lkml.org 
[lkml]   [2020]   [Apr]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] PCI/PM: Call .bridge_d3() hook only if non-NULL
Date
From: Bjorn Helgaas <bhelgaas@google.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@google.com>
Cc: Mika Westerberg <mika.westerberg@linux.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
\
 
 \ /
  Last update: 2020-04-15 02:08    [W:0.090 / U:1.052 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site