Handling Resource Allocation Failures
The resource-allocation routines provide the driver with several options when handling allocation failures. The waitfp argument indicates whether the allocation routines block, return immediately, or schedule a callback, as shown in the following table.
Table 9–1 Resource Allocation Handling|
waitfp value |
Indicated Action |
|---|---|
|
DDI_DMA_DONTWAIT |
Driver does not want to wait for resources to become available |
|
DDI_DMA_SLEEP |
Driver is willing to wait indefinitely for resources to become available |
|
Other values |
The address of a function to be called when resources are likely to be available |
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