[SCSI] libiscsi: change login data buffer allocation
This modifies the login buffer allocation to use __get_free_pages. It will allow drivers that want to send this data with zero copy operations to easily line things up on page boundaries. Signed-off-by: NMike Christie <michaelc@cs.wisc.edu> Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>
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