Re: [PATCH 1/2] scsi: ufs: Put SCSI host after remove it

[Bart Van Assche]

On 12/14/19 8:03 AM, Can Guo wrote:
> In ufshcd_remove(), after SCSI host is removed, put it once so that its
> resources can be released.
>
> Signed-off-by: Can Guo <cang@xxxxxxxxxxxxxx>
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index b5966fa..a86b0fd 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -8251,6 +8251,7 @@ void ufshcd_remove(struct ufs_hba *hba)
>   	ufs_bsg_remove(hba);
>   	ufs_sysfs_remove_nodes(hba->dev);
>   	scsi_remove_host(hba->host);
> +	scsi_host_put(hba->host);
>   	/* disable interrupts */
>   	ufshcd_disable_intr(hba, hba->intr_mask);
>   	ufshcd_hba_stop(hba, true);

Hi Can,

The UFS driver may queue work asynchronously and that asynchronous work 
may refer to the SCSI host, e.g. ufshcd_err_handler(). Is it guaranteed 
that all that asynchronous work has finished before scsi_host_put() is 
called?

Thanks,

Bart.