Re: kern/42225: can't read data from SuperTop IDE Bridge (umass)

[christos%zoulas.com@localhost (Christos Zoulas)]

The following reply was made to PR kern/42225; it has been noted by GNATS.

From: christos%zoulas.com@localhost (Christos Zoulas)
To: gnats-bugs%NetBSD.org@localhost, kern-bug-people%netbsd.org@localhost, 
        gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/42225: can't read data from SuperTop IDE Bridge (umass)
Date: Sat, 24 Oct 2009 16:42:17 -0400

 On Oct 24,  8:40pm, kretschm%cs.uni-bonn.de@localhost 
(kretschm%cs.uni-bonn.de@localhost) wrote:
 -- Subject: kern/42225: can't read data from SuperTop IDE Bridge (umass)
 
 | The problem is, that the device has some quirk, such that the residue 
information is bad (always zero).
 | >How-To-Repeat:
 | Just attach the device and try to read/write data using dd.
 | >Fix:
 | The following patches for netbsd-5-0, netbsd-5 and HEAD branches correct the 
problem.
 | 
 | I introduced a new umass quirk UMASS_QUIRK_IGNORE_RESIDUE and added a 
corresponding entry to umass_quirks.c for the specific device.  I used the code 
on 5.0.0_PATCH and 5.0.1_PATCH systems for some months without any problems.  I 
created patches against the code of netbsd-5-0, netbsd-5 and HEAD branches of 
today.  They are given below.  I compiled kernels of all three branches and 
tried the device to check if it performs properly.
 | 
 | According to other operating systems' quirk lists there are many other 
umass-devices with this quirk.  Using this patch and adding a corresponding 
quirk entry in umass_quirk.c might solve the problem with those devices, too.  
I did not add further entries, because I only have this single device with the 
quirk and I'm unable to test the others.
 | 
 
 Can you please send the 'diff -u' output?
 
 
 Thanks,
 
 christos