")
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> 

FWIW given how well this has already been reviewed.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
> Changes for v2
> [Dan] Go ahead and mark this for backporting
> [Dan] Remove 'To/Cc' cruft from individual patches
> [Dan/Alison] Split out the additional debugging
> [Alison] New oneliner
> ---
>  drivers/cxl/core/mbox.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
> index d6d067fbee97..a1c490f66bbf 100644
> --- a/drivers/cxl/core/mbox.c
> +++ b/drivers/cxl/core/mbox.c
> @@ -882,9 +882,10 @@ static int cxl_clear_event_record(struct cxl_memdev_state *mds,
>  	 */
>  	i = 0;
>  	for (cnt = 0; cnt < total; cnt++) {
> -		payload->handles[i++] = get_pl->records[cnt].hdr.handle;
> +		payload->handles[i] = get_pl->records[cnt].hdr.handle;
>  		dev_dbg(mds->cxlds.dev, "Event log '%d': Clearing %u\n", log,
>  			le16_to_cpu(payload->handles[i]));
> +		i++;
>  
>  		if (i == max_handles) {
>  			payload->nr_recs = i;
>