[PATCH v2] storage: Fix bus scan and multi-LUN support for SCM eUSCSI devices

[Mark Knibbs <markk@xxxxxxxxxxx>]

This patch does two things for SCM eUSCSI USB-SCSI converters:

1. SCM eUSCSI bridge devices are hard-wired to use SCSI ID 7. On connecting
the converter, access to that ID is attempted during the bus scan. Asking
the converter to issue INQUIRY commands to itself isn't very polite and
wastes time. Set this_id to 7 so __scsi_scan_target() skips it in the scan.

2. Enable multi-LUN support. eUSCSI devices don't support Get Max LUN
requests, returning an error (-32). [Different targets could have different
numbers of LUNs, so it wouldn't make sense to return a particular value in
response to Get Max LUN.]

usb_stor_scan_dwork() does this:
    /* For bulk-only devices, determine the max LUN value */
    if (us->protocol == USB_PR_BULK && !(us->fflags & US_FL_SINGLE_LUN)) {
            mutex_lock(&us->dev_mutex);
            us->max_lun = usb_stor_Bulk_max_lun(us);
            mutex_unlock(&us->dev_mutex);

It avoids calling usb_stor_Bulk_max_lun() if US_FL_SINGLE_LUN, but not for
US_FL_SCM_MULT_TARG. Since usb_stor_Bulk_max_lun() returns 0 in the error
case, us->max_lun was always set to 0.

[If the user doesn't want multi-LUN support (perhaps there are SCSI devices
which respond to commands on all LUNs?), the US_FL_SINGLE_LUN quirk can be
specified on the kernel command line.]

Signed-off-by: Mark Knibbs <markk@xxxxxxxxxxx>

---
v2: Rebased on the usb-next branch of gregkh usb.git

diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index 9d66ce6..ac7bf91 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -884,7 +884,9 @@ static void usb_stor_scan_dwork(struct work_struct *work)
 	dev_dbg(dev, "starting scan\n");
 
 	/* For bulk-only devices, determine the max LUN value */
-	if (us->protocol == USB_PR_BULK && !(us->fflags & US_FL_SINGLE_LUN)) {
+	if (us->protocol == USB_PR_BULK &&
+	    !(us->fflags & US_FL_SINGLE_LUN) &&
+	    !(us->fflags & US_FL_SCM_MULT_TARG)) {
 		mutex_lock(&us->dev_mutex);
 		us->max_lun = usb_stor_Bulk_max_lun(us);
 		mutex_unlock(&us->dev_mutex);
@@ -983,13 +985,24 @@ int usb_stor_probe2(struct us_data *us)
 	usb_stor_dbg(us, "Transport: %s\n", us->transport_name);
 	usb_stor_dbg(us, "Protocol: %s\n", us->protocol_name);
 
+	if (us->fflags & US_FL_SCM_MULT_TARG) {
+		/*
+		 * SCM eUSCSI bridge devices can have different numbers
+		 * of LUNs on different targets; allow all to be probed.
+		 */
+		us->max_lun = 7;
+		/* The eUSCSI itself has ID 7, so avoid scanning that */
+		us_to_host(us)->this_id = 7;
+		/* max_id is 8 initially, so no need to set it here */
+	} else {
+		/* In the normal case there is only a single target */
+		us_to_host(us)->max_id = 1;
+	}
+
 	/* fix for single-lun devices */
 	if (us->fflags & US_FL_SINGLE_LUN)
 		us->max_lun = 0;
 
-	if (!(us->fflags & US_FL_SCM_MULT_TARG))
-		us_to_host(us)->max_id = 1;
-
 	/*
 	 * Like Windows, we won't store the LUN bits in CDB[1] for SCSI-2
 	 * devices using the Bulk-Only transport (even though this violates
--
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