linux-kernel - [PATCH] PCI/PM: Call .bridge

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Date:   Tue, 14 Apr 2020 19:06:35 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     linux-pci@...r.kernel.org
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH] PCI/PM: Call .bridge_d3() hook only if non-NULL

From: Bjorn Helgaas <bhelgaas@...gle.com>

26ad34d510a8 ("PCI / ACPI: Whitelist D3 for more PCIe hotplug ports") added
the struct pci_platform_pm_ops.bridge_d3() function pointer and
platform_pci_bridge_d3() to use it.

The .bridge_d3() op is implemented by acpi_pci_platform_pm, but not by
mid_pci_platform_pm.  We don't expect platform_pci_bridge_d3() to be called
on Intel MID platforms, but nothing in the code itself would prevent that.

Check the .bridge_d3() pointer for NULL before calling it.

Fixes: 26ad34d510a8 ("PCI / ACPI: Whitelist D3 for more PCIe hotplug ports")
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/pci/pci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 595fcf59843f..dfa7ec008963 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -868,7 +868,9 @@ static inline bool platform_pci_need_resume(struct pci_dev *dev)
 
 static inline bool platform_pci_bridge_d3(struct pci_dev *dev)
 {
-	return pci_platform_pm ? pci_platform_pm->bridge_d3(dev) : false;
+	if (pci_platform_pm && pci_platform_pm->bridge_d3)
+		return pci_platform_pm->bridge_d3(dev);
+	return false;
 }
 
 /**
-- 
2.26.0.110.g2183baf09c-goog