From: K. Y. Srinivasan <kys@microsoft.com>
Date: Mon, 28 Mar 2011 16:33:27 +0000 (-0700)
Subject: Staging: hv: Embed struct storvsc_request_extension into hv_storvsc_request
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=2fd0df276e4ebb411dd0f87a2c9381b466f81ed4;p=deliverable%2Flinux.git

Staging: hv: Embed struct storvsc_request_extension into hv_storvsc_request

Embed struct storvsc_request_extension into hv_storvsc_request.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index a5c0ac4bc894..0a3eb5c00a92 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -84,12 +84,6 @@ struct blkvsc_request {
 	unsigned char cmnd[MAX_COMMAND_SIZE];
 
 	struct hv_storvsc_request request;
-	/*
-	 * !!!DO NOT ADD ANYTHING BELOW HERE!!! Otherwise, memory can overlap,
-	 * because - The extension buffer falls right here and is pointed to by
-	 * request.Extension;
-	 * Which sounds like a horrible idea, who designed this?
-	 */
 };
 
 /* Per device structure */
@@ -944,8 +938,6 @@ static int blkvsc_submit_request(struct blkvsc_request *blkvsc_req,
 #endif
 
 	storvsc_req = &blkvsc_req->request;
-	storvsc_req->extension = (void *)((unsigned long)blkvsc_req +
-					  sizeof(struct blkvsc_request));
 
 	storvsc_req->type = blkvsc_req->write ? WRITE_TYPE : READ_TYPE;
 
diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index 6801e3738766..5cea33128eda 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -533,8 +533,7 @@ int stor_vsc_on_io_request(struct hv_device *device,
 	struct vstor_packet *vstor_packet;
 	int ret = 0;
 
-	request_extension =
-		(struct storvsc_request_extension *)request->extension;
+	request_extension = &request->extension;
 	vstor_packet = &request_extension->vstor_packet;
 	stor_device = get_stor_device(device);
 
diff --git a/drivers/staging/hv/storvsc_api.h b/drivers/staging/hv/storvsc_api.h
index 800ebbfeb47d..e41b68b13110 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -83,8 +83,7 @@ struct hv_storvsc_request {
 
 	void (*on_io_completion)(struct hv_storvsc_request *request);
 
-	/* This points to the memory after DataBuffer */
-	void *extension;
+	struct storvsc_request_extension extension;
 
 	struct hv_multipage_buffer data_buffer;
 };
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 127d12250dd5..58d12e0a88c9 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -69,10 +69,6 @@ struct storvsc_cmd_request {
 	struct scatterlist *bounce_sgl;
 
 	struct hv_storvsc_request request;
-	/* !!!DO NOT ADD ANYTHING BELOW HERE!!! */
-	/* The extension buffer falls right here and is pointed to by
-	 * request.Extension;
-	 * Which sounds like a very bad design... */
 };
 
 
@@ -763,8 +759,6 @@ static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd,
 
 	request = &cmd_request->request;
 
-	request->extension =
-		(void *)((unsigned long)cmd_request + request_size);
 	DPRINT_DBG(STORVSC_DRV, "req %p size %d ext %d", request, request_size,
 		   storvsc_drv_obj->request_ext_size);