Drivers: hv: get rid of redundant messagecount in create_gpadl_header()

We use messagecount only once in vmbus_establish_gpadl() to check if
it is safe to iterate through the submsglist. We can just initialize
the list header in all cases in create_gpadl_header() instead.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 56dd261..2b109e8 100644 (file)
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -238,8 +238,7 @@ EXPORT_SYMBOL_GPL(vmbus_send_tl_connect_request);
  * create_gpadl_header - Creates a gpadl for the specified buffer
  */
 static int create_gpadl_header(void *kbuffer, u32 size,
-                                        struct vmbus_channel_msginfo **msginfo,
-                                        u32 *messagecount)
+                              struct vmbus_channel_msginfo **msginfo)
 {
        int i;
        int pagecount;
@@ -283,7 +282,6 @@ static int create_gpadl_header(void *kbuffer, u32 size,
                        gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys(
                                kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT;
                *msginfo = msgheader;
-               *messagecount = 1;
 
                pfnsum = pfncount;
                pfnleft = pagecount - pfncount;
@@ -323,7 +321,6 @@ static int create_gpadl_header(void *kbuffer, u32 size,
                        }
 
                        msgbody->msgsize = msgsize;
-                       (*messagecount)++;
                        gpadl_body =
                                (struct vmbus_channel_gpadl_body *)msgbody->msg;
 
@@ -352,6 +349,8 @@ static int create_gpadl_header(void *kbuffer, u32 size,
                msgheader = kzalloc(msgsize, GFP_KERNEL);
                if (msgheader == NULL)
                        goto nomem;
+
+               INIT_LIST_HEAD(&msgheader->submsglist);
                msgheader->msgsize = msgsize;
 
                gpadl_header = (struct vmbus_channel_gpadl_header *)
@@ -366,7 +365,6 @@ static int create_gpadl_header(void *kbuffer, u32 size,
                                kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT;
 
                *msginfo = msgheader;
-               *messagecount = 1;
        }
 
        return 0;
@@ -391,7 +389,6 @@ int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
        struct vmbus_channel_gpadl_body *gpadl_body;
        struct vmbus_channel_msginfo *msginfo = NULL;
        struct vmbus_channel_msginfo *submsginfo;
-       u32 msgcount;
        struct list_head *curr;
        u32 next_gpadl_handle;
        unsigned long flags;
@@ -400,7 +397,7 @@ int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
        next_gpadl_handle =
                (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1);
 
-       ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount);
+       ret = create_gpadl_header(kbuffer, size, &msginfo);
        if (ret)
                return ret;
 
@@ -423,24 +420,21 @@ int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
        if (ret != 0)
                goto cleanup;
 
-       if (msgcount > 1) {
-               list_for_each(curr, &msginfo->submsglist) {
+       list_for_each(curr, &msginfo->submsglist) {
+               submsginfo = (struct vmbus_channel_msginfo *)curr;
+               gpadl_body =
+                       (struct vmbus_channel_gpadl_body *)submsginfo->msg;
 
-                       submsginfo = (struct vmbus_channel_msginfo *)curr;
-                       gpadl_body =
-                            (struct vmbus_channel_gpadl_body *)submsginfo->msg;
+               gpadl_body->header.msgtype =
+                       CHANNELMSG_GPADL_BODY;
+               gpadl_body->gpadl = next_gpadl_handle;
 
-                       gpadl_body->header.msgtype =
-                               CHANNELMSG_GPADL_BODY;
-                       gpadl_body->gpadl = next_gpadl_handle;
+               ret = vmbus_post_msg(gpadl_body,
+                                    submsginfo->msgsize -
+                                    sizeof(*submsginfo));
+               if (ret != 0)
+                       goto cleanup;
 
-                       ret = vmbus_post_msg(gpadl_body,
-                                              submsginfo->msgsize -
-                                              sizeof(*submsginfo));
-                       if (ret != 0)
-                               goto cleanup;
-
-               }
        }
        wait_for_completion(&msginfo->waitevent);