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authorRoland Dreier <roland@digitalvampire.org>2008-09-22 14:55:24 -0700
committerJesse Barnes <jbarnes@virtuousgeek.org>2008-10-20 10:54:24 -0700
commit50cbfa511a21cac1909b6b4c955fa39d1da81457 (patch)
tree80e7bec3fd285d2f118c63942fae34220a89356d /Documentation
parentec84f1268fcf16c4a852fdb38b3a541748644918 (diff)
downloadlinux-linaro-stable-50cbfa511a21cac1909b6b4c955fa39d1da81457.tar.gz
PCI: fix MSI-HOWTO.txt info about MSI-X MMIO space
The current MSI-HOWTO.txt says that device drivers should not request the memory space that contains MSI-X tables. This is because the original MSI-X implementation did a request_mem_region() on this space, but that code was removed long ago (in the pre-git era, in fact). Years after the code was changed, we might as well clean up the documention to avoid a confusing mention of requesting regions: drivers using MSI-X can just use pci_request_regions() just like any other driver, and so there's no need for MSI-HOWTO.txt to talk about this at all. Signed-off-by: Roland Dreier <roland@digitalvampire.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/MSI-HOWTO.txt6
1 files changed, 2 insertions, 4 deletions
diff --git a/Documentation/MSI-HOWTO.txt b/Documentation/MSI-HOWTO.txt
index a51f693c1541..256defd7e174 100644
--- a/Documentation/MSI-HOWTO.txt
+++ b/Documentation/MSI-HOWTO.txt
@@ -236,10 +236,8 @@ software system can set different pages for controlling accesses to the
MSI-X structure. The implementation of MSI support requires the PCI
subsystem, not a device driver, to maintain full control of the MSI-X
table/MSI-X PBA (Pending Bit Array) and MMIO address space of the MSI-X
-table/MSI-X PBA. A device driver is prohibited from requesting the MMIO
-address space of the MSI-X table/MSI-X PBA. Otherwise, the PCI subsystem
-will fail enabling MSI-X on its hardware device when it calls the function
-pci_enable_msix().
+table/MSI-X PBA. A device driver should not access the MMIO address
+space of the MSI-X table/MSI-X PBA.
5.3.2 API pci_enable_msix