linux-kernel - Re: [PATCH] i2c: imx: correct the method of getting private data in notifier

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Message-ID: <20190423212119.GC5659@kunai>
Date:   Tue, 23 Apr 2019 23:21:19 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Anson Huang <anson.huang@....com>
Cc:     "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "wsa+renesas@...g-engineering.com" <wsa+renesas@...g-engineering.com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "eha@...f.com" <eha@...f.com>,
        "linux@...pel-privat.de" <linux@...pel-privat.de>,
        "mojha@...eaurora.org" <mojha@...eaurora.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        "peda@...ntia.se" <peda@...ntia.se>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH] i2c: imx: correct the method of getting private data in
 notifier_call

On Wed, Apr 17, 2019 at 01:59:34AM +0000, Anson Huang wrote:
> The way of getting private imx_i2c_struct in i2c_imx_clk_notifier_call()
> is incorrect, should use clk_change_nb element to get correct address
> and avoid below kernel dump during POST_RATE_CHANGE notify by clk
> framework:
> 
> Unable to handle kernel paging request at virtual address 03ef1488
> pgd = (ptrval)
> [03ef1488] *pgd=00000000
> Internal error: Oops: 5 [#1] PREEMPT SMP ARM
> Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
> Workqueue: events reduce_bus_freq_handler
> PC is at i2c_imx_set_clk+0x10/0xb8
> LR is at i2c_imx_clk_notifier_call+0x20/0x28
> pc : [<806a893c>]    lr : [<806a8a04>]    psr: a0080013
> sp : bf399dd8  ip : bf3432ac  fp : bf7c1dc0
> r10: 00000002  r9 : 00000000  r8 : 00000000
> r7 : 03ef1480  r6 : bf399e50  r5 : ffffffff  r4 : 00000000
> r3 : bf025300  r2 : bf399e50  r1 : 00b71b00  r0 : bf399be8
> Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
> Control: 10c5387d  Table: 4e03004a  DAC: 00000051
> Process kworker/2:1 (pid: 38, stack limit = 0x(ptrval))
> Stack: (0xbf399dd8 to 0xbf39a000)
> 9dc0:                                                       806a89e4 00000000
> 9de0: ffffffff bf399e50 00000002 806a8a04 806a89e4 80142900 ffffffff 00000000
> 9e00: bf34ef18 bf34ef04 00000000 ffffffff bf399e50 80142d84 00000000 bf399e6c
> 9e20: bf34ef00 80f214c4 bf025300 00000002 80f08d08 bf017480 00000000 80142df0
> 9e40: 00000000 80166ed8 80c27638 8045de58 bf352340 03ef1480 00b71b00 0f82e242
> 9e60: bf025300 00000002 03ef1480 80f60e5c 00000001 8045edf0 00000002 8045eb08
> 9e80: bf025300 00000002 03ef1480 8045ee10 03ef1480 8045eb08 bf01be40 00000002
> 9ea0: 03ef1480 8045ee10 07de2900 8045eb08 bf01b780 00000002 07de2900 8045ee10
> 9ec0: 80c27898 bf399ee4 bf020a80 00000002 1f78a400 8045ee10 80f60e5c 80460514
> 9ee0: 80f60e5c bf01b600 bf01b480 80460460 0f82e242 bf383a80 bf383a00 80f60e5c
> 9f00: 00000000 bf7c1dc0 80f60e70 80460564 80f60df0 80f60d24 80f60df0 8011e72c
> 9f20: 00000000 80f60df0 80f60e6c bf7c4f00 00000000 8011e7ac bf274000 8013bd84
> 9f40: bf7c1dd8 80f03d00 bf274000 bf7c1dc0 bf274014 bf7c1dd8 80f03d00 bf398000
> 9f60: 00000008 8013bfb4 00000000 bf25d100 bf25d0c0 00000000 bf274000 8013bf88
> 9f80: bf25d11c bf0cfebc 00000000 8014140c bf25d0c0 801412ec 00000000 00000000
> 9fa0: 00000000 00000000 00000000 801010e8 00000000 00000000 00000000 00000000
> 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
> [<806a893c>] (i2c_imx_set_clk) from [<806a8a04>] (i2c_imx_clk_notifier_call+0x20/0x28)
> [<806a8a04>] (i2c_imx_clk_notifier_call) from [<80142900>] (notifier_call_chain+0x44/0x84)
> [<80142900>] (notifier_call_chain) from [<80142d84>] (__srcu_notifier_call_chain+0x44/0x98)
> [<80142d84>] (__srcu_notifier_call_chain) from [<80142df0>] (srcu_notifier_call_chain+0x18/0x20)
> [<80142df0>] (srcu_notifier_call_chain) from [<8045de58>] (__clk_notify+0x78/0xa4)
> [<8045de58>] (__clk_notify) from [<8045edf0>] (__clk_recalc_rates+0x60/0xb4)
> [<8045edf0>] (__clk_recalc_rates) from [<8045ee10>] (__clk_recalc_rates+0x80/0xb4)
> Code: e92d40f8 e5903298 e59072a0 e1530001 (e5975008)

Applied to for-current, thanks!


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