On Sun, Jul 01, 2007 at 11:00:43AM +0200, Oliver Neukum wrote: > My goals are: > > - guarantee the storage driver a fallback path without memory allocation
What about avoiding allocation of memory during a usb-storage transfer
completely?
Does anyone know if the SCSI core actually follows the sg_tablesize
parameter in the struct scsi_host_template ? Right now, it's set to
SG_ALL, which means "unlimited number of sg elements", but any other
non-zero value is supposed to be the maximum number of segments that the
SCSI core sends to usb-storage.
If it does, then we could advertise some maximum sg list size in that. We
could then use that same limit to pre-allocate all the URBs that
usb_sg_init would need.
Thus, we wouldn't need a fallback path without memory allocation.
Matt
--
Matthew Dharm Home: [EMAIL PROTECTED]
Maintainer, Linux USB Mass Storage Driver
God, root, what is difference?
-- Pitr
User Friendly, 11/11/1999
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