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The Fourier transform (FT) decomposes a function of time (a signal) into its constituent frequencies.
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pci_clear_master(9) [centos man page]

PCI_CLEAR_MASTER(9)						Hardware Interfaces					       PCI_CLEAR_MASTER(9)

NAME
pci_clear_master - disables bus-mastering for device dev SYNOPSIS
void pci_clear_master(struct pci_dev * dev); ARGUMENTS
dev the PCI device to disable COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 PCI_CLEAR_MASTER(9)

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STRUCT 
BUS_TYPE(9) Device drivers infrastructure STRUCT BUS_TYPE(9) NAME
struct_bus_type - The bus type of the device SYNOPSIS
struct bus_type { const char * name; const char * dev_name; struct device * dev_root; struct bus_attribute * bus_attrs; struct device_attribute * dev_attrs; struct driver_attribute * drv_attrs; const struct attribute_group ** bus_groups; const struct attribute_group ** dev_groups; const struct attribute_group ** drv_groups; int (* match) (struct device *dev, struct device_driver *drv); int (* uevent) (struct device *dev, struct kobj_uevent_env *env); int (* probe) (struct device *dev); int (* remove) (struct device *dev); void (* shutdown) (struct device *dev); int (* online) (struct device *dev); int (* offline) (struct device *dev); int (* suspend) (struct device *dev, pm_message_t state); int (* resume) (struct device *dev); const struct dev_pm_ops * pm; struct iommu_ops * iommu_ops; struct subsys_private * p; }; MEMBERS
name The name of the bus. dev_name Used for subsystems to enumerate devices like ("foou", dev->id). dev_root Default device to use as the parent. bus_attrs Default attributes of the bus. dev_attrs Default attributes of the devices on the bus. drv_attrs Default attributes of the device drivers on the bus. bus_groups Default attributes of the bus. dev_groups Default attributes of the devices on the bus. drv_groups Default attributes of the device drivers on the bus. match Called, perhaps multiple times, whenever a new device or driver is added for this bus. It should return a nonzero value if the given device can be handled by the given driver. uevent Called when a device is added, removed, or a few other things that generate uevents to add the environment variables. probe Called when a new device or driver add to this bus, and callback the specific driver's probe to initial the matched device. remove Called when a device removed from this bus. shutdown Called at shut-down time to quiesce the device. online Called to put the device back online (after offlining it). offline Called to put the device offline for hot-removal. May fail. suspend Called when a device on this bus wants to go to sleep mode. resume Called to bring a device on this bus out of sleep mode. pm Power management operations of this bus, callback the specific device driver's pm-ops. iommu_ops IOMMU specific operations for this bus, used to attach IOMMU driver implementations to a bus and allow the driver to do bus-specific setup p The private data of the driver core, only the driver core can touch this. DESCRIPTION
A bus is a channel between the processor and one or more devices. For the purposes of the device model, all devices are connected via a bus, even if it is an internal, virtual, "platform" bus. Buses can plug into each other. A USB controller is usually a PCI device, for example. The device model represents the actual connections between buses and the devices they control. A bus is represented by the bus_type structure. It contains the name, the default attributes, the bus' methods, PM operations, and the driver core's private data. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT BUS_TYPE(9)

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