hv: use dev_groups for device attributes

This patch is the first in a series that moves the hv bus code to use the
dev_groups field instead of dev_attrs, as dev_attrs is going away in future
kernel releases.

It moves the id sysfs file to the dev_groups structure, and creates the needed
show/store functions, instead of relying on one "universal" function for this.
By doing this, it removes the need for this to be in a temporary structure.

Tested-by: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 18 insertions, 6 deletions

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 6de6c98ce6eb..b58a1785d038 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -69,7 +69,6 @@ void vmbus_get_debug_info(struct vmbus_channel *channel,
         u8 monitor_group = (u8)channel->offermsg.monitorid / 32;
         u8 monitor_offset = (u8)channel->offermsg.monitorid % 32;
 
-        debuginfo->relid = channel->offermsg.child_relid;
         debuginfo->state = channel->state;
         memcpy(&debuginfo->interfacetype,
                &channel->offermsg.offer.if_type, sizeof(uuid_le));
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index f9fe46f52cfa..5c21b22860af 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -47,7 +47,6 @@ static struct completion probe_event;
 static int irq;
 
 struct hv_device_info {
-        u32 chn_id;
         u32 chn_state;
         uuid_le chn_type;
         uuid_le chn_instance;
@@ -83,7 +82,6 @@ static void get_channel_info(struct hv_device *device,
 
         vmbus_get_debug_info(device->channel, &debug_info);
 
-        info->chn_id = debug_info.relid;
         info->chn_state = debug_info.state;
         memcpy(&info->chn_type, &debug_info.interfacetype,
                sizeof(uuid_le));
@@ -156,8 +154,6 @@ static ssize_t vmbus_show_device_attr(struct device *dev,
                 ret = sprintf(buf, "vmbus:%s\n", alias_name);
         } else if (!strcmp(dev_attr->attr.name, "state")) {
                 ret = sprintf(buf, "%d\n", device_info->chn_state);
-        } else if (!strcmp(dev_attr->attr.name, "id")) {
-                ret = sprintf(buf, "%d\n", device_info->chn_id);
         } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
                 ret = sprintf(buf, "%d\n", device_info->outbound.int_mask);
         } else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
@@ -204,9 +200,25 @@ static ssize_t vmbus_show_device_attr(struct device *dev,
         return ret;
 }
 
+static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr,
+                       char *buf)
+{
+        struct hv_device *hv_dev = device_to_hv_device(dev);
+
+        if (!hv_dev->channel)
+                return -ENODEV;
+        return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid);
+}
+static DEVICE_ATTR_RO(id);
+
+static struct attribute *vmbus_attrs[] = {
+        &dev_attr_id.attr,
+        NULL,
+};
+ATTRIBUTE_GROUPS(vmbus);
+
 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
 static struct device_attribute vmbus_device_attrs[] = {
-        __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL),
         __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL),
         __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL),
         __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL),
@@ -384,6 +396,7 @@ static struct bus_type  hv_bus = {
         .probe =                vmbus_probe,
         .uevent =               vmbus_uevent,
         .dev_attrs =    vmbus_device_attrs,
+        .dev_groups =           vmbus_groups,
 };
 
 static const char *driver_name = "hyperv";