linux-kernel - Re: [PATCH 1/4] scsi: ufs: Re-use device management locking code

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Message-ID: <f6045888-bb53-4ba2-90a9-98fc6a5254ad@acm.org>
Date: Tue, 5 Mar 2024 11:04:31 -0800
From: Bart Van Assche <bvanassche@....org>
To: Avri Altman <avri.altman@....com>,
 "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
 "Martin K . Petersen" <martin.petersen@...cle.com>
Cc: Bean Huo <beanhuo@...ron.com>, linux-scsi@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] scsi: ufs: Re-use device management locking code

On 3/4/24 01:23, Avri Altman wrote:
>   /**
>    * ufshcd_exec_dev_cmd - API for sending device management requests
>    * @hba: UFS hba
> @@ -3291,11 +3305,6 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
>   	struct ufshcd_lrb *lrbp;
>   	int err;
>   
> -	/* Protects use of hba->reserved_slot. */
> -	lockdep_assert_held(&hba->dev_cmd.lock);
> -
> -	down_read(&hba->clk_scaling_lock);
> -
>   	lrbp = &hba->lrb[tag];
>   	lrbp->cmd = NULL;
>   	err = ufshcd_compose_dev_cmd(hba, lrbp, cmd_type, tag);

Please restore the lockdep_assert_held() call.

> -	/* Protects use of hba->reserved_slot. */
> -	lockdep_assert_held(&hba->dev_cmd.lock);
> -
> -	down_read(&hba->clk_scaling_lock);
> -
>   	lrbp = &hba->lrb[tag];
>   	lrbp->cmd = NULL;
>   	lrbp->task_tag = tag;

Same comment here - please restore the lockdep_assert_held() call.

Otherwise this patch looks good to me.

Thanks,

Bart.