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

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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>
This commit is contained in:
Vitaly Kuznetsov 2016-06-03 17:09:23 -07:00 committed by Greg Kroah-Hartman
parent a9f61ca793
commit 4d63763296
1 changed files with 16 additions and 22 deletions
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38
drivers/hv/channel.c
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@ -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);