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From: Trent Piepho <trent.piepho@igorinstitute.com>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Barebox List <barebox@lists.infradead.org>,
	Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: Re: [PATCH 11/24] Add rational_best_approximation()
Date: Wed, 2 Jun 2021 11:25:29 -0700	[thread overview]
Message-ID: <CAMHeXxNPhA29-Yv9_bDGVJRW-Q7Dcm4juY9EqCrHv0cK0N8fpg@mail.gmail.com> (raw)
In-Reply-To: <20210602095507.24609-12-s.hauer@pengutronix.de>

On Wed, Jun 2, 2021 at 3:05 AM Sascha Hauer <s.hauer@pengutronix.de> wrote:
>
> Import rational_best_approximation() from Linux. This is used by an
> upcoming update of the clk_fractional_divider code.

> +               if ((n2 > max_numerator) || (d2 > max_denominator)) {
> +                       unsigned long t = min((max_numerator - n0) / n1,
> +                                             (max_denominator - d0) / d1);
> +

There is a divide by zero bug in this version if the input is greater
than the largest value allowed or less than the smallest non-zero
value allowed.  I sent a patch to lkml for this a week ago,
https://lore.kernel.org/patchwork/patch/1436255/

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  reply	other threads:[~2021-06-02 18:27 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-02  9:54 [PATCH v2 00/24] clk updates Sascha Hauer
2021-06-02  9:54 ` [PATCH 01/24] clk: clk-mux: Fix handling of CLK_MUX_HIWORD_MASK Sascha Hauer
2021-06-02 15:18   ` Ahmad Fatoum
2021-06-02  9:54 ` [PATCH 02/24] clk: introduce clk init op Sascha Hauer
2021-06-02  9:54 ` [PATCH 03/24] clk: rename clk_register() to bclk_register() Sascha Hauer
2021-06-02  9:54 ` [PATCH 04/24] clk: introduce struct clk_hw Sascha Hauer
2021-06-11  7:55   ` Ahmad Fatoum
2021-06-11  8:41     ` Sascha Hauer
2021-06-11  9:19       ` Ahmad Fatoum
2021-06-11 11:46         ` Sascha Hauer
2021-06-11 12:14           ` Ahmad Fatoum
2021-06-02  9:54 ` [PATCH 05/24] clk: introduce clk_register() Sascha Hauer
2021-06-02  9:54 ` [PATCH 06/24] clk: divider: Make clk_divider_ops const Sascha Hauer
2021-06-02  9:54 ` [PATCH 07/24] clk: divider: Add ro ops Sascha Hauer
2021-06-02  9:54 ` [PATCH 08/24] clk: divider: Make clk_mux_ops const Sascha Hauer
2021-06-02  9:54 ` [PATCH 09/24] clk: mux: Add ro ops Sascha Hauer
2021-06-02  9:54 ` [PATCH 10/24] clk: move fixed_factor to include/linux/clk.h Sascha Hauer
2021-06-02  9:54 ` [PATCH 11/24] Add rational_best_approximation() Sascha Hauer
2021-06-02 18:25   ` Trent Piepho [this message]
2021-06-07 11:22     ` Sascha Hauer
2021-06-02  9:54 ` [PATCH 12/24] clk: Update fractional divider from Linux Sascha Hauer
2021-06-02  9:54 ` [PATCH 13/24] clk: Add lock to different clock types Sascha Hauer
2021-06-02  9:54 ` [PATCH 14/24] clk: Add Linux functions to register a divider Sascha Hauer
2021-06-02  9:54 ` [PATCH 15/24] clk: Add Linux functions to register a fixed factor clock Sascha Hauer
2021-06-02  9:54 ` [PATCH 16/24] clk: Add Linux functions to register a gate Sascha Hauer
2021-06-02  9:55 ` [PATCH 17/24] clk: Add Linux functions to register a mux Sascha Hauer
2021-06-02  9:55 ` [PATCH 18/24] clk: Add CLK_GET_RATE_NOCACHE Sascha Hauer
2021-06-02  9:55 ` [PATCH 19/24] clk: Rename CLK_GATE_INVERTED to CLK_GATE_SET_TO_DISABLE Sascha Hauer
2021-06-02  9:55 ` [PATCH 20/24] clk: implement CLK_SET_RATE_UNGATE Sascha Hauer
2021-06-02  9:55 ` [PATCH 21/24] clk: implement set/get phase Sascha Hauer
2021-06-02  9:55 ` [PATCH 22/24] regmap: Add regmap_read_poll_timeout Sascha Hauer
2021-06-02  9:55 ` [PATCH 23/24] clk: rockchip: Update to current Linux Sascha Hauer
2021-06-02  9:55 ` [PATCH 24/24] clk: Rockchip: Add rk3568 clk support Sascha Hauer
2021-06-09  9:18   ` Ahmad Fatoum

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