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

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Message-ID: <15a802cf-4969-f174-1e5d-1e65f3ff6885@intel.com>
Date:   Tue, 1 Aug 2023 13:41:10 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     Ira Weiny <ira.weiny@...el.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Dan Williams" <dan.j.williams@...el.com>
CC:     <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 8/1/23 13:13, Ira Weiny 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>

Reviewed-by: Dave Jiang <dave.jiang@...el.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;
>