1 files changed, 86 insertions, 4 deletions

diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index e46e793..e064aac 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -29,9 +29,11 @@
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_tcq.h>
 #include <scsi/scsi.h>
+#include <scsi/scsi_eh.h>
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_transport_sas.h>
 #include "../scsi_sas_internal.h"
+#include "../scsi_transport_api.h"
 
 #include <linux/err.h>
 #include <linux/blkdev.h>
@@ -46,6 +48,7 @@ static void sas_scsi_task_done(struct sas_task *task)
 {
 	struct task_status_struct *ts = &task->task_status;
 	struct scsi_cmnd *sc = task->uldd_task;
+	struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host);
 	unsigned ts_flags = task->task_state_flags;
 	int hs = 0, stat = 0;
 
@@ -116,7 +119,7 @@ static void sas_scsi_task_done(struct sas_task *task)
 	sas_free_task(task);
 	/* This is very ugly but this is how SCSI Core works. */
 	if (ts_flags & SAS_TASK_STATE_ABORTED)
-		scsi_finish_command(sc);
+		scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q);
 	else
 		sc->scsi_done(sc);
 }
@@ -307,6 +310,15 @@ static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 		spin_unlock_irqrestore(&core->task_queue_lock, flags);
 	}
 
+	spin_lock_irqsave(&task->task_state_lock, flags);
+	if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) {
+		spin_unlock_irqrestore(&task->task_state_lock, flags);
+		SAS_DPRINTK("%s: task 0x%p already aborted\n",
+			    __FUNCTION__, task);
+		return TASK_IS_ABORTED;
+	}
+	spin_unlock_irqrestore(&task->task_state_lock, flags);
+
 	for (i = 0; i < 5; i++) {
 		SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 		res = si->dft->lldd_abort_task(task);
@@ -409,13 +421,16 @@ Again:
 	SAS_DPRINTK("going over list...\n");
 	list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
 		struct sas_task *task = TO_SAS_TASK(cmd);
+		list_del_init(&cmd->eh_entry);
 
+		if (!task) {
+			SAS_DPRINTK("%s: taskless cmd?!\n", __FUNCTION__);
+			continue;
+		}
 		SAS_DPRINTK("trying to find task 0x%p\n", task);
-		list_del_init(&cmd->eh_entry);
 		res = sas_scsi_find_task(task);
 
 		cmd->eh_eflags = 0;
-		shost->host_failed--;
 
 		switch (res) {
 		case TASK_IS_DONE:
@@ -491,6 +506,7 @@ Again:
 		}
 	}
 out:
+	scsi_eh_flush_done_q(&ha->eh_done_q);
 	SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 	return;
 clear_q:
@@ -508,12 +524,18 @@ enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 	unsigned long flags;
 
 	if (!task) {
-		SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
+		SAS_DPRINTK("command 0x%p, task 0x%p, gone: EH_HANDLED\n",
 			    cmd, task);
 		return EH_HANDLED;
 	}
 
 	spin_lock_irqsave(&task->task_state_lock, flags);
+	if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) {
+		spin_unlock_irqrestore(&task->task_state_lock, flags);
+		SAS_DPRINTK("command 0x%p, task 0x%p, aborted by initiator: "
+			    "EH_NOT_HANDLED\n", cmd, task);
+		return EH_NOT_HANDLED;
+	}
 	if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 		spin_unlock_irqrestore(&task->task_state_lock, flags);
 		SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
@@ -777,6 +799,64 @@ void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 	spin_unlock_irqrestore(&core->task_queue_lock, flags);
 }
 
+static int do_sas_task_abort(struct sas_task *task)
+{
+	struct scsi_cmnd *sc = task->uldd_task;
+	struct sas_internal *si =
+		to_sas_internal(task->dev->port->ha->core.shost->transportt);
+	unsigned long flags;
+	int res;
+
+	spin_lock_irqsave(&task->task_state_lock, flags);
+	if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
+		spin_unlock_irqrestore(&task->task_state_lock, flags);
+		SAS_DPRINTK("%s: Task %p already aborted.\n", __FUNCTION__,
+			    task);
+		return 0;
+	}
+
+	task->task_state_flags |= SAS_TASK_INITIATOR_ABORTED;
+	if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
+		task->task_state_flags |= SAS_TASK_STATE_ABORTED;
+	spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+	if (!si->dft->lldd_abort_task)
+		return -ENODEV;
+
+	res = si->dft->lldd_abort_task(task);
+	if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
+	    (res == TMF_RESP_FUNC_COMPLETE))
+	{
+		/* SMP commands don't have scsi_cmds(?) */
+		if (!sc) {
+			task->task_done(task);
+			return 0;
+		}
+		scsi_req_abort_cmd(sc);
+		scsi_schedule_eh(sc->device->host);
+		return 0;
+	}
+
+	spin_lock_irqsave(&task->task_state_lock, flags);
+	task->task_state_flags &= ~SAS_TASK_INITIATOR_ABORTED;
+	if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
+		task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
+	spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+	return -EAGAIN;
+}
+
+void sas_task_abort(struct sas_task *task)
+{
+	int i;
+
+	for (i = 0; i < 5; i++)
+		if (!do_sas_task_abort(task))
+			return;
+
+	SAS_DPRINTK("%s: Could not kill task!\n", __FUNCTION__);
+}
+
 EXPORT_SYMBOL_GPL(sas_queuecommand);
 EXPORT_SYMBOL_GPL(sas_target_alloc);
 EXPORT_SYMBOL_GPL(sas_slave_configure);
@@ -784,3 +864,5 @@ EXPORT_SYMBOL_GPL(sas_slave_destroy);
 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
 EXPORT_SYMBOL_GPL(sas_change_queue_type);
 EXPORT_SYMBOL_GPL(sas_bios_param);
+EXPORT_SYMBOL_GPL(sas_task_abort);
+EXPORT_SYMBOL_GPL(sas_phy_reset);