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authorBjorn Helgaas <bhelgaas@google.com>2016-02-17 12:26:42 -0600
committerBjorn Helgaas <bhelgaas@google.com>2016-02-27 08:52:20 -0600
commit6c777e8799a93e3bdb67bec622429e1b48dc90fb (patch)
tree8ae158e261d35760cacf63fb1b400eabf0e4d80f /drivers/acpi
parent67b4eab91caf2ad574cab1b17ae09180ea2e116e (diff)
downloadtalos-obmc-linux-6c777e8799a93e3bdb67bec622429e1b48dc90fb.tar.gz
talos-obmc-linux-6c777e8799a93e3bdb67bec622429e1b48dc90fb.zip
Revert "PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()"
991de2e59090 ("PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()") appeared in v4.3 and helps support IOAPIC hotplug. Олег reported that the Elcus-1553 TA1-PCI driver worked in v4.2 but not v4.3 and bisected it to 991de2e59090. Sunjin reported that the RocketRAID 272x driver worked in v4.2 but not v4.3. In both cases booting with "pci=routirq" is a workaround. I think the problem is that after 991de2e59090, we no longer call pcibios_enable_irq() for upstream bridges. Prior to 991de2e59090, when a driver called pci_enable_device(), we recursively called pcibios_enable_irq() for upstream bridges via pci_enable_bridge(). After 991de2e59090, we call pcibios_enable_irq() from pci_device_probe() instead of the pci_enable_device() path, which does *not* call pcibios_enable_irq() for upstream bridges. Revert 991de2e59090 to fix these driver regressions. Link: https://bugzilla.kernel.org/show_bug.cgi?id=111211 Fixes: 991de2e59090 ("PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()") Reported-and-tested-by: Олег Мороз <oleg.moroz@mcc.vniiem.ru> Reported-by: Sunjin Yang <fan4326@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael@kernel.org> CC: Jiang Liu <jiang.liu@linux.intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/pci_irq.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index 9032db7e4b3a..c8e169e46673 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -478,6 +478,14 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
if (!pin || !dev->irq_managed || dev->irq <= 0)
return;
+ /* Keep IOAPIC pin configuration when suspending */
+ if (dev->dev.power.is_prepared)
+ return;
+#ifdef CONFIG_PM
+ if (dev->dev.power.runtime_status == RPM_SUSPENDING)
+ return;
+#endif
+
entry = acpi_pci_irq_lookup(dev, pin);
if (!entry)
return;
@@ -498,6 +506,5 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
if (gsi >= 0) {
acpi_unregister_gsi(gsi);
dev->irq_managed = 0;
- dev->irq = 0;
}
}
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