BUS_FOR_EACH_DEV - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Device drivers infrastructure

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NAMEbus_for_each_dev − device iterator​.

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SYNOPSISint bus_for_each_dev(struct bus_type * bus, struct device * start, void * data, int (*fn) (struct device *, void *));

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ARGUMENTSbus bus type​. start device to start iterating from​. data data for the callback​. fn function to be called for each device​.

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DESCRIPTIONIterate over bus´s list of devices, and call fn for each, passing it data​. If start is not NULL, we use that device to begin iterating from​. We check the return of fn each time​. If it returns anything other than 0, we break out and return that value​.

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NOTEThe device that returns a non−zero value is not retained in any way, nor is its refcount incremented​. If the caller needs to retain this data, it should do so, and increment the reference count in the supplied callback​.

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