From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To: "Andreas Färber" <afaerber@suse.de>
Cc: sboyd@kernel.org, ulf.hansson@linaro.org, robh+dt@kernel.org,
linux-arm-kernel@lists.infradead.org, linux-mmc@vger.kernel.org,
linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
thomas.liau@actions-semi.com, linux-actions@lists.infradead.org,
linus.walleij@linaro.org, linux-clk@vger.kernel.org
Subject: Re: [PATCH 1/7] clk: actions: Fix factor clk struct member access
Date: Mon, 10 Jun 2019 21:35:55 +0530 [thread overview]
Message-ID: <20190610160555.GB31461@mani> (raw)
In-Reply-To: <29ef33a9-f1f1-fe10-9288-8103714d40fa@suse.de>
Hi Andreas,
On Mon, Jun 10, 2019 at 03:36:42PM +0200, Andreas Färber wrote:
> Hi Mani,
>
> Am 08.06.19 um 21:53 schrieb Manivannan Sadhasivam:
> > Since the helper "owl_factor_helper_round_rate" is shared between factor
> > and composite clocks, using the factor clk specific helper function
> > like "hw_to_owl_factor" to access its members will create issues when
> > called from composite clk specific code. Hence, pass the "factor_hw"
> > struct pointer directly instead of fetching it using factor clk specific
> > helpers.
> >
> > This issue has been observed when a composite clock like "sd0_clk" tried
> > to call "owl_factor_helper_round_rate" resulting in pointer dereferencing
> > error.
> >
> > Fixes: 4bb78fc9744a ("clk: actions: Add factor clock support")
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > ---
> > drivers/clk/actions/owl-factor.c | 7 +++----
> > 1 file changed, 3 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/clk/actions/owl-factor.c b/drivers/clk/actions/owl-factor.c
> > index 317d4a9e112e..f419dfdd334f 100644
> > --- a/drivers/clk/actions/owl-factor.c
> > +++ b/drivers/clk/actions/owl-factor.c
> > @@ -64,11 +64,10 @@ static unsigned int _get_table_val(const struct clk_factor_table *table,
> > return val;
> > }
> >
> > -static int clk_val_best(struct clk_hw *hw, unsigned long rate,
> > +static int clk_val_best(const struct owl_factor_hw *factor_hw,
> > + struct clk_hw *hw, unsigned long rate,
> > unsigned long *best_parent_rate)
> > {
> > - struct owl_factor *factor = hw_to_owl_factor(hw);
> > - struct owl_factor_hw *factor_hw = &factor->factor_hw;
> > const struct clk_factor_table *clkt = factor_hw->table;
> > unsigned long parent_rate, try_parent_rate, best = 0, cur_rate;
> > unsigned long parent_rate_saved = *best_parent_rate;
> > @@ -126,7 +125,7 @@ long owl_factor_helper_round_rate(struct owl_clk_common *common,
> > const struct clk_factor_table *clkt = factor_hw->table;
> > unsigned int val, mul = 0, div = 1;
> >
> > - val = clk_val_best(&common->hw, rate, parent_rate);
> > + val = clk_val_best(factor_hw, &common->hw, rate, parent_rate);
> > _get_table_div_mul(clkt, val, &mul, &div);
> >
> > return *parent_rate * mul / div;
>
> While at it, I think it would be a good idea to rename it to
> owl_clk_val_best. Pretty confusing that you're touching only owl files
> for a clk_ refactoring, which sounds like common clk code.
>
Sure, will do.
Thanks,
Mani
> Regards,
> Andreas
>
> --
> SUSE Linux GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
> GF: Felix Imendörffer, Mary Higgins, Sri Rasiah
> HRB 21284 (AG Nürnberg)
next prev parent reply other threads:[~2019-06-10 16:06 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-08 19:53 [PATCH 0/7] Add SD/MMC driver for Actions Semi S900 SoC Manivannan Sadhasivam
2019-06-08 19:53 ` [PATCH 1/7] clk: actions: Fix factor clk struct member access Manivannan Sadhasivam
2019-06-10 13:36 ` Andreas Färber
2019-06-10 16:05 ` Manivannan Sadhasivam [this message]
2019-06-10 15:01 ` Stephen Boyd
2019-06-08 19:53 ` [PATCH 2/7] dt-bindings: mmc: Add Actions Semi SD/MMC/SDIO controller binding Manivannan Sadhasivam
2019-06-10 13:45 ` Andreas Färber
2019-06-10 16:04 ` Manivannan Sadhasivam
2019-07-09 2:16 ` Rob Herring
2019-06-08 19:53 ` [PATCH 3/7] arm64: dts: actions: Add MMC controller support for S900 Manivannan Sadhasivam
2019-06-08 19:53 ` [PATCH 4/7] arm64: dts: actions: Add uSD and eMMC support for Bubblegum96 Manivannan Sadhasivam
2019-06-10 14:08 ` Andreas Färber
2019-06-10 16:11 ` Manivannan Sadhasivam
2019-06-08 19:53 ` [PATCH 5/7] mmc: Add Actions Semi Owl SoCs SD/MMC driver Manivannan Sadhasivam
2019-07-22 13:41 ` Ulf Hansson
2019-08-21 2:26 ` Manivannan Sadhasivam
2019-06-08 19:53 ` [PATCH 6/7] MAINTAINERS: Add entry for Actions Semi SD/MMC driver and binding Manivannan Sadhasivam
2019-06-08 19:53 ` [PATCH 7/7] arm64: configs: Enable Actions Semi platform in defconfig Manivannan Sadhasivam
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