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authorVitaly Kuznetsov <vkuznets@redhat.com>2016-06-04 02:09:23 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-08-31 13:05:40 +0200
commit4d63763296ab7865a98bc29cc7d77145815ef89f (patch)
tree677d1fb88a994e9b29198f038f5735e13bc82249 /drivers/hv/channel.c
parentDrivers: hv: avoid vfree() on crash (diff)
downloadlinux-4d63763296ab7865a98bc29cc7d77145815ef89f.tar.xz
linux-4d63763296ab7865a98bc29cc7d77145815ef89f.zip
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>
Diffstat (limited to '')
-rw-r--r--drivers/hv/channel.c38
1 files changed, 16 insertions, 22 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 56dd261f7142..2b109e8a8c97 100644
--- 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);