linux-kernel - Re: [PATCH] scsi: ufs: preventing bus hang crash during emergency power off

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Message-ID: <60c20e1f-ab07-4af9-b7ea-b199364c66d0@acm.org>
Date: Mon, 19 May 2025 08:31:56 -0700
From: Bart Van Assche <bvanassche@....org>
To: Bo Ye <bo.ye@...iatek.com>, Alim Akhtar <alim.akhtar@...sung.com>,
 Avri Altman <avri.altman@....com>,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
 "Martin K. Petersen" <martin.petersen@...cle.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: xiujuan.tan@...iatek.com, Qilin Tan <qilin.tan@...iatek.com>,
 linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] scsi: ufs: preventing bus hang crash during emergency
 power off

On 5/19/25 12:38 AM, Bo Ye wrote:
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 7735421e3991..a1013aea8e90 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -10262,6 +10262,7 @@ static void ufshcd_wl_shutdown(struct device *dev)
>   		scsi_device_set_state(sdev, SDEV_OFFLINE);
>   		mutex_unlock(&sdev->state_mutex);
>   	}
> +	ufshcd_wait_for_doorbell_clr(hba, 5 * USEC_PER_SEC);
>   	__ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM);
>   
>   	/*

UFS driver kernel patches should be prepared against Martin's for-next
branch. Commit a3a951064f7e ("scsi: ufs: Rework 
ufshcd_clock_scaling_prepare()") removed ufshcd_wait_for_doorbell_clr().

Please fix the build failure introduced by this patch.

Bart.