Last time I looked at this, the answer was: because the scsi_error
code sleeps for seconds with the io_request_lock held, so that
no other code can do anything.
If this is still the case (I haven't checked the past month)
then I repeat my plea: remove the second, more severe, half
of scsi_error.c. It is really harmful, and can kill an otherwise
well-functioning system because of some triviality that is
wrong with some unimportant SCSI device.
["Cannot lock CDROM reader door" (when there is no door),
"Wrong block size on tape", etc. No matter how much the SCSI bus
is reset, these errors will not go away.]
Andries
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