[PATCH 5.10 41/84] Drivers: hv: vmbus: Release cpu lock in error case

Greg Kroah-Hartman
2022-06-20T13:17:17Z

From: Saurabh Sengar <ssengar@linux.microsoft.com>

[ Upstream commit 656c5ba50b7172a0ea25dc1b37606bd51d01fe8d ]

In case of invalid sub channel, release cpu lock before returning.

Fixes: a949e86c0d780 ("Drivers: hv: vmbus: Resolve race between init_vp_index() and CPU hotplug")
Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1654794996-13244-1-git-send-email-ssengar@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/hv/channel_mgmt.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 5dbb949b1afd..10188b1a6a08 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -606,6 +606,7 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel)
*/
if (newchannel->offermsg.offer.sub_channel_index == 0) {
mutex_unlock(&vmbus_connection.channel_mutex);
+ cpus_read_unlock();
/*
* Don't call free_channel(), because newchannel->kobj
* is not initialized yet.
--
2.35.1