Commit ea6ce53c authored by Elias Oltmanns's avatar Elias Oltmanns Committed by Jeff Garzik
Browse files

[libata] Introduce ata_id_has_unload() 



Add a function to check an ATA device's id for head unload support as
specified in ATA-7.

Signed-off-by: default avatarElias Oltmanns <eo@nebensachen.de>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent 2ad69677

include/linux/ata.h

+9 −0
Original line number Diff line number Diff line
@@ -667,6 +667,15 @@ static inline int ata_id_has_dword_io(const u16 *id) 
	return 0;

}



static inline int ata_id_has_unload(const u16 *id)

{

	if (ata_id_major_version(id) >= 7 &&

	    (id[ATA_ID_CFSSE] & 0xC000) == 0x4000 &&

	    id[ATA_ID_CFSSE] & (1 << 13))

		return 1;

	return 0;

}



static inline int ata_id_current_chs_valid(const u16 *id)

{

	/* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command