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Subject: Re: [RFC PATCH 05/13] scsi: ufs: ufshpb: Disable HPB if no
 HPB-enabled luns
To:     Avri Altman <avri.altman@wdc.com>,
        "James E . J . Bottomley" <jejb@linux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@oracle.com>,
        linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     alim.akhtar@samsung.com, asutoshd@codeaurora.org,
        Zang Leigang <zangleigang@hisilicon.com>,
        Avi Shchislowski <avi.shchislowski@wdc.com>,
        Bean Huo <beanhuo@micron.com>, cang@codeaurora.org,
        stanley.chu@mediatek.com,
        MOHAMMED RAFIQ KAMAL BASHA <md.rafiq@samsung.com>,
        Sang-yoon Oh <sangyoon.oh@samsung.com>,
        yongmyung lee <ymhungry.lee@samsung.com>,
        Jinyoung CHOI <j-young.choi@samsung.com>
References: <1589538614-24048-1-git-send-email-avri.altman@wdc.com>
 <1589538614-24048-6-git-send-email-avri.altman@wdc.com>
From:   Bart Van Assche <bvanassche@acm.org>
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Message-ID: <abb03999-353a-77b3-b938-e4991f0ff920@acm.org>
Date:   Fri, 15 May 2020 19:02:20 -0700
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On 2020-05-15 03:30, Avri Altman wrote:
> @@ -368,6 +390,8 @@ int ufshpb_probe(struct ufs_hba *hba)
>  	if (ret)
>  		goto out;
>  
> +	INIT_DELAYED_WORK(&hba->hpb_disable_work, ufshpb_disable_work);
> +	schedule_delayed_work(&hba->hpb_disable_work, 60 * HZ);
>  out:
>  	kfree(dev_desc);
>  	if (ret) {

Calling INIT_DELAYED_WORK() just before schedule_delayed_work() is a bad
practice. If cancel_delayed_work() gets called before
INIT_DELAYED_WORK() then it will encounter something that it not
expects. If cancel_delayed_work() and INIT_DELAYED_WORK() get called
concurrently than that will trigger a race condition. It is better to
call INIT_DELAYED_WORK() from the context that allocates the data
structure in which the work structure is embedded.

Thanks,

Bart.