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

[cang@xxxxxxxxxxxxxx]

On 2019-12-17 01:39, Bart Van Assche wrote:
> On 12/16/19 6:31 AM, cang@xxxxxxxxxxxxxx wrote:
> > As SCSI host is allocated in ufshcd_platform_init() during platform
> > drive probe, it is much more appropriate if platform driver calls
> > ufshcd_dealloc_host() in their own drv->remove() path. How do you
> > think if I change it as below? If it is OK to you, please ignore my
> > previous mails.
> >
> > diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
> > index 3d4582e..ea45756 100644
> > --- a/drivers/scsi/ufs/ufs-qcom.c
> > +++ b/drivers/scsi/ufs/ufs-qcom.c
> > @@ -3239,6 +3239,7 @@ static int ufs_qcom_remove(struct 
> > platform_device *pdev)
> >
> >          pm_runtime_get_sync(&(pdev)->dev);
> >          ufshcd_remove(hba);
> > +       ufshcd_dealloc_host(hba);
> >          return 0;
> >   }
>
> Hi Can,
>
> Apparently some UFS drivers call ufshcd_remove() only and others
> (PCIe) call both ufshcd_remove() and ufshcd_dealloc_host(). I think
> that the above change will cause trouble for the PCIe driver unless
> the ufshcd_dealloc_host() call is removed from ufshcd_pci_remove().
>
> Thanks,
>
> Bart.

Hi Bart,

You may get me wrong. I mean we should do like what ufshcd-pci.c does.
As driver probe routine allocates SCSI host, then driver remove() should
de-allocate it. Meaning ufs_qcom_remove() should call both 
ufshcd_remove()
and ufshcd_dealloc_host().

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 3d4582e..ea45756 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -3239,6 +3239,7 @@ static int ufs_qcom_remove(struct platform_device 
*pdev)

          pm_runtime_get_sync(&(pdev)->dev);
          ufshcd_remove(hba);
 +       ufshcd_dealloc_host(hba);
          return 0;
   }

Thanks,

Can Guo.