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authorMing Lei <ming.lei@redhat.com>2019-06-18 09:37:44 +0800
committerMartin K. Petersen <martin.petersen@oracle.com>2019-06-20 14:39:21 -0400
commit46e8e475a160be5e31e99171b7c0c8a21eb4d6ad (patch)
treed816e82bc261d63a2937d1200cb0bf368e3b8a7a /scripts/.gitignore
parentc0d0d81ad34a41e2aa562bc59f22bed3e9e98080 (diff)
scsi: lpfc: use sg helper to iterate over scatterlist
Unlike the legacy I/O path, scsi-mq preallocates a large array to hold the scatterlist for each request. This static allocation can consume substantial amounts of memory on modern controllers which support a large number of concurrently outstanding requests. To facilitate a switch to a smaller static allocation combined with a dynamic allocation for requests that need it, we need to make sure all SCSI drivers handle chained scatterlists correctly. Convert remaining drivers that directly dereference the scatterlist array to using the iterator functions. [mkp: clarified commit message] Reviewed by: Ewan D. Milne <emilne@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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