Re: [usb-storage] Re: usb disk recognized but fails

[Matthieu CASTET <castet.matthieu@free.fr>]

Hi,

Le Fri, 24 Jan 2014 11:07:01 -0500,
Alan Stern <stern@rowland.harvard.edu> a écrit :

> Matthieu:
> 
> Can you help with this problem?
> 
> 
> You were right; that driver caused the problem.
> 
> Matthieu Castet wrote the Cypress-ATACB driver, so maybe he can help.
> 
> As shown above, this device matches the last entry in the
> unusual_cypress.h file (the one named "Super Top").  Not shown here is

The "Super Top" id were added later. When I did the driver I only
check the datasheet of the fisrt two entry.

Looking at the git log, we can see there already was corruption
detected by this entry [1].


Without knowing what chip is in the "super top" bridge, I propose to
remove the entry : it seems to cause too much trouble.

An alternative could be to enable it only for bcdDevice 
1.60.

Matthieu

[1]
    USB: usb-storage: unusual_devs update for Super TOP SATA bridge
    
    The current entry in unusual_cypress.h for the Super TOP SATA bridge devices
    seems to be causing corruption on newer revisions of this device.  This has
    been reported in Arch Linux and Fedora.  The original patch was tested on
    devices with bcdDevice of 1.60, whereas the newer devices report bcdDevice
    as 2.20.  Limit the UNUSUAL_DEV entry to devices less than 2.20.
    
    This fixes https://bugzilla.redhat.com/show_bug.cgi?id=909591
    
    The Arch Forum post on this is here:
        https://bbs.archlinux.org/viewtopic.php?id=152011
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