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| author | Alex Ng <alexng@messages.microsoft.com> | 2016-11-06 13:14:10 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-11-07 10:01:17 +0100 |
| commit | 23d2cc0c29eb0e7c6fe4cac88098306c31c40208 (patch) | |
| tree | 5838409103ee55bb95cb3e73ce091c48d1b13b2b /drivers/hv | |
| parent | b3bb97b8a49f3c489134793705bc636c7883e777 (diff) | |
| download | linux-23d2cc0c29eb0e7c6fe4cac88098306c31c40208.tar.bz2 | |
Drivers: hv: vss: Improve log messages.
Adding log messages to help troubleshoot error cases and transaction
handling.
Signed-off-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
| -rw-r--r-- | drivers/hv/hv_snapshot.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c index a6707133c297..5c95ba1e2ecf 100644 --- a/drivers/hv/hv_snapshot.c +++ b/drivers/hv/hv_snapshot.c @@ -120,7 +120,7 @@ static int vss_handle_handshake(struct hv_vss_msg *vss_msg) default: return -EINVAL; } - pr_debug("VSS: userspace daemon ver. %d connected\n", dm_reg_value); + pr_info("VSS: userspace daemon ver. %d connected\n", dm_reg_value); return 0; } @@ -128,8 +128,10 @@ static int vss_on_msg(void *msg, int len) { struct hv_vss_msg *vss_msg = (struct hv_vss_msg *)msg; - if (len != sizeof(*vss_msg)) + if (len != sizeof(*vss_msg)) { + pr_debug("VSS: Message size does not match length\n"); return -EINVAL; + } if (vss_msg->vss_hdr.operation == VSS_OP_REGISTER || vss_msg->vss_hdr.operation == VSS_OP_REGISTER1) { @@ -137,8 +139,11 @@ 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_transaction.state > HVUTIL_READY) { + pr_debug("VSS: Got unexpected registration request\n"); return -EINVAL; + } + return vss_handle_handshake(vss_msg); } else if (vss_transaction.state == HVUTIL_USERSPACE_REQ) { vss_transaction.state = HVUTIL_USERSPACE_RECV; @@ -155,7 +160,7 @@ static int vss_on_msg(void *msg, int len) } } else { /* This is a spurious call! */ - pr_warn("VSS: Transaction not active\n"); + pr_debug("VSS: Transaction not active\n"); return -EINVAL; } return 0; @@ -168,8 +173,10 @@ static void vss_send_op(void) struct hv_vss_msg *vss_msg; /* The transaction state is wrong. */ - if (vss_transaction.state != HVUTIL_HOSTMSG_RECEIVED) + if (vss_transaction.state != HVUTIL_HOSTMSG_RECEIVED) { + pr_debug("VSS: Unexpected attempt to send to daemon\n"); return; + } vss_msg = kzalloc(sizeof(*vss_msg), GFP_KERNEL); if (!vss_msg) @@ -210,9 +217,13 @@ static void vss_handle_request(struct work_struct *dummy) case VSS_OP_HOT_BACKUP: if (vss_transaction.state < HVUTIL_READY) { /* Userspace is not registered yet */ + pr_debug("VSS: Not ready for request.\n"); vss_respond_to_host(HV_E_FAIL); return; } + + pr_debug("VSS: Received request for op code: %d\n", + vss_transaction.msg->vss_hdr.operation); vss_transaction.state = HVUTIL_HOSTMSG_RECEIVED; vss_send_op(); return; @@ -353,8 +364,10 @@ hv_vss_init(struct hv_util_service *srv) hvt = hvutil_transport_init(vss_devname, CN_VSS_IDX, CN_VSS_VAL, vss_on_msg, vss_on_reset); - if (!hvt) + if (!hvt) { + pr_warn("VSS: Failed to initialize transport\n"); return -EFAULT; + } return 0; } |