[PATCH 2/2] Drivers: hv: vmbus: Log on missing offers

[Naman Jain]

From: John Starks <josta...@microsoft.com>

When resuming from hibernation, log any channels that were present
before hibernation but now are gone.

Signed-off-by: John Starks <josta...@microsoft.com>
Co-developed-by: Naman Jain <namj...@linux.microsoft.com>
Signed-off-by: Naman Jain <namj...@linux.microsoft.com>
---
 drivers/hv/vmbus_drv.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index bd3fc41dc06b..1f56d138210e 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -2462,6 +2462,7 @@ static int vmbus_bus_suspend(struct device *dev)
 
 static int vmbus_bus_resume(struct device *dev)
 {
+       struct vmbus_channel *channel;
        struct vmbus_channel_msginfo *msginfo;
        size_t msgsize;
        int ret;
@@ -2494,6 +2495,21 @@ static int vmbus_bus_resume(struct device *dev)
 
        vmbus_request_offers();
 
+       mutex_lock(&vmbus_connection.channel_mutex);
+       list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
+               if (channel->offermsg.child_relid != INVALID_RELID)
+                       continue;
+
+               /* hvsock channels are not expected to be present. */
+               if (is_hvsock_channel(channel))
+                       continue;
+
+               pr_err("channel %pUl/%pUl not present after resume.\n",
+                       &channel->offermsg.offer.if_type,
+                       &channel->offermsg.offer.if_instance);
+       }
+       mutex_unlock(&vmbus_connection.channel_mutex);
+
        /* Reset the event for the next suspend. */
        reinit_completion(&vmbus_connection.ready_for_suspend_event);
 
-- 
2.34.1