Messages in this thread Patch in this message | | | Subject | [PATCH] PCI: Do not enable INTx in pci_reenable_device() | From | Bjorn Helgaas <> | Date | Tue, 11 Mar 2014 11:48:09 -0600 |
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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@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org CC: Sarah Sharp <sarah.a.sharp@linux.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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