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| author |   Vitaly Kuznetsov <vkuznets@redhat.com> | 2016-06-03 17:09:23 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-31 13:05:40 +0200 |
| commit | 4d63763296ab7865a98bc29cc7d77145815ef89f (patch) | |
| tree | 677d1fb88a994e9b29198f038f5735e13bc82249 /drivers/hv/channel.c | |
| parent | Drivers: hv: avoid vfree() on crash (diff) | |
| download | linux-dev-4d63763296ab7865a98bc29cc7d77145815ef89f.tar.xz linux-dev-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 'drivers/hv/channel.c')
| -rw-r--r-- | drivers/hv/channel.c | 38 |
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); |