X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Documentation%2Fpci.txt;h=3242e5c1ee9cc27330a03494a1f1d48e50cb7300;hb=41542dbe12e34165e586de1e3fe0a245707aa39e;hp=66bbbf1d1ef64e90cede27c2738290c5d6b4c2ef;hpb=1fb5fef9b80d9a3b5368e22031627afd1585487b;p=linux-2.6

diff --git a/Documentation/pci.txt b/Documentation/pci.txt
index 66bbbf1d1e..3242e5c1ee 100644
--- a/Documentation/pci.txt
+++ b/Documentation/pci.txt
@@ -213,9 +213,17 @@ have been remapped by the kernel.
 
    See Documentation/IO-mapping.txt for how to access device memory.
 
-   You still need to call request_region() for I/O regions and
-request_mem_region() for memory regions to make sure nobody else is using the
-same device.
+   The device driver needs to call pci_request_region() to make sure
+no other device is already using the same resource. The driver is expected
+to determine MMIO and IO Port resource availability _before_ calling
+pci_enable_device().  Conversely, drivers should call pci_release_region()
+_after_ calling pci_disable_device(). The idea is to prevent two devices
+colliding on the same address range.
+
+Generic flavors of pci_request_region() are request_mem_region()
+(for MMIO ranges) and request_region() (for IO Port ranges).
+Use these for address resources that are not described by "normal" PCI
+interfaces (e.g. BAR).
 
    All interrupt handlers should be registered with SA_SHIRQ and use the devid
 to map IRQs to devices (remember that all PCI interrupts are shared).