From: boris.brezillon@free-electrons.com (Boris Brezillon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 4/8] pwm: atmel-hlcdc: fix struct clk pointer comparing
Date: Thu, 26 Feb 2015 10:31:28 +0100 [thread overview]
Message-ID: <20150226103128.0b120742@bbrezillon> (raw)
In-Reply-To: <54EEE5EA.6000902@atmel.com>
Nicolas, Shawn,
On Thu, 26 Feb 2015 10:22:50 +0100
Nicolas Ferre <nicolas.ferre@atmel.com> wrote:
> Le 25/02/2015 15:53, Shawn Guo a ?crit :
> > Since commit 035a61c314eb ("clk: Make clk API return per-user struct clk
> > instances"), clk API users can no longer check if two struct clk
> > pointers are pointing to the same hardware clock, i.e. struct clk_hw, by
> > simply comparing two pointers. That's because with the per-user clk
> > change, a brand new struct clk is created whenever clients try to look
> > up the clock by calling clk_get() or sister functions like clk_get_sys()
> > and of_clk_get(). This changes the original behavior where the struct
> > clk is only created for once when clock driver registers the clock to
> > CCF in the first place. The net change here is before commit
> > 035a61c314eb the struct clk pointer is unique for given hardware
> > clock, while after the commit the pointers returned by clk lookup calls
> > become different for the same hardware clock.
> >
> > That said, the struct clk pointer comparing in the code doesn't work any
> > more. Call helper function clk_is_match() instead to fix the problem.
> >
> > Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
>
> I agree with the fix whichever name is chosen for the function in an
> future version of this series. So you can add my:
> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
>
> Maybe Boris can double check...
Looks good to me.
Thanks for fixing that.
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
>
> > ---
> > drivers/pwm/pwm-atmel-hlcdc.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
> > index 522f7075bb1a..36475949b829 100644
> > --- a/drivers/pwm/pwm-atmel-hlcdc.c
> > +++ b/drivers/pwm/pwm-atmel-hlcdc.c
> > @@ -97,7 +97,7 @@ static int atmel_hlcdc_pwm_config(struct pwm_chip *c,
> >
> > pwmcfg = ATMEL_HLCDC_PWMPS(pres);
> >
> > - if (new_clk != chip->cur_clk) {
> > + if (!clk_is_match(new_clk, chip->cur_clk)) {
> > u32 gencfg = 0;
> > int ret;
> >
> >
>
>
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
next prev parent reply other threads:[~2015-02-26 9:31 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-25 14:53 [PATCH 0/8] Fix struct clk pointer comparing Shawn Guo
2015-02-25 14:53 ` [PATCH 1/8] clk: add helper function clk_is_match() Shawn Guo
2015-02-25 17:27 ` Mike Turquette
2015-02-26 0:37 ` Shawn Guo
2015-02-26 9:02 ` [alsa-devel] " Ben Dooks
2015-02-26 9:56 ` Philipp Zabel
2015-02-26 11:25 ` Ben Dooks
2015-02-26 11:59 ` Ricard Wanderlof
2015-03-04 8:55 ` Geert Uytterhoeven
2015-03-04 9:51 ` Russell King - ARM Linux
2015-03-08 21:05 ` [PATCH] clk: provide clk_is_match() dummy for non-common clk Arnd Bergmann
2015-03-10 21:42 ` Geert Uytterhoeven
2015-03-11 7:09 ` Uwe Kleine-König
2015-03-11 10:22 ` Russell King - ARM Linux
2015-03-11 11:17 ` Uwe Kleine-König
2015-03-11 12:29 ` Russell King - ARM Linux
2015-03-12 0:35 ` Stephen Boyd
2015-02-25 14:53 ` [PATCH 2/8] ARM: imx: fix struct clk pointer comparing Shawn Guo
2015-02-25 14:53 ` [PATCH 3/8] drm: armada: " Shawn Guo
2015-02-25 14:53 ` [PATCH 4/8] pwm: atmel-hlcdc: " Shawn Guo
2015-02-26 9:22 ` Nicolas Ferre
2015-02-26 9:31 ` Boris Brezillon [this message]
2015-03-11 10:54 ` Thierry Reding
2015-02-25 14:53 ` [PATCH 5/8] serial: samsung: " Shawn Guo
2015-02-25 14:53 ` [PATCH 6/8] ASoC: fsl_esai: " Shawn Guo
2015-02-26 2:36 ` Mark Brown
2015-02-25 14:53 ` [PATCH 7/8] ASoC: fsl_spdif: " Shawn Guo
2015-02-25 21:04 ` Stephen Boyd
2015-02-26 1:17 ` Shawn Guo
2015-02-26 2:12 ` Mark Brown
2015-02-26 2:20 ` Shawn Guo
2015-02-26 2:29 ` Mark Brown
2015-02-26 2:36 ` Mark Brown
2015-02-25 14:53 ` [PATCH 8/8] ASoC: kirkwood: " Shawn Guo
2015-02-26 2:12 ` Mark Brown
2015-02-26 2:36 ` Mark Brown
2015-02-25 15:03 ` [PATCH 0/8] Fix " Russell King - ARM Linux
2015-02-25 17:55 ` Mike Turquette
2015-02-25 20:42 ` Stephen Boyd
2015-02-26 1:21 ` Shawn Guo
2015-02-26 1:24 ` Mike Turquette
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