[PATCH] libata-dev: Minor fix for ata_hsm_move() to work with ata_host_intr()

Minor fix for ata_hsm_move() to work with ata_host_intr().
Changes:
- WARN_ON() and comment fix
- Make the HSM_ST_LAST device status checking more rigid.
- Treat unknown HSM state as BUG().

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 7214530..094c790 100644 (file)
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -3808,6 +3808,8 @@ static void ata_pio_error(struct ata_port *ap)
 static void ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
                         u8 status)
 {
+       WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
+
        /* check error */
        if (unlikely(status & (ATA_ERR | ATA_DF))) {
                qc->err_mask |= AC_ERR_DEV;
@@ -3817,10 +3819,6 @@ static void ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
 fsm_start:
        switch (ap->hsm_task_state) {
        case HSM_ST_FIRST:
-               /* Some pre-ATAPI-4 devices assert INTRQ
-                * at this state when ready to receive CDB.
-                */
-
                /* check device status */
                if (unlikely((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ)) {
                        /* Wrong status. Let EH handle this */
@@ -3873,9 +3871,8 @@ fsm_start:
                break;
 
        case HSM_ST_LAST:
-               if (unlikely(status & ATA_DRQ)) {
-                       /* handle DRQ=1 as error */
-                       qc->err_mask |= AC_ERR_HSM;
+               if (unlikely(!ata_ok(status))) {
+                       qc->err_mask |= __ac_err_mask(status);
                        ap->hsm_task_state = HSM_ST_ERR;
                        goto fsm_start;
                }
@@ -3884,17 +3881,18 @@ fsm_start:
                DPRINTK("ata%u: command complete, drv_stat 0x%x\n",
                        ap->id, status);
 
+               WARN_ON(qc->err_mask);
+
                ap->hsm_task_state = HSM_ST_IDLE;
 
                /* complete taskfile transaction */
-               qc->err_mask |= ac_err_mask(status);
                ata_qc_complete(qc);
                break;
 
        case HSM_ST_ERR:
                if (qc->tf.command != ATA_CMD_PACKET)
-                       printk(KERN_ERR "ata%u: command error, drv_stat 0x%x host_stat 0x%x\n",
-                              ap->id, status, host_stat);
+                       printk(KERN_ERR "ata%u: command error, drv_stat 0x%x\n",
+                              ap->id, status);
 
                /* make sure qc->err_mask is available to
                 * know what's wrong and recover
@@ -3905,7 +3903,7 @@ fsm_start:
                ata_qc_complete(qc);
                break;
        default:
-               goto idle_irq;
+               BUG();
        }
 
 }
@@ -4371,6 +4369,10 @@ inline unsigned int ata_host_intr (struct ata_port *ap,
        /* Check whether we are expecting interrupt in this state */
        switch (ap->hsm_task_state) {
        case HSM_ST_FIRST:
+               /* Some pre-ATAPI-4 devices assert INTRQ
+                * at this state when ready to receive CDB.
+                */
+
                /* Check the ATA_DFLAG_CDB_INTR flag is enough here.
                 * The flag was turned on only for atapi devices.
                 * No need to check is_atapi_taskfile(&qc->tf) again.