linux-kernel - RE: [EXT] [PATCH v1 1/6] scsi: ufs: Add device reset in link recovery path

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Date:   Sun, 3 Nov 2019 21:48:12 +0000
From:   "Bean Huo (beanhuo)" <beanhuo@...ron.com>
To:     Can Guo <cang@...eaurora.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "nguyenb@...eaurora.org" <nguyenb@...eaurora.org>,
        "rnayak@...eaurora.org" <rnayak@...eaurora.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>,
        "saravanak@...gle.com" <saravanak@...gle.com>,
        "salyzyn@...gle.com" <salyzyn@...gle.com>
CC:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Subhash Jadavani <subhashj@...eaurora.org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] [PATCH v1 1/6] scsi: ufs: Add device reset in link recovery
 path

Hi, Can Guo

> In order to recover from hibern8 exit failure, perform a reset in link recovery
> path before issuing link start-up.
> 
> Signed-off-by: Can Guo <cang@...eaurora.org>
> ---
>  drivers/scsi/ufs/ufshcd.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index
> c28c144..525f8e6 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -3859,6 +3859,9 @@ static int ufshcd_link_recovery(struct ufs_hba *hba)
>  	ufshcd_set_eh_in_progress(hba);
>  	spin_unlock_irqrestore(hba->host->host_lock, flags);
> 
> +	/* Reset the attached device */
> +	ufshcd_vops_device_reset(hba);
> +
>  	ret = ufshcd_host_reset_and_restore(hba);
> 
There is time consumption in reset,  It is true that reset can hide/solve some issues.
I don't know if you experienced issue resulting from an absent reset in this case mentioned in
Patch commit comment.

>  	spin_lock_irqsave(hba->host->host_lock, flags);
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project