[SCSI] sas_ata: ata_post_internal should abort the sas_task
This patch adds a new field, lldd_task, to ata_queued_cmd so that libata
users such as libsas can associate some data with a qc. The particular
ambition with this patch is to associate a sas_task with a qc; that way,
if libata decides to timeout a command, we can come back (in
sas_ata_post_internal) and abort the sas task.
One question remains: Is it necessary to reset the phy on error, or will
the libata error handler take care of it? (Assuming that one is written,
of course.) This patch, as it is today, works well enough to clean
things up when an ATA device probe attempt fails halfway through the probe,
though I'm not sure this is always the right thing to do.
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 46e1dbe..c8af884 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -88,12 +88,17 @@
static void sas_ata_task_done(struct sas_task *task)
{
struct ata_queued_cmd *qc = task->uldd_task;
- struct domain_device *dev = qc->ap->private_data;
+ struct domain_device *dev;
struct task_status_struct *stat = &task->task_status;
struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
enum ata_completion_errors ac;
unsigned long flags;
+ if (!qc)
+ goto qc_already_gone;
+
+ dev = qc->ap->private_data;
+
spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
if (stat->stat == SAS_PROTO_RESPONSE) {
ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
@@ -114,9 +119,11 @@
}
}
+ qc->lldd_task = NULL;
ata_qc_complete(qc);
spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
+qc_already_gone:
list_del_init(&task->list);
sas_free_task(task);
}
@@ -166,6 +173,7 @@
task->scatter = qc->__sg;
task->ata_task.retry_count = 1;
task->task_state_flags = SAS_TASK_STATE_PENDING;
+ qc->lldd_task = task;
switch (qc->tf.protocol) {
case ATA_PROT_NCQ:
@@ -237,8 +245,24 @@
if (qc->flags & ATA_QCFLAG_FAILED)
qc->err_mask |= AC_ERR_OTHER;
- if (qc->err_mask)
- SAS_DPRINTK("%s: Failure; reset phy!\n", __FUNCTION__);
+ if (qc->err_mask) {
+ /*
+ * Find the sas_task and kill it. By this point,
+ * libata has decided to kill the qc, so we needn't
+ * bother with sas_ata_task_done. But we still
+ * ought to abort the task.
+ */
+ struct sas_task *task = qc->lldd_task;
+ struct domain_device *dev = qc->ap->private_data;
+
+ qc->lldd_task = NULL;
+ if (task) {
+ task->uldd_task = NULL;
+ __sas_task_abort(task);
+ }
+
+ sas_phy_reset(dev->port->phy, 1);
+ }
}
static void sas_ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)