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 09:48:01 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Marcos Paulo de Souza <marcos.souza.org@...il.com>
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 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;

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

Alan Stern