From 3612ef99b05f107d5cd85f6bc45b94ed880d78f3 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Sat, 27 Aug 2011 11:31:20 -0700 Subject: [PATCH] Staging: hv: storvsc: Optimize bounce buffer handling for the "write" case Optimize bounce buffer handling for the "write" case. Signed-off-by: K. Y. Srinivasan Signed-off-by: Haiyang Zhang Signed-off-by: Greg Kroah-Hartman --- drivers/staging/hv/storvsc_drv.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c index 9464f99bf7a1..90b91ade825a 100644 --- a/drivers/staging/hv/storvsc_drv.c +++ b/drivers/staging/hv/storvsc_drv.c @@ -425,17 +425,17 @@ static void storvsc_commmand_completion(struct hv_storvsc_request *request) struct scsi_sense_hdr sense_hdr; struct vmscsi_request *vm_srb; + vm_srb = &request->vstor_packet.vm_srb; if (cmd_request->bounce_sgl_count) { - - /* FIXME: We can optimize on writes by just skipping this */ - copy_from_bounce_buffer(scsi_sglist(scmnd), + if (vm_srb->data_in == READ_TYPE) { + copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd)); - destroy_bounce_buffer(cmd_request->bounce_sgl, - cmd_request->bounce_sgl_count); + destroy_bounce_buffer(cmd_request->bounce_sgl, + cmd_request->bounce_sgl_count); + } } - vm_srb = &request->vstor_packet.vm_srb; scmnd->result = vm_srb->scsi_status; if (scmnd->result) { -- 2.20.1