[SCSI] qla2xxx: Cache swl during fabric discovery.
Rather than continuously allocating and freeing swl within the discovery process, simply pre-allocate it the first time that it's needed, cache it through the rest of the lifecycle of the driver and free it at module unload. Signed-off-by: NAndrew Vasquez <andrew.vasquez@qlogic.com> Signed-off-by: NChad Dupuis <chad.dupuis@qlogic.com> Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>
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