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

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Message-ID: <20200415072906.GS2586@lahna.fi.intel.com>
Date:   Wed, 15 Apr 2020 10:29:06 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH] PCI/PM: Call .bridge_d3() hook only if non-NULL

On Tue, Apr 14, 2020 at 07:06:35PM -0500, Bjorn Helgaas wrote:
> 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>

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

Thanks!