Merge tag 'char-misc-3.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver updates from Greg KH:
 "Here's the big set of driver patches for char/misc drivers.  Nothing
  major in here, the shortlog goes into the details.  All have been in
  the linux-next tree for a while with no issues"

* tag 'char-misc-3.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (80 commits)
  mei: mei_txe_fw_sts can be static
  mei: fix kernel-doc warnings
  mei: fix KDoc documentation formatting
  mei: drop me_client_presentation_num
  mei: trivial: fix errors in prints in comments
  mei: remove include to pci header from mei module files
  mei: push pci cfg structure me hw
  mei: remove the reference to pdev from mei_device
  mei: move fw_status back to hw ops handlers
  mei: get rid of most of the pci dependencies in mei
  mei: push all standard settings into mei_device_init
  mei: move mei_hbm_hdr function from hbm.h the hbm.c
  mei: kill error message for allocation failure
  mei: nfc: fix style warning
  mei: fix style warning: Missing a blank line after declarations
  mei: pg: fix cat and paste error in comments
  mei: debugfs: add single buffer indicator
  mei: debugfs: adjust print buffer
  mei: add hbm and pg state in devstate debugfs print
  Drivers: hv: vmbus: Enable interrupt driven flow control
  ...

1 files changed, 15 insertions, 12 deletions

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index edfc8488cb03..3e4235c7a47f 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -138,6 +138,8 @@ int hv_init(void)
 	memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);
 	memset(hv_context.synic_message_page, 0,
 	       sizeof(void *) * NR_CPUS);
+	memset(hv_context.post_msg_page, 0,
+	       sizeof(void *) * NR_CPUS);
 	memset(hv_context.vp_index, 0,
 	       sizeof(int) * NR_CPUS);
 	memset(hv_context.event_dpc, 0,
@@ -217,26 +219,18 @@ int hv_post_message(union hv_connection_id connection_id,
 		  enum hv_message_type message_type,
 		  void *payload, size_t payload_size)
 {
-	struct aligned_input {
-		u64 alignment8;
-		struct hv_input_post_message msg;
-	};
 
 	struct hv_input_post_message *aligned_msg;
 	u16 status;
-	unsigned long addr;
 
 	if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
 		return -EMSGSIZE;
 
-	addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
-	if (!addr)
-		return -ENOMEM;
-
 	aligned_msg = (struct hv_input_post_message *)
-			(ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));
+			hv_context.post_msg_page[get_cpu()];
 
 	aligned_msg->connectionid = connection_id;
+	aligned_msg->reserved = 0;
 	aligned_msg->message_type = message_type;
 	aligned_msg->payload_size = payload_size;
 	memcpy((void *)aligned_msg->payload, payload, payload_size);
@@ -244,8 +238,7 @@ int hv_post_message(union hv_connection_id connection_id,
 	status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
 		& 0xFFFF;
 
-	kfree((void *)addr);
-
+	put_cpu();
 	return status;
 }
 
@@ -294,6 +287,14 @@ int hv_synic_alloc(void)
 			pr_err("Unable to allocate SYNIC event page\n");
 			goto err;
 		}
+
+		hv_context.post_msg_page[cpu] =
+			(void *)get_zeroed_page(GFP_ATOMIC);
+
+		if (hv_context.post_msg_page[cpu] == NULL) {
+			pr_err("Unable to allocate post msg page\n");
+			goto err;
+		}
 	}
 
 	return 0;
@@ -308,6 +309,8 @@ static void hv_synic_free_cpu(int cpu)
 		free_page((unsigned long)hv_context.synic_event_page[cpu]);
 	if (hv_context.synic_message_page[cpu])
 		free_page((unsigned long)hv_context.synic_message_page[cpu]);
+	if (hv_context.post_msg_page[cpu])
+		free_page((unsigned long)hv_context.post_msg_page[cpu]);
 }
 
 void hv_synic_free(void)