centos man page for ata_xfer_mode2shift

ATA_XFER_MODE2SHIFT(9)						  libata Library					    ATA_XFER_MODE2SHIFT(9)

NAME
       ata_xfer_mode2shift - Find matching xfer_shift for XFER_*

SYNOPSIS
       int ata_xfer_mode2shift(unsigned long xfer_mode);

ARGUMENTS
       xfer_mode
	   XFER_* of interest

DESCRIPTION
       Return matching xfer_shift for xfer_mode.

LOCKING
       None.

RETURNS
       Matching xfer_shift, -1 if no match found.

AUTHOR
       Jeff Garzik
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						    ATA_XFER_MODE2SHIFT(9)