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authorMing Lei2019-06-18 03:37:49 +0200
committerMartin K. Petersen2019-06-20 21:21:32 +0200
commitda5567369fb686eb050da15364f11ef561f9a03e (patch)
tree5597db2871ca617db9f5aeee2bb502ff4210aeee /drivers/s390
parentscsi: usb: image: microtek: use sg helper to iterate over scatterlist (diff)
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scsi: staging: unisys: visorhba: 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] Cc: devel@driverdev.osuosl.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 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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