Staging: hv: Simplify root device management

As part of simplifying root device management,
get rid of the hv_driver object from
vmbus_driver_context.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Mike Sterling <mike.sterling@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>

1 files changed, 11 insertions, 30 deletions

diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c
index 159dfdaec0fc..884a4c65159d 100644
--- a/drivers/staging/hv/vmbus_drv.c
+++ b/drivers/staging/hv/vmbus_drv.c
@@ -42,7 +42,6 @@
 
 /* Main vmbus driver data structure */
 struct vmbus_driver_context {
-        struct hv_driver drv_obj;
 
         struct bus_type bus;
         struct tasklet_struct msg_dpc;
@@ -458,7 +457,6 @@ static ssize_t vmbus_show_device_attr(struct device *dev,
 static int vmbus_bus_init(void)
 {
         struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
-        struct hv_driver *driver = &vmbus_drv.drv_obj;
         struct hv_device *dev_ctx = &vmbus_drv.device_ctx;
         int ret;
         unsigned int vector;
@@ -474,13 +472,6 @@ static int vmbus_bus_init(void)
                         sizeof(struct vmbus_channel_packet_page_buffer),
                         sizeof(struct vmbus_channel_packet_multipage_buffer));
 
-        driver->name = driver_name;
-        memcpy(&driver->dev_type, &device_type, sizeof(struct hv_guid));
-
-        /* Setup dispatch table */
-        driver->dev_add = vmbus_dev_add;
-        driver->dev_rm  = vmbus_dev_rm;
-        driver->cleanup = vmbus_cleanup;
 
         /* Hypervisor initialization...setup hypercall page..etc */
         ret = hv_init();
@@ -490,22 +481,16 @@ static int vmbus_bus_init(void)
                 goto cleanup;
         }
 
-        /* Sanity checks */
-        if (!driver->dev_add) {
-                DPRINT_ERR(VMBUS_DRV, "OnDeviceAdd() routine not set");
-                ret = -1;
-                goto cleanup;
-        }
 
-        vmbus_drv_ctx->bus.name = driver->name;
+        vmbus_drv_ctx->bus.name = driver_name;
 
         /* Initialize the bus context */
         tasklet_init(&vmbus_drv_ctx->msg_dpc, vmbus_msg_dpc,
-                     (unsigned long)driver);
+                     (unsigned long)NULL);
         tasklet_init(&vmbus_drv_ctx->event_dpc, vmbus_event_dpc,
-                     (unsigned long)driver);
+                     (unsigned long)NULL);
 
-        /* Now, register the bus driver with LDM */
+        /* Now, register the bus  with LDM */
         ret = bus_register(&vmbus_drv_ctx->bus);
         if (ret) {
                 ret = -1;
@@ -514,7 +499,7 @@ static int vmbus_bus_init(void)
 
         /* Get the interrupt resource */
         ret = request_irq(vmbus_irq, vmbus_isr, IRQF_SAMPLE_RANDOM,
-                          driver->name, NULL);
+                          driver_name, NULL);
 
         if (ret != 0) {
                 DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to request IRQ %d",
@@ -529,10 +514,10 @@ static int vmbus_bus_init(void)
 
         DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
 
-        /* Call to bus driver to add the root device */
+        /* Add the root device */
         memset(dev_ctx, 0, sizeof(struct hv_device));
 
-        ret = driver->dev_add(dev_ctx, &vector);
+        ret = vmbus_dev_add(dev_ctx, &vector);
         if (ret != 0) {
                 DPRINT_ERR(VMBUS_DRV,
                            "ERROR - Unable to add vmbus root device");
@@ -555,7 +540,7 @@ static int vmbus_bus_init(void)
         /* Setup the device dispatch table */
         dev_ctx->device.release = vmbus_bus_release;
 
-        /* Setup the bus as root device */
+        /* register the  root device */
         ret = device_register(&dev_ctx->device);
         if (ret) {
                 DPRINT_ERR(VMBUS_DRV,
@@ -582,17 +567,14 @@ cleanup:
  */
 static void vmbus_bus_exit(void)
 {
-        struct hv_driver *driver = &vmbus_drv.drv_obj;
         struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
 
         struct hv_device *dev_ctx = &vmbus_drv.device_ctx;
 
         /* Remove the root device */
-        if (driver->dev_rm)
-                driver->dev_rm(dev_ctx);
+        vmbus_dev_rm(dev_ctx);
 
-        if (driver->cleanup)
-                driver->cleanup(driver);
+        vmbus_cleanup(NULL);
 
         /* Unregister the root bus device */
         device_unregister(&dev_ctx->device);
@@ -1026,11 +1008,10 @@ static void vmbus_event_dpc(unsigned long data)
 
 static irqreturn_t vmbus_isr(int irq, void *dev_id)
 {
-        struct hv_driver *driver = &vmbus_drv.drv_obj;
         int ret;
 
         /* Call to bus driver to handle interrupt */
-        ret = vmbus_on_isr(driver);
+        ret = vmbus_on_isr(NULL);
 
         /* Schedules a dpc if necessary */
         if (ret > 0) {