Merge tag 'char-misc-3.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver fixes from Greg KH:
 "Here are two hyperv driver fixes, and one i8k driver fix for 3.16"

* tag 'char-misc-3.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  i8k: Fix non-SMP operation
  Drivers: hv: util: Fix a bug in the KVP code
  Drivers: hv: vmbus: Fix a bug in the channel callback dispatch code

4 files changed, 24 insertions, 7 deletions

diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index d915707d2ba1..93dcad0c1cbe 100644
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -138,7 +138,9 @@ static int i8k_smm(struct smm_regs *regs)
         if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
                 return -ENOMEM;
         cpumask_copy(old_mask, &current->cpus_allowed);
-        set_cpus_allowed_ptr(current, cpumask_of(0));
+        rc = set_cpus_allowed_ptr(current, cpumask_of(0));
+        if (rc)
+                goto out;
         if (smp_processor_id() != 0) {
                 rc = -EBUSY;
                 goto out;
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index e84f4526eb36..ae22e3c1fc4c 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -339,9 +339,13 @@ static void process_chn_event(u32 relid)
                  */
 
                 do {
-                        hv_begin_read(&channel->inbound);
+                        if (read_state)
+                                hv_begin_read(&channel->inbound);
                         channel->onchannel_callback(arg);
-                        bytes_to_read = hv_end_read(&channel->inbound);
+                        if (read_state)
+                                bytes_to_read = hv_end_read(&channel->inbound);
+                        else
+                                bytes_to_read = 0;
                 } while (read_state && (bytes_to_read != 0));
         } else {
                 pr_err("no channel callback for relid - %u\n", relid);
diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index ea852537307e..521c14625b3a 100644
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -127,6 +127,17 @@ kvp_work_func(struct work_struct *dummy)
         kvp_respond_to_host(NULL, HV_E_FAIL);
 }
 
+static void poll_channel(struct vmbus_channel *channel)
+{
+        if (channel->target_cpu != smp_processor_id())
+                smp_call_function_single(channel->target_cpu,
+                                         hv_kvp_onchannelcallback,
+                                         channel, true);
+        else
+                hv_kvp_onchannelcallback(channel);
+}
+
+
 static int kvp_handle_handshake(struct hv_kvp_msg *msg)
 {
         int ret = 1;
@@ -155,7 +166,7 @@ static int kvp_handle_handshake(struct hv_kvp_msg *msg)
                 kvp_register(dm_reg_value);
                 kvp_transaction.active = false;
                 if (kvp_transaction.kvp_context)
-                        hv_kvp_onchannelcallback(kvp_transaction.kvp_context);
+                        poll_channel(kvp_transaction.kvp_context);
         }
         return ret;
 }
@@ -568,7 +579,7 @@ response_done:
 
         vmbus_sendpacket(channel, recv_buffer, buf_len, req_id,
                                 VM_PKT_DATA_INBAND, 0);
-
+        poll_channel(channel);
 }
 
 /*
@@ -603,7 +614,7 @@ void hv_kvp_onchannelcallback(void *context)
                 return;
         }
 
-        vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 2, &recvlen,
+        vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen,
                          &requestid);
 
         if (recvlen > 0) {
diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
index dd761806f0e8..3b9c9ef0deb8 100644
--- a/drivers/hv/hv_util.c
+++ b/drivers/hv/hv_util.c
@@ -319,7 +319,7 @@ static int util_probe(struct hv_device *dev,
                 (struct hv_util_service *)dev_id->driver_data;
         int ret;
 
-        srv->recv_buffer = kmalloc(PAGE_SIZE * 2, GFP_KERNEL);
+        srv->recv_buffer = kmalloc(PAGE_SIZE * 4, GFP_KERNEL);
         if (!srv->recv_buffer)
                 return -ENOMEM;
         if (srv->util_init) {