From fa23b8c78fefae4e8033a28e685673c35ff10789 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Sat, 27 Aug 2011 11:31:21 -0700 Subject: [PATCH] Staging: hv: storvsc: Optimize the bounce buffer handling in the "read" case Optimize the bounce buffer handling in the "read" case. Signed-off-by: K. Y. Srinivasan Signed-off-by: Haiyang Zhang Signed-off-by: Greg Kroah-Hartman --- drivers/staging/hv/storvsc_drv.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c index 90b91ade825a..3e00e70c945d 100644 --- a/drivers/staging/hv/storvsc_drv.c +++ b/drivers/staging/hv/storvsc_drv.c @@ -560,12 +560,10 @@ static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd, ALIGN(scsi_bufflen(scmnd), PAGE_SIZE) >> PAGE_SHIFT; - /* - * FIXME: We can optimize on reads by just skipping - * this - */ - copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, - scsi_sg_count(scmnd)); + if (vm_srb->data_in == WRITE_TYPE) + copy_to_bounce_buffer(sgl, + cmd_request->bounce_sgl, + scsi_sg_count(scmnd)); sgl = cmd_request->bounce_sgl; sg_count = cmd_request->bounce_sgl_count;