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Commit a02227c9 authored by Bartlomiej Zolnierkiewicz's avatar Bartlomiej Zolnierkiewicz
Browse files

ide: lba_capacity_is_ok() -> ata_id_is_lba_capacity_ok() 



Rename lba_capacity_is_ok() to ata_id_is_lba_capacity_ok()
and move it to <linux/ata.h> (remove needless parens while at it).

Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
parent 93734a23

drivers/ide/ide-disk.c

+1 −51
Original line number Diff line number Diff line
@@ -88,56 +88,6 @@ static void ide_disk_put(struct ide_disk_obj *idkp) 
	mutex_unlock(&idedisk_ref_mutex);

}



/*

 * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"

 * value for this drive (from its reported identification information).

 *

 * Returns:	1 if lba_capacity looks sensible

 *		0 otherwise

 *

 * It is called only once for each drive.

 */

static int lba_capacity_is_ok(u16 *id)

{

	unsigned long lba_sects, chs_sects, head, tail;



	/* No non-LBA info .. so valid! */

	if (id[ATA_ID_CYLS] == 0)

		return 1;



	lba_sects = ata_id_u32(id, ATA_ID_LBA_CAPACITY);



	/*

	 * The ATA spec tells large drives to return

	 * C/H/S = 16383/16/63 independent of their size.

	 * Some drives can be jumpered to use 15 heads instead of 16.

	 * Some drives can be jumpered to use 4092 cyls instead of 16383.

	 */

	if ((id[ATA_ID_CYLS] == 16383 ||

	     (id[ATA_ID_CYLS] == 4092 && id[ATA_ID_CUR_CYLS] == 16383)) &&

	    id[ATA_ID_SECTORS] == 63 &&

	    (id[ATA_ID_HEADS] == 15 || id[ATA_ID_HEADS] == 16) &&

	    (lba_sects >= 16383 * 63 * id[ATA_ID_HEADS]))

		return 1;



	chs_sects = id[ATA_ID_CYLS] * id[ATA_ID_HEADS] * id[ATA_ID_SECTORS];



	/* perform a rough sanity check on lba_sects:  within 10% is OK */

	if ((lba_sects - chs_sects) < chs_sects/10)

		return 1;



	/* some drives have the word order reversed */

	head = ((lba_sects >> 16) & 0xffff);

	tail = (lba_sects & 0xffff);

	lba_sects = (head | (tail << 16));

	if ((lba_sects - chs_sects) < chs_sects/10) {

		*(__le32 *)&id[ATA_ID_LBA_CAPACITY] = __cpu_to_le32(lba_sects);

		return 1;	/* lba_capacity is (now) good */

	}



	return 0;	/* lba_capacity value may be bad */

}



static const u8 ide_rw_cmds[] = {

	ATA_CMD_READ_MULTI,

	ATA_CMD_WRITE_MULTI,
@@ -446,7 +396,7 @@ static void init_idedisk_capacity(ide_drive_t *drive) 
		drive->capacity64 = ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);

		if (hpa)

			idedisk_check_hpa(drive);

	} else if (ata_id_has_lba(id) && lba_capacity_is_ok(id)) {

	} else if (ata_id_has_lba(id) && ata_id_is_lba_capacity_ok(id)) {

		/* drive speaks 28-bit LBA */

		drive->select.b.lba = 1;

		drive->capacity64 = ata_id_u32(id, ATA_ID_LBA_CAPACITY);

include/linux/ata.h

+50 −0
Original line number Diff line number Diff line
@@ -782,6 +782,56 @@ static inline int atapi_id_dmadir(const u16 *dev_id) 
	return ata_id_major_version(dev_id) >= 7 && (dev_id[62] & 0x8000);

}



/*

 * ata_id_is_lba_capacity_ok() performs a sanity check on

 * the claimed LBA capacity value for the device.

 *

 * Returns 1 if LBA capacity looks sensible, 0 otherwise.

 *

 * It is called only once for each device.

 */

static inline int ata_id_is_lba_capacity_ok(u16 *id)

{

	unsigned long lba_sects, chs_sects, head, tail;



	/* No non-LBA info .. so valid! */

	if (id[ATA_ID_CYLS] == 0)

		return 1;



	lba_sects = ata_id_u32(id, ATA_ID_LBA_CAPACITY);



	/*

	 * The ATA spec tells large drives to return

	 * C/H/S = 16383/16/63 independent of their size.

	 * Some drives can be jumpered to use 15 heads instead of 16.

	 * Some drives can be jumpered to use 4092 cyls instead of 16383.

	 */

	if ((id[ATA_ID_CYLS] == 16383 ||

	     (id[ATA_ID_CYLS] == 4092 && id[ATA_ID_CUR_CYLS] == 16383)) &&

	    id[ATA_ID_SECTORS] == 63 &&

	    (id[ATA_ID_HEADS] == 15 || id[ATA_ID_HEADS] == 16) &&

	    (lba_sects >= 16383 * 63 * id[ATA_ID_HEADS]))

		return 1;



	chs_sects = id[ATA_ID_CYLS] * id[ATA_ID_HEADS] * id[ATA_ID_SECTORS];



	/* perform a rough sanity check on lba_sects: within 10% is OK */

	if (lba_sects - chs_sects < chs_sects/10)

		return 1;



	/* some drives have the word order reversed */

	head = (lba_sects >> 16) & 0xffff;

	tail = lba_sects & 0xffff;

	lba_sects = head | (tail << 16);



	if (lba_sects - chs_sects < chs_sects/10) {

		*(__le32 *)&id[ATA_ID_LBA_CAPACITY] = __cpu_to_le32(lba_sects);

		return 1;	/* LBA capacity is (now) good */

	}



	return 0;	/* LBA capacity value may be bad */

}



static inline void ata_id_to_hd_driveid(u16 *id)

{

#ifdef __BIG_ENDIAN