On Thu, 30 Mar 2017, Oliver Neukum wrote: > Am Donnerstag, den 30.03.2017, 11:55 -0400 schrieb Alan Stern: > > > > I'm pretty sure that usb-storage does not do this, at least, not when > > operating in its normal Bulk-Only-Transport mode. It never tries to > > read the results of an earlier transfer after carrying out a later > > transfer to any part of the same buffer. > > The storage driver takes buffers as the block layer (or sg) provide > them, does it not?
Yes. But it does not read the data from an earlier transfer after carrying out a later transfer on the same buffer. The only possible example would be if the sense buffer for a command occupied part of the same block as the data buffer. But this can't happen, because the sense buffer is allocated separately by its own kzalloc_node() call in scsi_init_request(). Alan Stern
