From: Massimiliano Ghilardi <massimiliano.ghilardi@gmail.com>
To: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Cc: linux-usb-users@lists.sourceforge.net,
usb-storage@lists.one-eyed-alien.net,
linux-kernel@vger.kernel.org
Subject: [PATCH 2.6.23-rc5] USB Mass Storage: limit "Rockchip ROCK MP3" device (071b:3203) max I/O to 64 sectors per command
Date: Tue, 4 Sep 2007 22:53:43 +0200 [thread overview]
Message-ID: <200709042253.43367.massimiliano.ghilardi@gmail.com> (raw)
From: Massimiliano Ghilardi <massimiliano.ghilardi@gmail.com>
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>
---
drivers/usb/storage/unusual_devs.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
--- a/drivers/usb/storage/unusual_devs.h 2007-09-01 17:08:55.000000000 +0200
+++ b/drivers/usb/storage/unusual_devs.h 2007-09-04 22:40:28.000000000 +0200
@@ -897,6 +897,22 @@
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",
reply other threads:[~2007-09-04 20:53 UTC|newest]
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