linux-kernel - Re: [PATCH] base: fix a missing check of clk

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Message-ID: <20181231172556.GA14092@amd>
Date:   Mon, 31 Dec 2018 18:25:56 +0100
From:   Pavel Machek <pavel@....cz>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     kjlu@....edu, pakki001@....edu,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] base: fix a missing check of clk_prepare

On Wed 2018-12-26 10:37:54, Rafael J. Wysocki wrote:
> On Wed, Dec 26, 2018 at 3:47 AM Kangjie Lu <kjlu@....edu> wrote:
> >
> > clk_prepare() could fail, so let's check its status, and if it fails,
> > issue an error message.
> >
> > Signed-off-by: Kangjie Lu <kjlu@....edu>
> > ---
> >  drivers/base/power/clock_ops.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
> > index 5a42ae4078c2..cb6144fb24e2 100644
> > --- a/drivers/base/power/clock_ops.c
> > +++ b/drivers/base/power/clock_ops.c
> > @@ -65,7 +65,9 @@ static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce)
> >         if (IS_ERR(ce->clk)) {
> >                 ce->status = PCE_STATUS_ERROR;
> >         } else {
> > -               clk_prepare(ce->clk);
> > +               if (clk_prepare(ce->clk))
> > +                       dev_err(dev, "clk_prepare failed.\n");
> 
> I'm not sure that this is useful.  The code continues regardless of
> the error anyway and it should at least set ce->status to
> PCE_STATUS_ERROR in the failing case.

Maybe this is not complete fix, but dev_err() is preferable to silent
failure.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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