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Message-Id: <1310752065-27895-99-git-send-email-kys@microsoft.com>
Date: Fri, 15 Jul 2011 10:47:27 -0700
From: "K. Y. Srinivasan" <kys@...rosoft.com>
To: gregkh@...e.de, linux-kernel@...r.kernel.org,
devel@...uxdriverproject.org, virtualization@...ts.osdl.org
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>
Subject: [PATCH 099/117] 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 <kys@...rosoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
drivers/staging/hv/storvsc_drv.c | 12 ++++++------
1 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 5777482..e2294d5 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -428,17 +428,17 @@ 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) {
--
1.7.4.1
--
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