USB Mass Storage: limit "Rockchip ROCK MP3" device (071b:3203) max I/O to 64 sectors per command

The MP3/MP4/AVI player "Rockchip ROCK MP3" is seen as a USB disk, but fails
if more than 128 sectors (64kB) are sent or requested in a single read or write
command, and disconnects from the USB bus.

Typical kernel log showing the problem is:

usb 3-1: reset high speed USB device using ehci_hcd and address 6
usb 3-1: reset high speed USB device using ehci_hcd and address 6
sd 14:0:0:0: [sdb] Result: hostbyte=0x07 driverbyte=0x00
end_request: I/O error, dev sdb, sector 32
sd 14:0:0:0: [sdb] Result: hostbyte=0x07 driverbyte=0x00
end_request: I/O error, dev sdb, sector 32
usb 3-1: USB disconnect, address 6

This patch works around the device limitation by adding "Rockchip ROCK MP3"
to unusual USB devices list and limiting data transfers to 64 sectors (32kB)
per command.
Tested on 2.6.23-rc5 (amd64).
Signed-off-by: Massimiliano Ghilardi <massimiliano.ghilardi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/storage/unusual_devs.h

@@ -904,6 +904,22 @@ UNUSUAL_DEV(  0x069b, 0x3004, 0x0001, 0x0001,
 		US_SC_DEVICE, US_PR_DEVICE, NULL,
 		US_FL_FIX_CAPACITY ),
 
+/* Reported by Massimiliano Ghilardi <massimiliano.ghilardi@gmail.com>
+ * This USB MP3/AVI player device fails and disconnects if more than 128
+ * sectors (64kB) are read/written in a single command, and may be present
+ * at least in the following products:
+ *   "Magnex Digital Video Panel DVP 1800"
+ *   "MP4 AIGO 4GB SLOT SD"
+ *   "Teclast TL-C260 MP3"
+ *   "i.Meizu PMP MP3/MP4"
+ *   "Speed MV8 MP4 Audio Player"
+ */
+UNUSUAL_DEV(  0x071b, 0x3203, 0x0100, 0x0100,
+		"RockChip",
+		"ROCK MP3",
+		US_SC_DEVICE, US_PR_DEVICE, NULL,
+		US_FL_MAX_SECTORS_64),
+
 /* Reported by Olivier Blondeau <zeitoun@gmail.com> */
 UNUSUAL_DEV(  0x0727, 0x0306, 0x0100, 0x0100,
 		"ATMEL",