Alexander Motin <mav_at_FreeBSD.org> wrote: > > The question still remains whether the previous implementation did return resid > >> 0 in some cases. In this case, I would need to implement both variants in the > > libscg adaption layer and I would need to know whether I am running on an old > > version or on a new version kernel. Do you know of a simple method to implement > > this distinction? > > Yes, some drivers were permanently reporting zero resid, while others > (mostly real SCSI) were reporting proper values. Now it is the same, > just more cases should work properly. > > Why do you want/need to distinguish them? You should already handle > non-zero resid properly. Zero resid may be wrong in some cases, but at > first I don't see fatal problem from it and at second I don't see what > can you do about it. > > If I am missing something - sorry, explain it to me please. Compare the number of sense bytes I like to request (18) with the number previous FreeBSD versions did actually request. It is obvious that in case there is a resid reported onm an old kernel, libscg (with your chanhge) would believe that probably less that the absolute minumum of sense data is available. Jörg -- EMail:joerg_at_schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin js_at_cs.tu-berlin.de (uni) joerg.schilling_at_fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/ URL: http://cdrecord.berlios.de/private/ ftp://ftp.berlios.de/pub/schilyReceived on Thu Nov 11 2010 - 09:33:07 UTC
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:40:09 UTC