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Message-Id: <1441636023-3704-5-git-send-email-olaf@aepfle.de>
Date: Mon, 7 Sep 2015 14:27:03 +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 4/4] hv: vss: 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 vss_on_msg.
Signed-off-by: Olaf Hering <olaf@...fle.de>
---
drivers/hv/hv_snapshot.c | 37 ++++++++++++++++++++-----------------
1 file changed, 20 insertions(+), 17 deletions(-)
diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c
index 815405f..f3cb822 100644
--- a/drivers/hv/hv_snapshot.c
+++ b/drivers/hv/hv_snapshot.c
@@ -48,7 +48,7 @@
*/
static struct {
- int state; /* hvutil_device_state */
+ enum hvutil_device_state state;
int recv_len; /* number of bytes received. */
struct vmbus_channel *recv_channel; /* chn we got the request */
u64 recv_req_id; /* request ID. */
@@ -64,6 +64,9 @@ static void vss_respond_to_host(int error);
*/
static int dm_reg_value;
+#define vss_get_state() hvutil_device_get_state(&vss_transaction.state)
+#define vss_set_state(s) hvutil_device_set_state(&vss_transaction.state, s)
+
static const char vss_devname[] = "vmbus/hv_vss";
static __u8 *recv_buffer;
static struct hvutil_transport *hvt;
@@ -87,8 +90,8 @@ static void vss_timeout_func(struct work_struct *dummy)
vss_respond_to_host(HV_E_FAIL);
/* Transaction is finished, reset the state. */
- if (vss_transaction.state > HVUTIL_READY)
- vss_transaction.state = HVUTIL_READY;
+ if (vss_get_state() > HVUTIL_READY)
+ vss_set_state(HVUTIL_READY);
hv_poll_channel(vss_transaction.vss_context,
hv_vss_onchannelcallback);
@@ -112,7 +115,7 @@ static int vss_handle_handshake(struct hv_vss_msg *vss_msg)
default:
return -EINVAL;
}
- vss_transaction.state = HVUTIL_READY;
+ vss_set_state(HVUTIL_READY);
pr_debug("VSS: userspace daemon ver. %d registered\n", dm_reg_value);
return 0;
}
@@ -130,15 +133,15 @@ static int vss_on_msg(void *msg, int len)
* Don't process registration messages if we're in the middle
* of a transaction processing.
*/
- if (vss_transaction.state > HVUTIL_READY)
+ if (vss_get_state() > HVUTIL_READY)
return -EINVAL;
return vss_handle_handshake(vss_msg);
- } else if (vss_transaction.state == HVUTIL_USERSPACE_REQ) {
- vss_transaction.state = HVUTIL_USERSPACE_RECV;
+ } else if (vss_get_state() == HVUTIL_USERSPACE_REQ) {
+ vss_set_state(HVUTIL_USERSPACE_RECV);
if (cancel_delayed_work_sync(&vss_timeout_work)) {
vss_respond_to_host(vss_msg->error);
/* Transaction is finished, reset the state. */
- vss_transaction.state = HVUTIL_READY;
+ vss_set_state(HVUTIL_READY);
hv_poll_channel(vss_transaction.vss_context,
hv_vss_onchannelcallback);
}
@@ -158,7 +161,7 @@ static void vss_send_op(struct work_struct *dummy)
struct hv_vss_msg *vss_msg;
/* The transaction state is wrong. */
- if (vss_transaction.state != HVUTIL_HOSTMSG_RECEIVED)
+ if (vss_get_state() != HVUTIL_HOSTMSG_RECEIVED)
return;
vss_msg = kzalloc(sizeof(*vss_msg), GFP_KERNEL);
@@ -167,13 +170,13 @@ static void vss_send_op(struct work_struct *dummy)
vss_msg->vss_hdr.operation = op;
- vss_transaction.state = HVUTIL_USERSPACE_REQ;
+ vss_set_state(HVUTIL_USERSPACE_REQ);
rc = hvutil_transport_send(hvt, vss_msg, sizeof(*vss_msg));
if (rc) {
pr_warn("VSS: failed to communicate to the daemon: %d\n", rc);
if (cancel_delayed_work_sync(&vss_timeout_work)) {
vss_respond_to_host(HV_E_FAIL);
- vss_transaction.state = HVUTIL_READY;
+ vss_set_state(HVUTIL_READY);
}
}
@@ -238,7 +241,7 @@ void hv_vss_onchannelcallback(void *context)
struct icmsg_hdr *icmsghdrp;
struct icmsg_negotiate *negop = NULL;
- if (vss_transaction.state > HVUTIL_READY) {
+ if (vss_get_state() > HVUTIL_READY) {
/*
* We will defer processing this callback once
* the current transaction is complete.
@@ -288,12 +291,12 @@ void hv_vss_onchannelcallback(void *context)
*/
case VSS_OP_FREEZE:
case VSS_OP_THAW:
- if (vss_transaction.state < HVUTIL_READY) {
+ if (vss_get_state() < HVUTIL_READY) {
/* Userspace is not registered yet */
vss_respond_to_host(HV_E_FAIL);
return;
}
- vss_transaction.state = HVUTIL_HOSTMSG_RECEIVED;
+ vss_set_state(HVUTIL_HOSTMSG_RECEIVED);
schedule_work(&vss_send_op_work);
schedule_delayed_work(&vss_timeout_work,
VSS_USERSPACE_TIMEOUT);
@@ -332,7 +335,7 @@ static void vss_on_reset(void)
{
if (cancel_delayed_work_sync(&vss_timeout_work))
vss_respond_to_host(HV_E_FAIL);
- vss_transaction.state = HVUTIL_DEVICE_INIT;
+ vss_set_state(HVUTIL_DEVICE_INIT);
}
int
@@ -346,7 +349,7 @@ hv_vss_init(struct hv_util_service *srv)
* Defer processing channel callbacks until the daemon
* has registered.
*/
- vss_transaction.state = HVUTIL_DEVICE_INIT;
+ vss_set_state(HVUTIL_DEVICE_INIT);
hvt = hvutil_transport_init(vss_devname, CN_VSS_IDX, CN_VSS_VAL,
vss_on_msg, vss_on_reset);
@@ -358,7 +361,7 @@ hv_vss_init(struct hv_util_service *srv)
void hv_vss_deinit(void)
{
- vss_transaction.state = HVUTIL_DEVICE_DYING;
+ vss_set_state(HVUTIL_DEVICE_DYING);
cancel_delayed_work_sync(&vss_timeout_work);
cancel_work_sync(&vss_send_op_work);
hvutil_transport_destroy(hvt);
--
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