linux-kernel - [PATCH 4/4] staging: hv: Fix the code depending on struct storvsc_driver

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Message-Id: <1298492398-16522-4-git-send-email-haiyangz@microsoft.com>
Date:	Wed, 23 Feb 2011 12:19:58 -0800
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	haiyangz@...rosoft.com, hjanssen@...rosoft.com, kys@...rosoft.com,
	v-abkane@...rosoft.com, gregkh@...e.de,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	virtualization@...ts.osdl.org
Subject: [PATCH 4/4] staging: hv: Fix the code depending on struct storvsc_driver_context data order

The patch fixed the code depending on the exact order of fields in the
struct storvsc_driver_context. Now, we use container_of() instead of type
casting from the first field to the container struct.

Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Hank Janssen <hjanssen@...rosoft.com>

---
 drivers/staging/hv/storvsc_drv.c |   14 ++++++--------
 1 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 33acee5..a364627 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -64,8 +64,6 @@ struct storvsc_cmd_request {
 };
 
 struct storvsc_driver_context {
-	/* !! These must be the first 2 fields !! */
-	/* FIXME this is a bug... */
 	struct driver_context drv_ctx;
 	struct storvsc_driver_object drv_obj;
 };
@@ -223,8 +221,8 @@ static int storvsc_probe(struct device *device)
 	int ret;
 	struct driver_context *driver_ctx =
 				driver_to_driver_context(device->driver);
-	struct storvsc_driver_context *storvsc_drv_ctx =
-				(struct storvsc_driver_context *)driver_ctx;
+	struct storvsc_driver_context *storvsc_drv_ctx = container_of(
+		driver_ctx, struct storvsc_driver_context, drv_ctx);
 	struct storvsc_driver_object *storvsc_drv_obj =
 				&storvsc_drv_ctx->drv_obj;
 	struct vm_device *device_ctx = device_to_vm_device(device);
@@ -308,8 +306,8 @@ static int storvsc_remove(struct device *device)
 	int ret;
 	struct driver_context *driver_ctx =
 			driver_to_driver_context(device->driver);
-	struct storvsc_driver_context *storvsc_drv_ctx =
-			(struct storvsc_driver_context *)driver_ctx;
+	struct storvsc_driver_context *storvsc_drv_ctx = container_of(
+		driver_ctx, struct storvsc_driver_context, drv_ctx);
 	struct storvsc_driver_object *storvsc_drv_obj =
 			&storvsc_drv_ctx->drv_obj;
 	struct vm_device *device_ctx = device_to_vm_device(device);
@@ -606,8 +604,8 @@ static int storvsc_queuecommand_lck(struct scsi_cmnd *scmnd,
 	struct vm_device *device_ctx = host_device_ctx->device_ctx;
 	struct driver_context *driver_ctx =
 		driver_to_driver_context(device_ctx->device.driver);
-	struct storvsc_driver_context *storvsc_drv_ctx =
-		(struct storvsc_driver_context *)driver_ctx;
+	struct storvsc_driver_context *storvsc_drv_ctx = container_of(
+		driver_ctx, struct storvsc_driver_context, drv_ctx);
 	struct storvsc_driver_object *storvsc_drv_obj =
 		&storvsc_drv_ctx->drv_obj;
 	struct hv_storvsc_request *request;
-- 
1.6.3.2

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