linux-kernel - Re: [PATCH] net: gianfar_ptp: move set_fipers() to spinlock protecting area

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Message-ID: <20180109033918.gi2m6khssnddiat3@localhost>
Date:   Mon, 8 Jan 2018 19:39:18 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Yangbo Lu <yangbo.lu@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        netdev@...r.kernel.org, linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: gianfar_ptp: move set_fipers() to spinlock
 protecting area

On Mon, Jan 08, 2018 at 10:53:40AM -0200, Fabio Estevam wrote:
> On Mon, Jan 8, 2018 at 8:13 AM, Yangbo Lu <yangbo.lu@....com> wrote:
> > set_fipers() calling should be protected by spinlock.
> > This patch is to move set_fipers() to spinlock protecting
> > area in ptp_gianfar_adjtime() function.
> 
> It would be nice to explay why.

Maybe this is important?

/* Caller must hold etsects->lock. */
static void set_fipers(struct etsects *etsects)
{
	set_alarm(etsects);
	gfar_write(&etsects->regs->tmr_fiper1, etsects->tmr_fiper1);
	gfar_write(&etsects->regs->tmr_fiper2, etsects->tmr_fiper2);
}

Thanks,
Richard