Messages in this thread | | | From | Mike Lampard <> | Subject | long-term regression with some usb mass storage devices | Date | Fri, 20 Feb 2009 17:17:42 +1030 |
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Hi All,
I recently plonked a dvd into my usb-attached Pioneer DVR-107d only to find that the current kernels no longer saw the drive as DVD capable. In fact, the kernel no longer saw _any_ features of the drive: sr0: scsi3-mmc drive: 0x/0x caddy. After much bisecting and even more blind luck I narrowed the problem down to this commit:
commit bdb2b8cab4392ce41ddfbd6773a3da3334daf836 Author: Alan Stern <stern@rowland.harvard.edu> Date: Tue Jun 24 14:03:14 2008 -0400
[SCSI] erase invalid data returned by device
This patch (as1108) fixes a problem that can occur with certain USB mass-storage devices: They return invalid data together with a residue indicating that the data should be ignored. Rather than leave the invalid data in a transfer buffer, where it can get misinterpreted, the patch clears the invalid portion of the buffer.
This solves a problem (wrong write-protect setting detected) reported by Maciej Rutecki and Peter Teoh.
Regards Mike
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