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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
commit03dd4cb26d967f9588437b0fc9cc0e8353322bb7 (patch)
treefa581f6dc1c0596391690d1f67eceef3af8246dc /drivers/hv/hv_kvp.c
parentd4e493caf788ef44982e131ff9c786546904d934 (diff)
Linux-libre 4.5-gnu
Diffstat (limited to 'drivers/hv/hv_kvp.c')
-rw-r--r--drivers/hv/hv_kvp.c33
1 files changed, 13 insertions, 20 deletions
diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index 74c38a9f3..d4ab81bcd 100644
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -66,7 +66,6 @@ static struct {
struct hv_kvp_msg *kvp_msg; /* current message */
struct vmbus_channel *recv_channel; /* chn we got the request */
u64 recv_req_id; /* request ID. */
- void *kvp_context; /* for the channel callback */
} kvp_transaction;
/*
@@ -94,6 +93,13 @@ static struct hvutil_transport *hvt;
*/
#define HV_DRV_VERSION "3.1"
+static void kvp_poll_wrapper(void *channel)
+{
+ /* Transaction is finished, reset the state here to avoid races. */
+ kvp_transaction.state = HVUTIL_READY;
+ hv_kvp_onchannelcallback(channel);
+}
+
static void
kvp_register(int reg_value)
{
@@ -121,12 +127,7 @@ 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;
-
- hv_poll_channel(kvp_transaction.kvp_context,
- hv_kvp_onchannelcallback);
+ hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
}
static int kvp_handle_handshake(struct hv_kvp_msg *msg)
@@ -153,7 +154,7 @@ 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;
+ hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
return 0;
}
@@ -218,9 +219,7 @@ 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;
- hv_poll_channel(kvp_transaction.kvp_context,
- hv_kvp_onchannelcallback);
+ hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
}
return 0;
@@ -596,15 +595,8 @@ void hv_kvp_onchannelcallback(void *context)
int util_fw_version;
int kvp_srv_version;
- if (kvp_transaction.state > HVUTIL_READY) {
- /*
- * We will defer processing this callback once
- * the current transaction is complete.
- */
- kvp_transaction.kvp_context = context;
+ if (kvp_transaction.state > HVUTIL_READY)
return;
- }
- kvp_transaction.kvp_context = NULL;
vmbus_recvpacket(channel, recv_buffer, PAGE_SIZE * 4, &recvlen,
&requestid);
@@ -668,7 +660,8 @@ void hv_kvp_onchannelcallback(void *context)
* user-mode not responding.
*/
schedule_work(&kvp_sendkey_work);
- schedule_delayed_work(&kvp_timeout_work, 5*HZ);
+ schedule_delayed_work(&kvp_timeout_work,
+ HV_UTIL_TIMEOUT * HZ);
return;