linux-kernel - Re: [PATCH 2/2] usb: storage: scsiglue: Do not skip VPD if try_vpd

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Date:   Tue, 18 Jun 2019 12:17:39 -0300
From:   Marcos Paulo de Souza <marcos.souza.org@...il.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Kernel development list <linux-kernel@...r.kernel.org>,
        SCSI development list <linux-scsi@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:USB MASS STORAGE DRIVER" <linux-usb@...r.kernel.org>,
        "open list:USB MASS STORAGE DRIVER" 
        <usb-storage@...ts.one-eyed-alien.net>
Subject: Re: [PATCH 2/2] usb: storage: scsiglue: Do not skip VPD if
 try_vpd_pages is set

On Tue, Jun 18, 2019 at 09:48:01AM -0400, Alan Stern wrote:
> On Mon, 17 Jun 2019, Marcos Paulo de Souza wrote:
> 
> > If BLIST_TRY_VPD_PAGES is set for a device, even for an USB, it should
> > be honored, so only set skip_vpd_pages is try_vpd_pages is not set.
> > 
> > Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@...il.com>
> > ---
> >  drivers/usb/storage/scsiglue.c | 7 +++++--
> >  1 file changed, 5 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
> > index 59190d88fa9f..0a9520780771 100644
> > --- a/drivers/usb/storage/scsiglue.c
> > +++ b/drivers/usb/storage/scsiglue.c
> > @@ -195,8 +195,11 @@ static int slave_configure(struct scsi_device *sdev)
> >  		 */
> >  		sdev->skip_ms_page_8 = 1;
> >  
> > -		/* Some devices don't handle VPD pages correctly */
> > -		sdev->skip_vpd_pages = 1;
> > +		/*
> > +		 * Some devices don't handle VPD pages correctly, so skip vpd
> > +		 * pages if not forced by SCSI layer.
> > +		 */
> > +		sdev->skip_vpd_pages = sdev->try_vpd_pages == 0;
> >  
> >  		/* Do not attempt to use REPORT SUPPORTED OPERATION CODES */
> >  		sdev->no_report_opcodes = 1;
> 
> Acked-by: Alan Stern <stern@...land.harvard.edu>
> 
> Although I think it would be clearer to write:
> 
> 		sdev->skip_vpd_pages = !sdev->try_vpd_pages;

I agree. Greg, would you like me to send a v2 of this patch with this change, or
can you apply the change suggested by Alan?

Thanks,
Marcos

> 
> But that's just personal preference.  This is okay as it is.
> 
> Alan Stern
> 

-- 
Thanks,
Marcos