From cf9648cb71d6f1a463553d2fcd4c8137587dc060 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Tue, 18 Jun 2019 09:37:42 +0800 Subject: scsi: vmw_pscsi: 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 Reviewed-by: Christoph Hellwig Reviewed-by: Bart Van Assche Signed-off-by: Ming Lei Signed-off-by: Martin K. Petersen --- drivers/scsi/vmw_pvscsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/scsi/vmw_pvscsi.c') diff --git a/drivers/scsi/vmw_pvscsi.c b/drivers/scsi/vmw_pvscsi.c index ecee4b3ff073..d71abd416eb4 100644 --- a/drivers/scsi/vmw_pvscsi.c +++ b/drivers/scsi/vmw_pvscsi.c @@ -335,7 +335,7 @@ static void pvscsi_create_sg(struct pvscsi_ctx *ctx, BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT); sge = &ctx->sgl->sge[0]; - for (i = 0; i < count; i++, sg++) { + for (i = 0; i < count; i++, sg = sg_next(sg)) { sge[i].addr = sg_dma_address(sg); sge[i].length = sg_dma_len(sg); sge[i].flags = 0; -- cgit v1.2.3