diff options
| author | Bjorn Helgaas <bhelgaas@google.com> | 2014-03-11 14:22:19 -0600 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-03-24 09:44:57 +0100 |
| commit | 16cd17980ba1e24c2bfef4182f43487fac62a7a1 (patch) | |
| tree | 77bdcb9d46692531d3f91c1f7c60ba78be3e119d | |
| parent | 8df3fd9ab9f107e78855bf52d48e1e99e5d931b3 (diff) | |
PCI: Enable INTx in pci_reenable_device() only when MSI/MSI-X not enabled
commit 3cdeb713dc66057b50682048c151eae07b186c42 upstream.
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: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | drivers/pci/pci.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 532991bd1dc..9fc3f1f4557 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1131,6 +1131,9 @@ 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); |