linux-kernel - Re: [PATCH v2 03/14] clk: imx: Fix division by zero warning on pfdv2

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Date:   Tue, 10 Mar 2020 13:53:25 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     peng.fan@....com
Cc:     s.hauer@...gutronix.de, sboyd@...nel.org, robh+dt@...nel.org,
        viresh.kumar@...aro.org, rjw@...ysocki.net, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, Anson.Huang@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        abel.vesa@....com
Subject: Re: [PATCH v2 03/14] clk: imx: Fix division by zero warning on pfdv2

On Wed, Feb 19, 2020 at 03:59:46PM +0800, peng.fan@....com wrote:
> From: Anson Huang <Anson.Huang@....com>
> 
> Fix below division by zero warning:
> 
> [    3.176443] Division by zero in kernel.
> [    3.181809] CPU: 0 PID: 88 Comm: kworker/0:2 Not tainted 5.3.0-rc2-next-20190730-63758-ge08da51-dirty #124
> [    3.191817] Hardware name: Freescale i.MX7ULP (Device Tree)
> [    3.197821] Workqueue: events dbs_work_handler
> [    3.202849] [<c01127d8>] (unwind_backtrace) from [<c010cd80>] (show_stack+0x10/0x14)
> [    3.211058] [<c010cd80>] (show_stack) from [<c0c77e68>] (dump_stack+0xd8/0x110)
> [    3.218820] [<c0c77e68>] (dump_stack) from [<c0c753c0>] (Ldiv0_64+0x8/0x18)
> [    3.226263] [<c0c753c0>] (Ldiv0_64) from [<c05984b4>] (clk_pfdv2_set_rate+0x54/0xac)
> [    3.234487] [<c05984b4>] (clk_pfdv2_set_rate) from [<c059192c>] (clk_change_rate+0x1a4/0x698)
> [    3.243468] [<c059192c>] (clk_change_rate) from [<c0591a08>] (clk_change_rate+0x280/0x698)
> [    3.252180] [<c0591a08>] (clk_change_rate) from [<c0591fc0>] (clk_core_set_rate_nolock+0x1a0/0x278)
> [    3.261679] [<c0591fc0>] (clk_core_set_rate_nolock) from [<c05920c8>] (clk_set_rate+0x30/0x64)
> [    3.270743] [<c05920c8>] (clk_set_rate) from [<c089cb88>] (imx7ulp_set_target+0x184/0x2a4)
> [    3.279501] [<c089cb88>] (imx7ulp_set_target) from [<c0896358>] (__cpufreq_driver_target+0x188/0x514)
> [    3.289196] [<c0896358>] (__cpufreq_driver_target) from [<c0899b0c>] (od_dbs_update+0x130/0x15c)
> [    3.298438] [<c0899b0c>] (od_dbs_update) from [<c089a5d0>] (dbs_work_handler+0x2c/0x5c)
> [    3.306914] [<c089a5d0>] (dbs_work_handler) from [<c0156858>] (process_one_work+0x2ac/0x704)
> [    3.315826] [<c0156858>] (process_one_work) from [<c0156cdc>] (worker_thread+0x2c/0x574)
> [    3.324404] [<c0156cdc>] (worker_thread) from [<c015cfe8>] (kthread+0x134/0x148)
> [    3.332278] [<c015cfe8>] (kthread) from [<c01010b4>] (ret_from_fork+0x14/0x20)
> [    3.339858] Exception stack(0xe82d5fb0 to 0xe82d5ff8)
> [    3.345314] 5fa0:                                     00000000 00000000 00000000 00000000
> [    3.353926] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [    3.362519] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> Signed-off-by: Peng Fan <peng.fan@....com>

Applied, thanks.