Douglas Gilbert wrote:
> It has been reported that the change to sg.c in lk 2.6.9-rc1-bk5
> to use library jiffy functions breaks sg (albeit under vmware).
> Evidentally sg devices are no longer recognised after that change.
> 
> Reverting that changeset removes the problem. Strange, it is not
> obvious why.
> 
> At some stage I must have detected negative time spans (yeh yeh it
> never happens) and my versions returned 0 in this case; otherwise
> the implementations look very similar.

The following patch fixes the problem. It is
against lk 2.6.9-rc1-bk7 (i.e. after "standard"
jiffy_to_millisecs macros replaced sg versions).

Change:
    - make sure a (large) user supplied timeout value does
      not result in a negative timeout passed to the midlevel
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>