From: Vadim Fedorenko <vfedorenko@novek.ru>
To: Jonathan Lemon <jonathan.lemon@gmail.com>, netdev@vger.kernel.org
Cc: richardcochran@gmail.com, kernel-team@fb.com,
davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com
Subject: Re: [PATCH net] ptp: ocp: have adjtime handle negative delta_ns correctly
Date: Sat, 7 May 2022 01:19:54 +0100 [thread overview]
Message-ID: <a07b0326-19c7-5756-106c-28b52975871d@novek.ru> (raw)
In-Reply-To: <20220505234050.3378-1-jonathan.lemon@gmail.com>
On 06.05.2022 00:40, Jonathan Lemon wrote:
> delta_ns is a s64, but it was being passed ptp_ocp_adjtime_coarse
> as an u64. Also, it turns out that timespec64_add_ns() only handles
> positive values, so the math needs to be updated.
>
> Fix by passing in the correct signed value, then adding to a
> nanosecond version of the timespec.
>
> Fixes: '90f8f4c0e3ce ("ptp: ocp: Add ptp_ocp_adjtime_coarse for large adjustments")'
> Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
> ---
> drivers/ptp/ptp_ocp.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
> index dd45471f6780..65e592ec272e 100644
> --- a/drivers/ptp/ptp_ocp.c
> +++ b/drivers/ptp/ptp_ocp.c
> @@ -841,16 +841,18 @@ __ptp_ocp_adjtime_locked(struct ptp_ocp *bp, u32 adj_val)
> }
>
> static void
> -ptp_ocp_adjtime_coarse(struct ptp_ocp *bp, u64 delta_ns)
> +ptp_ocp_adjtime_coarse(struct ptp_ocp *bp, s64 delta_ns)
> {
> struct timespec64 ts;
> unsigned long flags;
> int err;
> + s64 ns;
>
> spin_lock_irqsave(&bp->lock, flags);
> err = __ptp_ocp_gettime_locked(bp, &ts, NULL);
> if (likely(!err)) {
> - timespec64_add_ns(&ts, delta_ns);
> + ns = timespec64_to_ns(&ts) + delta_ns;
> + ts = ns_to_timespec64(ns);
Maybe use set_normalized_timespec64 instead of this ugly transformations and
additional variable?
> __ptp_ocp_settime_locked(bp, &ts);
> }
> spin_unlock_irqrestore(&bp->lock, flags);
next prev parent reply other threads:[~2022-05-07 0:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-05 23:40 [PATCH net] ptp: ocp: have adjtime handle negative delta_ns correctly Jonathan Lemon
2022-05-07 0:19 ` Vadim Fedorenko [this message]
2022-05-08 4:55 ` Jonathan Lemon
2022-05-09 1:22 ` Vadim Fedorenko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=a07b0326-19c7-5756-106c-28b52975871d@novek.ru \
--to=vfedorenko@novek.ru \
--cc=davem@davemloft.net \
--cc=jonathan.lemon@gmail.com \
--cc=kernel-team@fb.com \
--cc=kuba@kernel.org \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=richardcochran@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).