[PATCH 5.13 244/800] PCI: hv: Add check for hyperv_initialized in init_hv_pci_drv()

[Greg Kroah-Hartman]

From: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>

[ Upstream commit 7d815f4afa87f2032b650ae1bba7534b550a6b8b ]

Add check for hv_is_hyperv_initialized() at the top of
init_hv_pci_drv(), so if the pci-hyperv driver is force-loaded on non
Hyper-V platforms, the init_hv_pci_drv() will exit immediately, without
any side effects, like assignments to hvpci_block_ops, etc.

Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Reported-and-tested-by: Mohammad Alqayeem <mohammad.alqyeem@xxxxxxxxxxx>
Reviewed-by: Wei Liu <wei.liu@xxxxxxxxxx>
Link: https://lore.kernel.org/r/1621984653-1210-1-git-send-email-haiyangz@xxxxxxxxxxxxx
Signed-off-by: Wei Liu <wei.liu@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/pci/controller/pci-hyperv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index 6511648271b2..bebe3eeebc4e 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -3476,6 +3476,9 @@ static void __exit exit_hv_pci_drv(void)
 
 static int __init init_hv_pci_drv(void)
 {
+	if (!hv_is_hyperv_initialized())
+		return -ENODEV;
+
 	/* Set the invalid domain number's bit, so it will not be used */
 	set_bit(HVPCI_DOM_INVALID, hvpci_dom_map);
 
-- 
2.30.2