Commit 3cace4a61610 ("Drivers: hv: utils: run polling callback always in
interrupt context") removed direct *_transaction.state = HVUTIL_READY
assignments from *_handle_handshake() functions introducing the following
race: if a userspace daemon connects before we get first non-negotiation
request from the server hv_poll_channel() won't set transaction state to
HVUTIL_READY as (!channel) condition will fail, we set it to non-NULL on
the first real request from the server. Solve the issue by transferring
the transaction state to HVUTIL_READY directly from all handshake
functions.
Fixes: 3cace4a61610 ("Drivers: hv: utils: run polling callback always in
interrupt context")
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
drivers/hv/hv_fcopy.c | 1 +
drivers/hv/hv_kvp.c | 1 +
drivers/hv/hv_snapshot.c | 1 +
3 files changed, 3 insertions(+)
diff --git a/drivers/hv/hv_fcopy.c b/drivers/hv/hv_fcopy.c
index c37a71e..e18b85b 100644
--- a/drivers/hv/hv_fcopy.c
+++ b/drivers/hv/hv_fcopy.c
@@ -108,6 +108,7 @@ static int fcopy_handle_handshake(u32 version)
return -EINVAL;
}
pr_debug("FCP: userspace daemon ver. %d registered\n", version);
+ fcopy_transaction.state = HVUTIL_READY;
hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
return 0;
}
diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index d4ab81b..1162afb 100644
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -154,6 +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;
diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c
index 67def4a..489203b 100644
--- a/drivers/hv/hv_snapshot.c
+++ b/drivers/hv/hv_snapshot.c
@@ -113,6 +113,7 @@ static int vss_handle_handshake(struct hv_vss_msg *vss_msg)
default:
return -EINVAL;
}
+ vss_transaction.state = HVUTIL_READY;
hv_poll_channel(vss_transaction.recv_channel, vss_poll_wrapper);
pr_debug("VSS: userspace daemon ver. %d registered\n", dm_reg_value);
return 0;
--
2.5.0
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