linux-kernel - [PATCH AUTOSEL 5.10 28/41] PCI: hv: Add check for hyperv_initialized in init_hv_pci

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Date:   Mon,  5 Jul 2021 11:29:48 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Haiyang Zhang <haiyangz@...rosoft.com>,
        Mohammad Alqayeem <mohammad.alqyeem@...anix.com>,
        Wei Liu <wei.liu@...nel.org>, Sasha Levin <sashal@...nel.org>,
        linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 28/41] PCI: hv: Add check for hyperv_initialized in init_hv_pci_drv()

From: Haiyang Zhang <haiyangz@...rosoft.com>

[ 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@...rosoft.com>
Reported-and-tested-by: Mohammad Alqayeem <mohammad.alqyeem@...anix.com>
Reviewed-by: Wei Liu <wei.liu@...nel.org>
Link: https://lore.kernel.org/r/1621984653-1210-1-git-send-email-haiyangz@microsoft.com
Signed-off-by: Wei Liu <wei.liu@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 03ed5cb1c4b2..d57c538bbb2d 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -3480,6 +3480,9 @@ 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