Commit 3655d1d3 authored by Albert Lee's avatar Albert Lee Committed by Jeff Garzik
Browse files

[PATCH] libata: Fix the HSM error_mask mapping (was: Re: libata-tj and SMART) 



Fix the HSM error_mask mapping.

Changes:
- Better mapping in ac_err_mask()
- In HSM_ST_FIRST ans HSM_ST state, check ATA_ERR|ATA_DF and map it to AC_ERR_DEV instead of AC_ERR_HSM.
- In HSM_ST_FIRST and HSM_ST state, map DRQ=1 ERR=1 to AC_ERR_HSM.
- For PIO data in and DRQ=1 ERR=1, add check after the junk data block is read.

Signed-off-by: default avatarAlbert Lee <albertcc@tw.ibm.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 3d71b3b0

drivers/scsi/libata-core.c

+24 −7
Original line number Diff line number Diff line
@@ -4009,9 +4009,15 @@ fsm_start: 
		poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);



		/* check device status */

		if (unlikely((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ)) {

			/* Wrong status. Let EH handle this */

		if (unlikely((status & ATA_DRQ) == 0)) {

			/* handle BSY=0, DRQ=0 as error */

			if (likely(status & (ATA_ERR | ATA_DF)))

				/* device stops HSM for abort/error */

				qc->err_mask |= AC_ERR_DEV;

			else

				/* HSM violation. Let EH handle this */

				qc->err_mask |= AC_ERR_HSM;



			ap->hsm_task_state = HSM_ST_ERR;

			goto fsm_start;

		}
@@ -4025,7 +4031,7 @@ fsm_start: 
		if (unlikely(status & (ATA_ERR | ATA_DF))) {

			printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",

			       ap->id, status);

			qc->err_mask |= AC_ERR_DEV;

			qc->err_mask |= AC_ERR_HSM;

			ap->hsm_task_state = HSM_ST_ERR;

			goto fsm_start;

		}
@@ -4067,7 +4073,9 @@ fsm_start: 
		if (qc->tf.protocol == ATA_PROT_ATAPI) {

			/* ATAPI PIO protocol */

			if ((status & ATA_DRQ) == 0) {

				/* no more data to transfer */

				/* No more data to transfer or device error.

				 * Device error will be tagged in HSM_ST_LAST.

				 */

				ap->hsm_task_state = HSM_ST_LAST;

				goto fsm_start;

			}
@@ -4081,7 +4089,7 @@ fsm_start: 
			if (unlikely(status & (ATA_ERR | ATA_DF))) {

				printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",

				       ap->id, status);

				qc->err_mask |= AC_ERR_DEV;

				qc->err_mask |= AC_ERR_HSM;

				ap->hsm_task_state = HSM_ST_ERR;

				goto fsm_start;

			}
@@ -4096,7 +4104,13 @@ fsm_start: 
			/* ATA PIO protocol */

			if (unlikely((status & ATA_DRQ) == 0)) {

				/* handle BSY=0, DRQ=0 as error */

				if (likely(status & (ATA_ERR | ATA_DF)))

					/* device stops HSM for abort/error */

					qc->err_mask |= AC_ERR_DEV;

				else

					/* HSM violation. Let EH handle this */

					qc->err_mask |= AC_ERR_HSM;



				ap->hsm_task_state = HSM_ST_ERR;

				goto fsm_start;

			}
@@ -4121,6 +4135,9 @@ fsm_start: 
					status = ata_wait_idle(ap);

				}



				if (status & (ATA_BUSY | ATA_DRQ))

					qc->err_mask |= AC_ERR_HSM;



				/* ata_pio_sectors() might change the

				 * state to HSM_ST_LAST. so, the state

				 * is changed after ata_pio_sectors().

include/linux/libata.h

+1 −1
Original line number Diff line number Diff line
@@ -1062,7 +1062,7 @@ static inline int ata_try_flush_cache(const struct ata_device *dev) 


static inline unsigned int ac_err_mask(u8 status)

{

	if (status & ATA_BUSY)

	if (status & (ATA_BUSY | ATA_DRQ))

		return AC_ERR_HSM;

	if (status & (ATA_ERR | ATA_DF))

		return AC_ERR_DEV;

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