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Message-Id: <1441636023-3704-4-git-send-email-olaf@aepfle.de>
Date: Mon, 7 Sep 2015 14:27:02 +0000
From: Olaf Hering <olaf@...fle.de>
To: kys@...rosoft.com, gregkh@...uxfoundation.org,
haiyangz@...rosoft.com
Cc: linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
Olaf Hering <olaf@...fle.de>
Subject: [PATCH 3/4] hv: kvp: use wrapper to propate state
The .state is used by several threads of execution.
Propagate the state to make changes visible. Also propagate context
change in kvp_on_msg.
Signed-off-by: Olaf Hering <olaf@...fle.de>
---
drivers/hv/hv_kvp.c | 38 +++++++++++++++++++++-----------------
1 file changed, 21 insertions(+), 17 deletions(-)
diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index 74c38a9..f421691 100644
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -61,7 +61,7 @@
*/
static struct {
- int state; /* hvutil_device_state */
+ enum hvutil_device_state state;
int recv_len; /* number of bytes received. */
struct hv_kvp_msg *kvp_msg; /* current message */
struct vmbus_channel *recv_channel; /* chn we got the request */
@@ -74,6 +74,9 @@ static struct {
*/
static int dm_reg_value;
+#define kvp_get_state() hvutil_device_get_state(&kvp_transaction.state)
+#define kvp_set_state(s) hvutil_device_set_state(&kvp_transaction.state, s)
+
static void kvp_send_key(struct work_struct *dummy);
@@ -122,8 +125,8 @@ static void kvp_timeout_func(struct work_struct *dummy)
kvp_respond_to_host(NULL, HV_E_FAIL);
/* Transaction is finished, reset the state. */
- if (kvp_transaction.state > HVUTIL_READY)
- kvp_transaction.state = HVUTIL_READY;
+ if (kvp_get_state() > HVUTIL_READY)
+ kvp_set_state(HVUTIL_READY);
hv_poll_channel(kvp_transaction.kvp_context,
hv_kvp_onchannelcallback);
@@ -153,7 +156,7 @@ static int kvp_handle_handshake(struct hv_kvp_msg *msg)
pr_debug("KVP: userspace daemon ver. %d registered\n",
KVP_OP_REGISTER);
kvp_register(dm_reg_value);
- kvp_transaction.state = HVUTIL_READY;
+ kvp_set_state(HVUTIL_READY);
return 0;
}
@@ -177,15 +180,15 @@ static int kvp_on_msg(void *msg, int len)
* with the daemon; handle that first.
*/
- if (kvp_transaction.state < HVUTIL_READY) {
+ if (kvp_get_state() < HVUTIL_READY) {
return kvp_handle_handshake(message);
}
/* We didn't send anything to userspace so the reply is spurious */
- if (kvp_transaction.state < HVUTIL_USERSPACE_REQ)
+ if (kvp_get_state() < HVUTIL_USERSPACE_REQ)
return -EINVAL;
- kvp_transaction.state = HVUTIL_USERSPACE_RECV;
+ kvp_set_state(HVUTIL_USERSPACE_RECV);
/*
* Based on the version of the daemon, we propagate errors from the
@@ -218,7 +221,7 @@ static int kvp_on_msg(void *msg, int len)
*/
if (cancel_delayed_work_sync(&kvp_timeout_work)) {
kvp_respond_to_host(message, error);
- kvp_transaction.state = HVUTIL_READY;
+ kvp_set_state(HVUTIL_READY);
hv_poll_channel(kvp_transaction.kvp_context,
hv_kvp_onchannelcallback);
}
@@ -349,7 +352,7 @@ kvp_send_key(struct work_struct *dummy)
int rc;
/* The transaction state is wrong. */
- if (kvp_transaction.state != HVUTIL_HOSTMSG_RECEIVED)
+ if (kvp_get_state() != HVUTIL_HOSTMSG_RECEIVED)
return;
message = kzalloc(sizeof(*message), GFP_KERNEL);
@@ -442,13 +445,13 @@ kvp_send_key(struct work_struct *dummy)
break;
}
- kvp_transaction.state = HVUTIL_USERSPACE_REQ;
+ kvp_set_state(HVUTIL_USERSPACE_REQ);
rc = hvutil_transport_send(hvt, message, sizeof(*message));
if (rc) {
pr_debug("KVP: failed to communicate to the daemon: %d\n", rc);
if (cancel_delayed_work_sync(&kvp_timeout_work)) {
kvp_respond_to_host(message, HV_E_FAIL);
- kvp_transaction.state = HVUTIL_READY;
+ kvp_set_state(HVUTIL_READY);
}
}
@@ -596,12 +599,13 @@ void hv_kvp_onchannelcallback(void *context)
int util_fw_version;
int kvp_srv_version;
- if (kvp_transaction.state > HVUTIL_READY) {
+ if (kvp_get_state() > HVUTIL_READY) {
/*
* We will defer processing this callback once
* the current transaction is complete.
*/
kvp_transaction.kvp_context = context;
+ wmb();
return;
}
kvp_transaction.kvp_context = NULL;
@@ -651,12 +655,12 @@ void hv_kvp_onchannelcallback(void *context)
kvp_transaction.recv_req_id = requestid;
kvp_transaction.kvp_msg = kvp_msg;
- if (kvp_transaction.state < HVUTIL_READY) {
+ if (kvp_get_state() < HVUTIL_READY) {
/* Userspace is not registered yet */
kvp_respond_to_host(NULL, HV_E_FAIL);
return;
}
- kvp_transaction.state = HVUTIL_HOSTMSG_RECEIVED;
+ kvp_set_state(HVUTIL_HOSTMSG_RECEIVED);
/*
* Get the information from the
@@ -688,7 +692,7 @@ static void kvp_on_reset(void)
{
if (cancel_delayed_work_sync(&kvp_timeout_work))
kvp_respond_to_host(NULL, HV_E_FAIL);
- kvp_transaction.state = HVUTIL_DEVICE_INIT;
+ kvp_set_state(HVUTIL_DEVICE_INIT);
}
int
@@ -702,7 +706,7 @@ hv_kvp_init(struct hv_util_service *srv)
* Defer processing channel callbacks until the daemon
* has registered.
*/
- kvp_transaction.state = HVUTIL_DEVICE_INIT;
+ kvp_set_state(HVUTIL_DEVICE_INIT);
hvt = hvutil_transport_init(kvp_devname, CN_KVP_IDX, CN_KVP_VAL,
kvp_on_msg, kvp_on_reset);
@@ -714,7 +718,7 @@ hv_kvp_init(struct hv_util_service *srv)
void hv_kvp_deinit(void)
{
- kvp_transaction.state = HVUTIL_DEVICE_DYING;
+ kvp_set_state(HVUTIL_DEVICE_DYING);
cancel_delayed_work_sync(&kvp_timeout_work);
cancel_work_sync(&kvp_sendkey_work);
hvutil_transport_destroy(hvt);
--
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