[PATCH] USB Storage: US_FL_MAX_SECTORS_64 flag

This patch adds a US_FL_MAX_SECTORS_64 and removes the Genesys special-cases
for this that were in scsiglue.c. It also adds the flag to other devices
reported to need it.
Signed-off-by: Phil Dibowitz <phil@ipom.com>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/storage/scsiglue.c

@@ -112,13 +112,11 @@ static int slave_configure(struct scsi_device *sdev)
 	if (sdev->scsi_level < SCSI_2)
 		sdev->scsi_level = sdev->sdev_target->scsi_level = SCSI_2;
 
-	/* According to the technical support people at Genesys Logic,
-	 * devices using their chips have problems transferring more than
-	 * 32 KB at a time.  In practice people have found that 64 KB
-	 * works okay and that's what Windows does.  But we'll be
-	 * conservative; people can always use the sysfs interface to
-	 * increase max_sectors. */
-	if (le16_to_cpu(us->pusb_dev->descriptor.idVendor) == USB_VENDOR_ID_GENESYS &&
+	/* Many devices have trouble transfering more than 32KB at a time,
+	 * while others have trouble with more than 64K. At this time we
+	 * are limiting both to 32K (64 sectores).
+	 */
+	if ((us->flags & US_FL_MAX_SECTORS_64) &&
 			sdev->request_queue->max_sectors > 64)
 		blk_queue_max_sectors(sdev->request_queue, 64);
 

drivers/usb/storage/unusual_devs.h

@@ -715,18 +715,22 @@ UNUSUAL_DEV(  0x05dc, 0xb002, 0x0000, 0x0113,
  * They were originally reported by Alexander Oltu
  * <alexander@all-2.com> and Peter Marks <peter.marks@turner.com>
  * respectively.
+ *
+ * US_FL_GO_SLOW and US_FL_MAX_SECTORS_64 added by Phil Dibowitz
+ * <phil@ipom.com> as these flags were made and hard-coded
+ * special-cases were pulled from scsiglue.c.
  */
 UNUSUAL_DEV(  0x05e3, 0x0701, 0x0000, 0xffff,
 		"Genesys Logic",
 		"USB to IDE Optical",
 		US_SC_DEVICE, US_PR_DEVICE, NULL,
-		US_FL_GO_SLOW ),
+		US_FL_GO_SLOW | US_FL_MAX_SECTORS_64 ),
 
 UNUSUAL_DEV(  0x05e3, 0x0702, 0x0000, 0xffff,
 		"Genesys Logic",
 		"USB to IDE Disk",
 		US_SC_DEVICE, US_PR_DEVICE, NULL,
-		US_FL_GO_SLOW ),
+		US_FL_GO_SLOW | US_FL_MAX_SECTORS_64 ),
 
 /* Reported by Hanno Boeck <hanno@gmx.de>
  * Taken from the Lycoris Kernel */
@@ -1203,6 +1207,14 @@ UNUSUAL_DEV(  0x0ea0, 0x6828, 0x0110, 0x0110,
 		US_SC_DEVICE, US_PR_DEVICE, NULL,
 		US_FL_IGNORE_RESIDUE ),
 
+/* Reported by Benjamin Schiller <sbenni@gmx.de>
+ * It is also sold by Easylite as DJ 20 */
+UNUSUAL_DEV(  0x0ed1, 0x7636, 0x0103, 0x0103,
+		"Typhoon",
+		"My DJ 1820",
+		US_SC_DEVICE, US_PR_DEVICE, NULL,
+		US_FL_IGNORE_RESIDUE | US_FL_GO_SLOW | US_FL_MAX_SECTORS_64),
+
 /* Reported by Michael Stattmann <michael@stattmann.com> */
 UNUSUAL_DEV(  0x0fce, 0xd008, 0x0000, 0x0000,
 		"Sony Ericsson",

drivers/usb/storage/usb.h

@@ -176,8 +176,4 @@ extern void fill_inquiry_response(struct us_data *us,
 #define scsi_unlock(host)	spin_unlock_irq(host->host_lock)
 #define scsi_lock(host)		spin_lock_irq(host->host_lock)
 
-
-/* Vendor ID list for devices that require special handling */
-#define USB_VENDOR_ID_GENESYS		0x05e3	/* Genesys Logic */
-
 #endif

include/linux/usb_usual.h

@@ -43,6 +43,8 @@
 		/* Need delay after Command phase */		\
 	US_FLAG(NO_WP_DETECT,	0x00000200)			\
 		/* Don't check for write-protect */		\
+	US_FLAG(MAX_SECTORS_64,	0x00000400)			\
+		/* Sets max_sectors to 64    */
 
 #define US_FLAG(name, value)	US_FL_##name = value ,
 enum { US_DO_ALL_FLAGS };