[SCSI] aic94xx: Remove workqueue code from REQ_TASK_ABORT/REQ_DEVICE_RESET code

Now that task aborts and device port resets are done by the EH, we can
remove all the code that set up workqueues and such and simply call
sas_task_abort and let libsas figure things out.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 66 insertions, 56 deletions

diff --git a/drivers/scsi/aic94xx/aic94xx_scb.c b/drivers/scsi/aic94xx/aic94xx_scb.c
index 75ed6b0569d1..8f43ff772f23 100644
--- a/drivers/scsi/aic94xx/aic94xx_scb.c
+++ b/drivers/scsi/aic94xx/aic94xx_scb.c
@@ -413,40 +413,6 @@ void asd_invalidate_edb(struct asd_ascb *ascb, int edb_id)
         }
 }
 
-/* hard reset a phy later */
-static void do_phy_reset_later(struct work_struct *work)
-{
-        struct sas_phy *sas_phy =
-                container_of(work, struct sas_phy, reset_work);
-        int error;
-
-        ASD_DPRINTK("%s: About to hard reset phy %d\n", __FUNCTION__,
-                    sas_phy->identify.phy_identifier);
-        /* Reset device port */
-        error = sas_phy_reset(sas_phy, 1);
-        if (error)
-                ASD_DPRINTK("%s: Hard reset of phy %d failed (%d).\n",
-                            __FUNCTION__, sas_phy->identify.phy_identifier, error);
-}
-
-static void phy_reset_later(struct sas_phy *sas_phy, struct Scsi_Host *shost)
-{
-        INIT_WORK(&sas_phy->reset_work, do_phy_reset_later);
-        queue_work(shost->work_q, &sas_phy->reset_work);
-}
-
-/* start up the ABORT TASK tmf... */
-static void task_kill_later(struct asd_ascb *ascb)
-{
-        struct asd_ha_struct *asd_ha = ascb->ha;
-        struct sas_ha_struct *sas_ha = &asd_ha->sas_ha;
-        struct Scsi_Host *shost = sas_ha->core.shost;
-        struct sas_task *task = ascb->uldd_task;
-
-        INIT_WORK(&task->abort_work, sas_task_abort);
-        queue_work(shost->work_q, &task->abort_work);
-}
-
 static void escb_tasklet_complete(struct asd_ascb *ascb,
                                   struct done_list_struct *dl)
 {
@@ -479,26 +445,55 @@ static void escb_tasklet_complete(struct asd_ascb *ascb,
         case REQ_TASK_ABORT: {
                 struct asd_ascb *a, *b;
                 u16 tc_abort;
+                struct domain_device *failed_dev = NULL;
+
+                ASD_DPRINTK("%s: REQ_TASK_ABORT, reason=0x%X\n",
+                            __FUNCTION__, dl->status_block[3]);
 
+                /*
+                 * Find the task that caused the abort and abort it first.
+                 * The sequencer won't put anything on the done list until
+                 * that happens.
+                 */
                 tc_abort = *((u16*)(&dl->status_block[1]));
                 tc_abort = le16_to_cpu(tc_abort);
 
-                ASD_DPRINTK("%s: REQ_TASK_ABORT, reason=0x%X\n",
-                            __FUNCTION__, dl->status_block[3]);
+                list_for_each_entry_safe(a, b, &asd_ha->seq.pend_q, list) {
+                        struct sas_task *task = ascb->uldd_task;
 
-                /* Find the pending task and abort it. */
-                list_for_each_entry_safe(a, b, &asd_ha->seq.pend_q, list)
-                        if (a->tc_index == tc_abort) {
-                                task_kill_later(a);
+                        if (task && a->tc_index == tc_abort) {
+                                failed_dev = task->dev;
+                                sas_task_abort(task);
                                 break;
                         }
+                }
+
+                if (!failed_dev) {
+                        ASD_DPRINTK("%s: Can't find task (tc=%d) to abort!\n",
+                                    __FUNCTION__, tc_abort);
+                        goto out;
+                }
+
+                /*
+                 * Now abort everything else for that device (hba?) so
+                 * that the EH will wake up and do something.
+                 */
+                list_for_each_entry_safe(a, b, &asd_ha->seq.pend_q, list) {
+                        struct sas_task *task = ascb->uldd_task;
+
+                        if (task &&
+                            task->dev == failed_dev &&
+                            a->tc_index != tc_abort)
+                                sas_task_abort(task);
+                }
+
                 goto out;
         }
         case REQ_DEVICE_RESET: {
-                struct Scsi_Host *shost = sas_ha->core.shost;
-                struct sas_phy *dev_phy;
                 struct asd_ascb *a;
                 u16 conn_handle;
+                unsigned long flags;
+                struct sas_task *last_dev_task = NULL;
 
                 conn_handle = *((u16*)(&dl->status_block[1]));
                 conn_handle = le16_to_cpu(conn_handle);
@@ -506,32 +501,47 @@ static void escb_tasklet_complete(struct asd_ascb *ascb,
                 ASD_DPRINTK("%s: REQ_DEVICE_RESET, reason=0x%X\n", __FUNCTION__,
                             dl->status_block[3]);
 
-                /* Kill all pending tasks and reset the device */
-                dev_phy = NULL;
+                /* Find the last pending task for the device... */
                 list_for_each_entry(a, &asd_ha->seq.pend_q, list) {
-                        struct sas_task *task;
-                        struct domain_device *dev;
                         u16 x;
+                        struct domain_device *dev;
+                        struct sas_task *task = a->uldd_task;
 
-                        task = a->uldd_task;
                         if (!task)
                                 continue;
                         dev = task->dev;
 
                         x = (unsigned long)dev->lldd_dev;
-                        if (x == conn_handle) {
-                                dev_phy = dev->port->phy;
-                                task_kill_later(a);
-                        }
+                        if (x == conn_handle)
+                                last_dev_task = task;
                 }
 
-                /* Reset device port */
-                if (!dev_phy) {
-                        ASD_DPRINTK("%s: No pending commands; can't reset.\n",
-                                    __FUNCTION__);
+                if (!last_dev_task) {
+                        ASD_DPRINTK("%s: Device reset for idle device %d?\n",
+                                    __FUNCTION__, conn_handle);
                         goto out;
                 }
-                phy_reset_later(dev_phy, shost);
+
+                /* ...and set the reset flag */
+                spin_lock_irqsave(&last_dev_task->task_state_lock, flags);
+                last_dev_task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
+                spin_unlock_irqrestore(&last_dev_task->task_state_lock, flags);
+
+                /* Kill all pending tasks for the device */
+                list_for_each_entry(a, &asd_ha->seq.pend_q, list) {
+                        u16 x;
+                        struct domain_device *dev;
+                        struct sas_task *task = a->uldd_task;
+
+                        if (!task)
+                                continue;
+                        dev = task->dev;
+
+                        x = (unsigned long)dev->lldd_dev;
+                        if (x == conn_handle)
+                                sas_task_abort(task);
+                }
+
                 goto out;
         }
         case SIGNAL_NCQ_ERROR: