This is a note to let you know that I've just added the patch titled
MISC: hpilo, remove pci_disable_device
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
misc-hpilo-remove-pci_disable_device.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 499f98ab5a0bd25310fe45b93baa524aae61d7cc Mon Sep 17 00:00:00 2001
From: Jiri Slaby <jslaby@xxxxxxx>
Date: Thu, 13 Sep 2012 16:06:48 +0200
Subject: MISC: hpilo, remove pci_disable_device
From: Jiri Slaby <jslaby@xxxxxxx>
commit bcdee04ea7ae0406ae69094f6df1aacb66a69a0b upstream.
pci_disable_device(pdev) used to be in pci remove function. But this
PCI device has two functions with interrupt lines connected to a
single pin. The other one is a USB host controller. So when we disable
the PIN there e.g. by rmmod hpilo, the controller stops working. It is
because the interrupt link is disabled in ACPI since it is not
refcounted yet. See acpi_pci_link_free_irq called from
acpi_pci_irq_disable.
It is not the best solution whatsoever, but as a workaround until the
ACPI irq link refcounting is sorted out this should fix the reported
errors.
References: https://lkml.org/lkml/2008/11/4/535
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
Cc: Grant Grundler <grundler@xxxxxxxxxxxxxxxx>
Cc: Nobin Mathew <nobin.mathew@xxxxxxxxx>
Cc: Robert Hancock <hancockr@xxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: David Altobelli <david.altobelli@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Qiang Huang <h.huangqiang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/hpilo.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
--- a/drivers/misc/hpilo.c
+++ b/drivers/misc/hpilo.c
@@ -735,7 +735,14 @@ static void ilo_remove(struct pci_dev *p
free_irq(pdev->irq, ilo_hw);
ilo_unmap_device(pdev, ilo_hw);
pci_release_regions(pdev);
- pci_disable_device(pdev);
+ /*
+ * pci_disable_device(pdev) used to be here. But this PCI device has
+ * two functions with interrupt lines connected to a single pin. The
+ * other one is a USB host controller. So when we disable the PIN here
+ * e.g. by rmmod hpilo, the controller stops working. It is because
+ * the interrupt link is disabled in ACPI since it is not refcounted
+ * yet. See acpi_pci_link_free_irq called from acpi_pci_irq_disable.
+ */
kfree(ilo_hw);
ilo_hwdev[(minor / MAX_CCB)] = 0;
}
@@ -820,7 +827,7 @@ unmap:
free_regions:
pci_release_regions(pdev);
disable:
- pci_disable_device(pdev);
+/* pci_disable_device(pdev); see comment in ilo_remove */
free:
kfree(ilo_hw);
out:
Patches currently in stable-queue which might be from jslaby@xxxxxxx are
queue-3.4/misc-hpilo-remove-pci_disable_device.patch
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