Drivers: hv: vmbus: Release cpu lock in error case

[ 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>

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index ce76fc3..0700301 100644 (file)
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -637,6 +637,7 @@ 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.