From: Wang Dongsheng <Dongsheng.Wang@freescale.com>
To: "alexandre.belloni@free-electrons.com" 
	<alexandre.belloni@free-electrons.com>
CC: "a.zummo@towertech.it" <a.zummo@towertech.it>,
        "rtc-linux@googlegroups.com" <rtc-linux@googlegroups.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Wang Dongsheng <Dongsheng.Wang@freescale.com>
Subject: RE: [PATCH v2] rtc/ds3232: fix ds3232 get a WARNING trace in resume
 function
Thread-Topic: [PATCH v2] rtc/ds3232: fix ds3232 get a WARNING trace in resume
 function
Thread-Index: AQHQ1OABFRD73Ev3hUuoaA4P1DYwOJ4PzO7g
Date: Mon, 17 Aug 2015 07:10:35 +0000
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Hi Alexandre,

Could you apply this patch?

Regards,
-Dongsheng

> -----Original Message-----
> From: Dongsheng Wang [mailto:dongsheng.wang@freescale.com]
> Sent: Wednesday, August 12, 2015 5:14 PM
> To: alexandre.belloni@free-electrons.com
> Cc: a.zummo@towertech.it; rtc-linux@googlegroups.com; linux-
> kernel@vger.kernel.org; Wang Dongsheng-B40534
> Subject: [PATCH v2] rtc/ds3232: fix ds3232 get a WARNING trace in resume
> function
> 
> From: Wang Dongsheng <dongsheng.wang@freescale.com>
> 
> If ds3232 work on some platform that is not implementation
> irq_set_wake, ds3232 will get a WARNING trace in resume.
> So fix ds3232->suspended state to false when irq_set_irq_wake
> return error.
> 
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 729 at kernel/irq/manage.c:604
> irq_set_irq_wake+0x4b/0x8c()
> Unbalanced IRQ 201 wake disable
> Modules linked in:
> CPU: 0 PID: 729 Comm: sh Not tainted 3.12.19-rt30+ #25
> [<800107d9>] (unwind_backtrace+0x1/0x88) from [<8000e4ef>]
> (show_stack+0xb/0xc)
> [<8000e4ef>] (show_stack+0xb/0xc) from [<802b5fa9>]
> (dump_stack+0x4d/0x60)
> [<802b5fa9>] (dump_stack+0x4d/0x60) from [<800186dd>]
> (warn_slowpath_common+0x45/0x64)
> [<800186dd>] (warn_slowpath_common+0x45/0x64) from [<80018717>]
> (warn_slowpath_fmt+0x1b/0x24)
> [<80018717>] (warn_slowpath_fmt+0x1b/0x24) from [<8003a8d3>]
> (irq_set_irq_wake+0x4b/0x8c)
> [<8003a8d3>] (irq_set_irq_wake+0x4b/0x8c) from [<80204fcb>]
> (ds3232_resume+0x2d/0x36)
> [<80204fcb>] (ds3232_resume+0x2d/0x36) from [<801954c7>]
> (dpm_run_callback.isra.13+0xb/0x28)
> [<801954c7>] (dpm_run_callback.isra.13+0xb/0x28) from [<80195b1b>]
> (device_resume+0x7b/0xa2)
> [<80195b1b>] (device_resume+0x7b/0xa2) from [<80195f0f>]
> (dpm_resume+0xbb/0x19c)
> [<80195f0f>] (dpm_resume+0xbb/0x19c) from [<801960d9>]
> (dpm_resume_end+0x9/0x12)
> [<801960d9>] (dpm_resume_end+0x9/0x12) from [<80037e1d>]
> (suspend_devices_and_enter+0x17d/0x1d0)
> [<80037e1d>] (suspend_devices_and_enter+0x17d/0x1d0) from [<80037ee1>]
> (pm_suspend+0x71/0x128)
> [<80037ee1>] (pm_suspend+0x71/0x128) from [<80037449>]
> (state_store+0x6d/0x80)
> [<80037449>] (state_store+0x6d/0x80) from [<800af4d5>]
> (sysfs_write_file+0x9f/0xde)
> [<800af4d5>] (sysfs_write_file+0x9f/0xde) from [<8007a437>]
> (vfs_write+0x7b/0x104)
> [<8007a437>] (vfs_write+0x7b/0x104) from [<8007a7f7>]
> (SyS_write+0x27/0x48)
> [<8007a7f7>] (SyS_write+0x27/0x48) from [<8000c121>]
> (ret_fast_syscall+0x1/0x44)
> ---[ end trace 640959d2e8de6ccc ]---
> 
> Signed-off-by: Wang Dongsheng <dongsheng.wang@freescale.com>
> ---
> *v2*
> - Use dev_warn_once to instead of dev_info
> 
> diff --git a/drivers/rtc/rtc-ds3232.c b/drivers/rtc/rtc-ds3232.c
> index 7e48e53..3554970 100644
> --- a/drivers/rtc/rtc-ds3232.c
> +++ b/drivers/rtc/rtc-ds3232.c
> @@ -463,7 +463,10 @@ static int ds3232_suspend(struct device *dev)
> 
>  	if (device_can_wakeup(dev)) {
>  		ds3232->suspended = true;
> -		irq_set_irq_wake(client->irq, 1);
> +		if (irq_set_irq_wake(client->irq, 1)) {
> +			dev_warn_once(dev, "Can not set wakeup sources\n");
> +			ds3232->suspended = false;
> +		}
>  	}
> 
>  	return 0;
> --
> 2.1.0.27.g96db324

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