linux-kernel - [PATCH v2] usb: storage: scsiglue: Do not skip VPD if try_vpd

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Message-Id: <20190618224454.16595-1-marcos.souza.org@gmail.com>
Date:   Tue, 18 Jun 2019 19:44:54 -0300
From:   Marcos Paulo de Souza <marcos.souza.org@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Marcos Paulo de Souza <marcos.souza.org@...il.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org (open list:USB MASS STORAGE DRIVER),
        usb-storage@...ts.one-eyed-alien.net (open list:USB MASS STORAGE DRIVER)
Subject: [PATCH v2] usb: storage: scsiglue: Do not skip VPD if try_vpd_pages is set

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>
Acked-by: Alan Stern <stern@...land.harvard.edu>
---

 Changes from v1:
 changed the check of try_vpd_pages from:
 	sdev->try_vpd_pages == 0;
 to:
 	!sdev->try_vpd_pages;
 (as suggested by Alan Stern)

 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..30790240aec6 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;
 
 		/* Do not attempt to use REPORT SUPPORTED OPERATION CODES */
 		sdev->no_report_opcodes = 1;
-- 
2.21.0