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SubjectRe: [PATCH] PCI and I2C fixes for 2.6.8
ChangeSet 1.1807.56.19, 2004/08/05 15:34:23-07:00,

[PATCH] PCI: Document pci_disable_device()

Add documentation for pci_disable_device(). We don't actually
deallocate IRQ resources in pci_disable_device() yet, but I suspect
we'll need to do so soon.

Signed-off-by: Bjorn Helgaas <>
Signed-off-by: Greg Kroah-Hartman <>

Documentation/pci.txt | 11 +++++++++--
1 files changed, 9 insertions(+), 2 deletions(-)

diff -Nru a/Documentation/pci.txt b/Documentation/pci.txt
--- a/Documentation/pci.txt 2004-08-23 11:05:10 -07:00
+++ b/Documentation/pci.txt 2004-08-23 11:05:10 -07:00
@@ -25,6 +25,7 @@
Discover resources (addresses and IRQ numbers) provided by the device
Allocate these resources
Communicate with the device
+ Disable the device

Most of these topics are covered by the following sections, for the rest
look at <linux/pci.h>, it's hopefully well commented.
@@ -162,8 +163,8 @@
count on these devices by calling pci_dev_put().

-3. Enabling devices
+3. Enabling and disabling devices
Before you do anything with the device you've found, you need to enable
it by calling pci_enable_device() which enables I/O and memory regions of
the device, allocates an IRQ if necessary, assigns missing resources if
@@ -179,6 +180,12 @@
and also ensures that the cache line size register is set correctly.
Make sure to check the return value of pci_set_mwi(), not all architectures
may support Memory-Write-Invalidate.
+ If your driver decides to stop using the device (e.g., there was an
+error while setting it up or the driver module is being unloaded), it
+should call pci_disable_device() to deallocate any IRQ resources, disable
+PCI bus-mastering, etc. You should not do anything with the device after
+calling pci_disable_device().

4. How to access PCI config space
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