linux-kernel - Re: [PATCH] i2c: qup: skip qup_i2c_suspend if the device is already runtime suspended

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Date:   Thu, 22 Sep 2016 20:09:28 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>
Subject: Re: [PATCH] i2c: qup: skip qup_i2c_suspend if the device is already
 runtime suspended

On Thu, Aug 25, 2016 at 12:23:39PM +0100, Sudeep Holla wrote:
> If the i2c device is already runtime suspended, if qup_i2c_suspend is
> executed during suspend-to-idle or suspend-to-ram it will result in the
> following splat:
> 
> WARNING: CPU: 3 PID: 1593 at drivers/clk/clk.c:476 clk_core_unprepare+0x80/0x90
> Modules linked in:
> 
> CPU: 3 PID: 1593 Comm: bash Tainted: G        W       4.8.0-rc3 #14
> Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
> PC is at clk_core_unprepare+0x80/0x90
> LR is at clk_unprepare+0x28/0x40
> pc : [<ffff0000086eecf0>] lr : [<ffff0000086f0c58>] pstate: 60000145
> Call trace:
>  clk_core_unprepare+0x80/0x90
>  qup_i2c_disable_clocks+0x2c/0x68
>  qup_i2c_suspend+0x10/0x20
>  platform_pm_suspend+0x24/0x68
>  dpm_run_callback.isra.7+0x1c/0x70
>  __device_suspend+0xf4/0x298
>  dpm_suspend+0x10c/0x228
>  dpm_suspend_start+0x68/0x78
>  suspend_devices_and_enter+0xb8/0x460
>  pm_suspend+0x1ec/0x240
>  state_store+0x84/0xf8
>  kobj_attr_store+0x14/0x28
>  sysfs_kf_write+0x48/0x58
>  kernfs_fop_write+0x15c/0x1f8
>  __vfs_write+0x1c/0x100
>  vfs_write+0x9c/0x1b8
>  SyS_write+0x44/0xa0
>  el0_svc_naked+0x24/0x28
> 
> This patch fixes the issue by executing qup_i2c_pm_suspend_runtime
> conditionally in qup_i2c_suspend.
> 
> Cc: Andy Gross <andy.gross@...aro.org>
> Cc: David Brown <david.brown@...aro.org>
> Cc: Wolfram Sang <wsa@...-dreams.de>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>

Applied to for-current, thanks!


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