linux-kernel - Re: [PATCH 2/2] scsi: ufs: Protect PM ops and err

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Message-ID: <80a15afab8024d0b61d312b57585c9322ac91958.camel@gmail.com>
Date:   Mon, 04 Jan 2021 21:05:09 +0100
From:   Bean Huo <huobean@...il.com>
To:     Can Guo <cang@...eaurora.org>, asutoshd@...eaurora.org,
        nguyenb@...eaurora.org, hongwus@...eaurora.org,
        ziqichen@...eaurora.org, rnayak@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        saravanak@...gle.com, salyzyn@...gle.com,
        "rjw@...ysocki.net" <rjw@...ysocki.net>
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Nitin Rawat <nitirawa@...eaurora.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Bart Van Assche <bvanassche@....org>,
        Satya Tangirala <satyat@...gle.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] scsi: ufs: Protect PM ops and err_handler from user
 access through sysfs

On Sat, 2021-01-02 at 05:59 -0800, Can Guo wrote:
> + * @shutting_down: flag to check if shutdown has been invoked

I am not much sure if this flag is need, since once PM going in
shutdown path, what will be returnded by pm_runtime_get_sync()? 

If pm_runtime_get_sync() will fail, just check its return.

Hi Rafael
would you please help us confirm this?

thanks,
Bean


> + * @host_sem: semaphore used to serialize concurrent contexts
>   * @eh_wq: Workqueue that eh_work works on
>   * @eh_work: Worker to handle UFS errors that require s/w attention
>   * @eeh_work: Worker to handle exception events
> @@ -751,7 +753,8 @@ struct ufs_hba {
>         u32 intr_mask;
>         u16 ee_ctrl_mask;
>         bool is_powered;
> -       struct semaphore eh_sem;
> +       bool shutting_down;
> +       struct semaphore host_sem;