kern/97174: [umass] Y-E DATA USB-FDU quirk: no synchronize cache

[Ed Schouten]

>Number:         97174
>Category:       kern
>Synopsis:       [umass] Y-E DATA USB-FDU quirk: no synchronize cache
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri May 12 14:00:32 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Ed Schouten
>Release:        FreeBSD 7.0-CURRENT i386
>Organization:
n/a
>Environment:
FreeBSD zonk.fxq.nl 7.0-CURRENT FreeBSD 7.0-CURRENT #9: Fri May 12 14:16:32 CEST 2006     root at zonk.fxq.nl:/usr/obj/export/src/sys/ZONK  i386

>Description:
A few days ago I bought a floppy drive at MyCom (http://www.mycom.nl/);
a Y-E DATA USB-FDU. When connecting it to a FreeBSD box, the following
messages are shown:

| umass0: <Y-E DATA USB Floppy Drive, class 0/0, rev 1.10/6.01, addr 2> on uhub1
| da0 at umass-sim0 bus 0 target 0 lun 0
| da0: <Y-E DATA USB-FDU 6.01> Removable Direct Access SCSI-0 device 
| da0: 20KB/s transfers
| da0: 1MB (2880 512 byte sectors: 64H 32S/T 1C)
| umass0: Unsupported UFI command 0x35
| (da0:umass-sim0:0:0:0): Synchronize cache failed, status == 0x6, scsi status == 0x0
| umass0: Unsupported UFI command 0x35
| (da0:umass-sim0:0:0:0): Synchronize cache failed, status == 0x6, scsi status == 0x0
| umass0: Unsupported UFI command 0x35
| (da0:umass-sim0:0:0:0): Synchronize cache failed, status == 0x6, scsi status == 0x0

I do get a /dev/da0 entry. Mounting, reading, writing and dismounting
works properly.

>How-To-Repeat:
Connect a Y-E DATA USB-FDU to a machine running FreeBSD.

>Fix:
Below is a patch that disables cache synchronization on the device.

%%%
--- scsi_da.c	Fri May 12 14:19:20 2006
+++ scsi_da.c	Fri May 12 14:16:17 2006
@@ -443,6 +443,13 @@
 		{T_DIRECT, SIP_MEDIA_REMOVABLE, "Generic*", "STORAGE DEVICE*",
 		"*"}, /*quirks*/ DA_Q_NO_SYNC_CACHE
 	},
+	{
+		/*
+		 * Y-E DATA USB Floppy Drive
+		 */
+		{T_DIRECT, SIP_MEDIA_REMOVABLE, "Y-E DATA", "USB-FDU*",
+		"*"}, /*quirks*/ DA_Q_NO_SYNC_CACHE
+	},
 };
 
 static	disk_strategy_t	dastrategy;
%%%

When applying this patch, the messages are gone.

| umass0: <Y-E DATA USB Floppy Drive, class 0/0, rev 1.10/6.01, addr 4> on uhub1
| da0 at umass-sim0 bus 0 target 0 lun 0
| da0: <Y-E DATA USB-FDU 6.01> Removable Direct Access SCSI-0 device 
| da0: 20KB/s transfers
| da0: 1MB (2880 512 byte sectors: 64H 32S/T 1C)
| # mounted the device, read/wrote some files and dismounted it
| umass0: at uhub1 port 1 (addr 4) disconnected
| (da0:umass-sim0:0:0:0): lost device
| (da0:umass-sim0:0:0:0): removing device entry
| umass0: detached
>Release-Note:
>Audit-Trail:
>Unformatted: