linux-kernel - Re: [PATCH v5 04/15] scsi: ufs: clear outstanding

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Date:	Tue, 27 Oct 2015 14:56:27 -0000
From:	"Gilad Broner" <gbroner@...eaurora.org>
To:	"Yaniv Gardi" <ygardi@...eaurora.org>
Cc:	robherring2@...il.com, james.bottomley@...senpartnership.com,
	pebolle@...cali.nl, hch@...radead.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, santoshsy@...il.com,
	linux-scsi-owner@...r.kernel.org, subhashj@...eaurora.org,
	ygardi@...eaurora.org, gbroner@...eaurora.org,
	draviv@...eaurora.org,
	"Vinayak Holikatti" <vinholikatti@...il.com>,
	"James E.J. Bottomley" <jbottomley@...n.com>
Subject: Re: [PATCH v5 04/15] scsi: ufs: clear outstanding_request bit in
 case query timeout

Reviewed-by: Gilad Broner <gbroner@...eaurora.org>

> When sending a query to the device returns with a timeout error,
> we clear the corresponding bit in the DOORBELL register but
> we don't clear the outstanding_request field as we should.
> This patch fixes this bug.
>
> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>
> ---
>  drivers/scsi/ufs/ufshcd.c | 22 ++++++++++++++++++++--
>  1 file changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 8860a57..e0b8755 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -364,6 +364,16 @@ static inline void ufshcd_utrl_clear(struct ufs_hba
> *hba, u32 pos)
>  }
>
>  /**
> + * ufshcd_outstanding_req_clear - Clear a bit in outstanding request
> field
> + * @hba: per adapter instance
> + * @tag: position of the bit to be cleared
> + */
> +static inline void ufshcd_outstanding_req_clear(struct ufs_hba *hba, int
> tag)
> +{
> +	__clear_bit(tag, &hba->outstanding_reqs);
> +}
> +
> +/**
>   * ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY
>   * @reg: Register value of host controller status
>   *
> @@ -1502,9 +1512,17 @@ static int ufshcd_wait_for_dev_cmd(struct ufs_hba
> *hba,
>
>  	if (!time_left) {
>  		err = -ETIMEDOUT;
> +		dev_dbg(hba->dev, "%s: dev_cmd request timedout, tag %d\n",
> +			__func__, lrbp->task_tag);
>  		if (!ufshcd_clear_cmd(hba, lrbp->task_tag))
> -			/* sucessfully cleared the command, retry if needed */
> +			/* successfully cleared the command, retry if needed */
>  			err = -EAGAIN;
> +		/*
> +		 * in case of an error, after clearing the doorbell,
> +		 * we also need to clear the outstanding_request
> +		 * field in hba
> +		 */
> +		ufshcd_outstanding_req_clear(hba, lrbp->task_tag);
>  	}
>
>  	return err;
> @@ -3942,7 +3960,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd)
>  	scsi_dma_unmap(cmd);
>
>  	spin_lock_irqsave(host->host_lock, flags);
> -	__clear_bit(tag, &hba->outstanding_reqs);
> +	ufshcd_outstanding_req_clear(hba, tag);
>  	hba->lrb[tag].cmd = NULL;
>  	spin_unlock_irqrestore(host->host_lock, flags);
>
> --
> 1.8.5.2
>
> --
> QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
> --
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>


-- 
Qualcomm Israel, on behalf of Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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