linux-kernel - Re: [PATCH 1/1] scsi: ufs: core: Fix EH failure after wlun resume error

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Message-ID: <CA+=0d2ZpZkTw_2Wdnz4NKS3ZuoQHH5rESxKNkUNwkxdeM2tKMg@mail.gmail.com>
Date: Wed, 12 Nov 2025 17:29:34 +0800
From: Brian Kao <powenkao@...gle.com>
To: Peter Wang (王信友) <peter.wang@...iatek.com>
Cc: "beanhuo@...ron.com" <beanhuo@...ron.com>, "avri.altman@....com" <avri.altman@....com>, 
	"quic_nguyenb@...cinc.com" <quic_nguyenb@...cinc.com>, 
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>, "bvanassche@....org" <bvanassche@....org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"alim.akhtar@...sung.com" <alim.akhtar@...sung.com>, 
	"adrian.hunter@...el.com" <adrian.hunter@...el.com>, "mani@...nel.org" <mani@...nel.org>, 
	"James.Bottomley@...senPartnership.com" <James.Bottomley@...senpartnership.com>, 
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>
Subject: Re: [PATCH 1/1] scsi: ufs: core: Fix EH failure after wlun resume error

[RESEND using plain text]

Hi Peter,

This log actually is triggered by fault injection when wlun is suspended
echo 0xf > /sys/kernel/debug/ufshcd/3c2d0000.ufs/saved_uic_err

In a real-world scenario, this situation can occur when an error
interrupt calls `ufshcd_check_errors()`, which schedules the error
handler before the system reaches `ufshcd_set_dev_pwr_mode()`.

Thanks,
Brian


On Wed, Nov 12, 2025 at 5:18 PM Brian Kao <powenkao@...gle.com> wrote:
>
> Hi Peter,
>
> This log actually is triggered by fault injection when wlun is suspended
> echo 0xf > /sys/kernel/debug/ufshcd/3c2d0000.ufs/saved_uic_err
>
> In a real-world scenario, this situation can occur when an error interrupt calls `ufshcd_check_errors()`, which schedules the error handler before the system reaches `ufshcd_set_dev_pwr_mode()`.
>
> Thanks,
> Brian
>
>
> On Wed, Nov 12, 2025 at 4:17 PM Peter Wang (王信友) <peter.wang@...iatek.com> wrote:
>>
>> On Wed, 2025-11-12 at 06:32 +0000, Po-Wen Kao wrote:
>> >   google-ufshcd 3c2d0000.ufs: ufshcd_err_handler started; HBA state
>> > eh_fatal; ...
>> >   ufs_device_wlun 0:0:0:49488: START_STOP failed for power mode: 1,
>> > result 40000
>> >   ufs_device_wlun 0:0:0:49488: ufshcd_wl_runtime_resume failed: -5
>> >   ...
>> >   ufs_device_wlun 0:0:0:49488: runtime PM trying to activate child
>> > device 0:0:0:49488 but parent (target0:0:0) is not active
>> >
>>
>> Hi Brian,
>>
>> How is ufshcd_err_handler triggered before the parent device
>> resumes? I mean, what causes ufshcd_err_handler to be
>> triggered, an error interrupt or something else?
>>
>> Thanks
>> Peter
>>
>>
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