linux-kernel - [PATCH] PCI: Do not enable INTx in pci_reenable

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Message-ID: <20140311174809.23257.77363.stgit@bhelgaas-glaptop.roam.corp.google.com>
Date:	Tue, 11 Mar 2014 11:48:09 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	linux-pci@...r.kernel.org
Cc:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-kernel@...r.kernel.org,
	Chris Cheng <chris.cheng@...ustcorp.com>,
	Jamie Chen <jamie.chen@...el.com>,
	Andreas Noever <andreas.noever@...il.com>
Subject: [PATCH] PCI: Do not enable INTx in pci_reenable_device()

Andreas reported that after 1f42db786b14 ("PCI: Enable INTx if BIOS left
them disabled"), pciehp surprise removal stopped working.

This happens because pci_reenable_device() on the hotplug bridge (used in
the pciehp_configure_device() path) clears the Interrupt Disable bit, which
apparently breaks the bridge's MSI hotplug event reporting.

Previously we cleared the Interrupt Disable bit in do_pci_enable_device(),
which is used by both pci_enable_device() and pci_reenable_device().  But
we use pci_reenable_device() after the driver may have enabled MSI or
MSI-X, and we *set* Interrupt Disable as part of enabling MSI/MSI-X.

This patch clears Interrupt Disable only when MSI/MSI-X has not been
enabled.

Fixes: 1f42db786b14 PCI: Enable INTx if BIOS left them disabled
Link: https://bugzilla.kernel.org/show_bug.cgi?id=71691
Reported-and-tested-by: Andreas Noever <andreas.noever@...il.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
CC: stable@...r.kernel.org
CC: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
---
 drivers/pci/pci.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 8dc3e701ec57..79fc89c6c3f3 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1192,6 +1192,9 @@ static int do_pci_enable_device(struct pci_dev *dev, int bars)
 		return err;
 	pci_fixup_device(pci_fixup_enable, dev);

+	if (dev->msi_enabled || dev->msix_enabled)
+		return 0;
+
 	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
 	if (pin) {
 		pci_read_config_word(dev, PCI_COMMAND, &cmd);

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