linux

iv/linux

History

Bjorn Helgaas c1491657c5 Revert "PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()"

commit 6c777e8799a93e3bdb67bec622429e1b48dc90fb upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2016-04-20 15:42:16 +09:00

alpha

mm: mlock: add mlock flags to enable VM_LOCKONFAULT usage

2015-11-05 19:34:48 -08:00

arc

ARC: bitops: Remove non relevant comments

2016-04-12 09:08:56 -07:00

arm

ARM: dts: at91: sama5d4 Xplained: don't disable hsmci regulator

2016-04-12 09:09:03 -07:00

arm64

arm64: replace read_lock to rcu lock in call_step_hook