centos man page for mdiobus_read

MDIOBUS_READ(9) 					      Network device support						   MDIOBUS_READ(9)

NAME
       mdiobus_read - Convenience function for reading a given MII mgmt register

SYNOPSIS
       int mdiobus_read(struct mii_bus * bus, int addr, u32 regnum);

ARGUMENTS
       bus
	   the mii_bus struct

       addr
	   the phy address

       regnum
	   register number to read

NOTE
       MUST NOT be called from interrupt context, because the bus read/write functions may wait for an interrupt to conclude the operation.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							   MDIOBUS_READ(9)