Staging: hv: check return value of driver_for_each_device()

The return value of driver_for_each_device() is now checked.  A
non-zero value simply generates a warning message, but it's better
than not checking at all.
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Cc: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/hv/blkvsc_drv.c

@@ -218,8 +218,8 @@ void blkvsc_drv_exit(void)
 {
 	STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_blkvsc_drv.drv_obj;
 	struct driver_context *drv_ctx=&g_blkvsc_drv.drv_ctx;
-
 	struct device *current_dev=NULL;
+	int ret;
 
 	DPRINT_ENTER(BLKVSC_DRV);
 
@@ -228,7 +228,14 @@ void blkvsc_drv_exit(void)
 		current_dev = NULL;
 
 		/* Get the device */
-		driver_for_each_device(&drv_ctx->driver, NULL, (void*)&current_dev, blkvsc_drv_exit_cb);
+		ret = driver_for_each_device(&drv_ctx->driver, NULL,
+					     (void *) &current_dev,
+					     blkvsc_drv_exit_cb);
+
+		if (ret)
+			DPRINT_WARN(BLKVSC_DRV,
+				    "driver_for_each_device returned %d", ret);
+
 
 		if (current_dev == NULL)
 			break;

drivers/staging/hv/netvsc_drv.c

@@ -638,8 +638,8 @@ void netvsc_drv_exit(void)
 {
 	NETVSC_DRIVER_OBJECT *netvsc_drv_obj=&g_netvsc_drv.drv_obj;
 	struct driver_context *drv_ctx=&g_netvsc_drv.drv_ctx;
-
 	struct device *current_dev=NULL;
+	int ret;
 
 	DPRINT_ENTER(NETVSC_DRV);
 
@@ -648,7 +648,14 @@ void netvsc_drv_exit(void)
 		current_dev = NULL;
 
 		/* Get the device */
-		driver_for_each_device(&drv_ctx->driver, NULL, (void*)&current_dev, netvsc_drv_exit_cb);
+		ret = driver_for_each_device(&drv_ctx->driver, NULL,
+					     (void *) &current_dev,
+					     netvsc_drv_exit_cb);
+
+		if (ret)
+			DPRINT_WARN(NETVSC_DRV,
+				    "driver_for_each_device returned %d", ret);
+
 
 		if (current_dev == NULL)
 			break;

drivers/staging/hv/storvsc_drv.c

@@ -188,8 +188,8 @@ void storvsc_drv_exit(void)
 {
 	STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_storvsc_drv.drv_obj;
 	struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx;
-
 	struct device *current_dev=NULL;
+	int ret;
 
 	DPRINT_ENTER(STORVSC_DRV);
 
@@ -198,7 +198,13 @@ void storvsc_drv_exit(void)
 		current_dev = NULL;
 
 		/* Get the device */
-		driver_for_each_device(&drv_ctx->driver, NULL, (void*)&current_dev, storvsc_drv_exit_cb);
+		ret = driver_for_each_device(&drv_ctx->driver, NULL,
+					     (void *) &current_dev,
+					     storvsc_drv_exit_cb);
+
+		if (ret)
+			DPRINT_WARN(STORVSC_DRV,
+				    "driver_for_each_device returned %d", ret);
 
 		if (current_dev == NULL)
 			break;