Merge airlied/drm-next into drm-misc-next

Backmerge the main pull request to sync up with all the newly landed
drivers. Otherwise we'll have chaos even before 4.12 started in
earnest.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

1 files changed, 22 insertions, 18 deletions

diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index 7e08a4d3d77d..64f0e8531af0 100644
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -929,23 +929,25 @@ static int kcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
                         goto out_error;
         }
 
-        /* New message, alloc head skb */
-        head = alloc_skb(0, sk->sk_allocation);
-        while (!head) {
-                kcm_push(kcm);
-                err = sk_stream_wait_memory(sk, &timeo);
-                if (err)
-                        goto out_error;
-
+        if (msg_data_left(msg)) {
+                /* New message, alloc head skb */
                 head = alloc_skb(0, sk->sk_allocation);
-        }
+                while (!head) {
+                        kcm_push(kcm);
+                        err = sk_stream_wait_memory(sk, &timeo);
+                        if (err)
+                                goto out_error;
 
-        skb = head;
+                        head = alloc_skb(0, sk->sk_allocation);
+                }
 
-        /* Set ip_summed to CHECKSUM_UNNECESSARY to avoid calling
-         * csum_and_copy_from_iter from skb_do_copy_data_nocache.
-         */
-        skb->ip_summed = CHECKSUM_UNNECESSARY;
+                skb = head;
+
+                /* Set ip_summed to CHECKSUM_UNNECESSARY to avoid calling
+                 * csum_and_copy_from_iter from skb_do_copy_data_nocache.
+                 */
+                skb->ip_summed = CHECKSUM_UNNECESSARY;
+        }
 
 start:
         while (msg_data_left(msg)) {
@@ -1018,10 +1020,12 @@ wait_for_memory:
         if (eor) {
                 bool not_busy = skb_queue_empty(&sk->sk_write_queue);
 
-                /* Message complete, queue it on send buffer */
-                __skb_queue_tail(&sk->sk_write_queue, head);
-                kcm->seq_skb = NULL;
-                KCM_STATS_INCR(kcm->stats.tx_msgs);
+                if (head) {
+                        /* Message complete, queue it on send buffer */
+                        __skb_queue_tail(&sk->sk_write_queue, head);
+                        kcm->seq_skb = NULL;
+                        KCM_STATS_INCR(kcm->stats.tx_msgs);
+                }
 
                 if (msg->msg_flags & MSG_BATCH) {
                         kcm->tx_wait_more = true;