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| author | Bjorn Helgaas <bjorn.helgaas@hp.com> | 2004-06-11 03:15:00 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <greg@kroah.com> | 2004-06-11 03:15:00 -0700 |
| commit | 42d5f1e11922ef68a9604c7655b778cb8c8765b7 (patch) | |
| tree | 7cb44d643999b3e7bfa59a68fcb49156e8b51d5d /Documentation | |
| parent | f5bfafe34c580d0364b547e9e593aa25cf06d8b1 (diff) | |
| download | history-42d5f1e11922ef68a9604c7655b778cb8c8765b7.tar.gz | |
[PATCH] PCI: clarify pci.txt wrt IRQ allocation
I think we should make it explicit that PCI IRQs shouldn't be relied
upon until after pci_enable_device(). This patch:
ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.7-rc3/2.6.7-rc3-mm1/broken-out/bk-acpi.patch
does PCI interrupt routing (based on ACPI _PRT) and IRQ allocation
at pci_enable_device()-time.
(To avoid breaking things in 2.6, the above patch still allocates
all PCI IRQs in pci_acpi_init(), before any drivers are initialized.
But that shouldn't be needed by correct drivers, and I'd like to
remove it in 2.7.)
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/pci.txt | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/pci.txt b/Documentation/pci.txt index d30dc107ac62a1..41194763862ba8 100644 --- a/Documentation/pci.txt +++ b/Documentation/pci.txt @@ -166,8 +166,9 @@ count on these devices by calling pci_dev_put(). ~~~~~~~~~~~~~~~~~~~ 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, assigns missing resources if needed and wakes up the device -if it was in suspended state. Please note that this function can fail. +the device, allocates an IRQ if necessary, assigns missing resources if +needed and wakes up the device if it was in suspended state. Please note +that this function can fail. If you want to use the device in bus mastering mode, call pci_set_master() which enables the bus master bit in PCI_COMMAND register and also fixes |