Re: [PATCH 2/2] scsi: ufs: Protect PM ops and err_handler from user access through sysfs

[Bean Huo <huobean@gmail.com>]

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;