[PATCH] PCI: hv: Fix double ida_free in hv_pci_probe error path

[Sahil Chandna]

If hv_pci_probe() fails after storing the domain number in
hbus->bridge->domain_nr, there is a call to free this domain_nr via
pci_bus_release_emul_domain_nr(), however, during cleanup, the bridge
release callback pci_release_host_bridge_dev() also frees the domain_nr
causing ida_free to be called on same ID twice and triggering following
warning:

  ida_free called for id=28971 which is not allocated.
  WARNING: lib/idr.c:594 at ida_free+0xdf/0x160, CPU#0: kworker/0:2/198
  Call Trace:
   pci_bus_release_emul_domain_nr+0x17/0x20
   pci_release_host_bridge_dev+0x4b/0x60
   device_release+0x3b/0xa0
   kobject_put+0x8e/0x220
   devm_pci_alloc_host_bridge_release+0xe/0x20
   devres_release_all+0x9a/0xd0
   device_unbind_cleanup+0x12/0xa0
   really_probe+0x1c5/0x3f0
   vmbus_add_channel_work+0x135/0x1a0

Fix this by letting pci core handle the free domain_nr and remove
the explicit free called in pci-hyperv driver.

Fixes: bcce8c74f1ce ("PCI: Enable host bridge emulation for PCI_DOMAINS_GENERIC platforms")
Signed-off-by: Sahil Chandna <sahilchandna@xxxxxxxxxxxxxxxxxxx>
---
 drivers/pci/controller/pci-hyperv.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index 2c7a406b4ba8..5616ad5d2a8f 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -3778,7 +3778,7 @@ static int hv_pci_probe(struct hv_device *hdev,
 					   hbus->bridge->domain_nr);
 	if (!hbus->wq) {
 		ret = -ENOMEM;
-		goto free_dom;
+		goto free_bus;
 	}

 	hdev->channel->next_request_id_callback = vmbus_next_request_id;
@@ -3874,8 +3874,6 @@ static int hv_pci_probe(struct hv_device *hdev,
 	vmbus_close(hdev->channel);
 destroy_wq:
 	destroy_workqueue(hbus->wq);
-free_dom:
-	pci_bus_release_emul_domain_nr(hbus->bridge->domain_nr);
 free_bus:
 	kfree(hbus);
 	return ret;
--
2.53.0