From 394569928e2f17dff4ae367ac700048138e318c7 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Sat, 23 Apr 2016 04:02:05 -0300
Subject: Linux-libre 4.5.2-gnu
---
include/scsi/scsi_device.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
(limited to 'include/scsi')
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index f63a16760..ba93c0f69 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -513,6 +513,31 @@ static inline int scsi_device_tpgs(struct scsi_device *sdev)
return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
}
+/**
+ * scsi_device_supports_vpd - test if a device supports VPD pages
+ * @sdev: the &struct scsi_device to test
+ *
+ * If the 'try_vpd_pages' flag is set it takes precedence.
+ * Otherwise we will assume VPD pages are supported if the
+ * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
+ */
+static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
+{
+ /* Attempt VPD inquiry if the device blacklist explicitly calls
+ * for it.
+ */
+ if (sdev->try_vpd_pages)
+ return 1;
+ /*
+ * Although VPD inquiries can go to SCSI-2 type devices,
+ * some USB ones crash on receiving them, and the pages
+ * we currently ask for are for SPC-3 and beyond
+ */
+ if (sdev->scsi_level > SCSI_SPC_2 && !sdev->skip_vpd_pages)
+ return 1;
+ return 0;
+}
+
#define MODULE_ALIAS_SCSI_DEVICE(type) \
MODULE_ALIAS("scsi:t-" __stringify(type) "*")
#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
--
cgit v1.2.3-54-g00ecf