Prevent incrementing device->commands_outstanding for
ioaccel command retries that are driver initiated.
If the command goes through the retry path,
the device->commands_outstanding counter has already
accounted for the number of commands outstanding to the device.
Only commands going through function hpsa_cmd_resolve_events
decrement this counter.
* ioaccel commands go to either HBA disks or to logical volumes
comprised of SSDs.
The extra increment is causing device resets to hang.
* Resets wait for all device outstanding commands to complete
before returning.
Replace unused field abort_pending with retry_pending.
This is a maintenance driver so these changes have the
least impact/risk.
Tested-by: Joe Szczypek <jszczype@xxxxxxxxxx>
Reviewed-by: Scott Benesh <scott.benesh@xxxxxxxxxxxxx>
Reviewed-by: Scott Teel <scott.teel@xxxxxxxxxxxxx>
Reviewed-by: Tomas Henzl <thenzl@xxxxxxxxxx>
Signed-off-by: Don Brace <don.brace@xxxxxxxxxxxxx>
---
drivers/scsi/hpsa.c | 51 +++++++++++++++++++++++++++++++++++++++++------
drivers/scsi/hpsa_cmd.h | 2 +-
2 files changed, 45 insertions(+), 8 deletions(-)
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 337d3aa91945..38369766511c 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -1151,7 +1151,10 @@ static void __enqueue_cmd_and_start_io(struct ctlr_info *h,
{
dial_down_lockup_detection_during_fw_flash(h, c);
atomic_inc(&h->commands_outstanding);
- if (c->device)
+ /*
+ * Check to see if the command is being retried.
+ */
+ if (c->device && !c->retry_pending)
atomic_inc(&c->device->commands_outstanding);
reply_queue = h->reply_map[raw_smp_processor_id()];
@@ -5567,7 +5570,8 @@ static inline void hpsa_cmd_partial_init(struct ctlr_info *h, int index,
}
static int hpsa_ioaccel_submit(struct ctlr_info *h,
- struct CommandList *c, struct scsi_cmnd *cmd)
+ struct CommandList *c, struct scsi_cmnd *cmd,
+ bool retry)
{
struct hpsa_scsi_dev_t *dev = cmd->device->hostdata;
int rc = IO_ACCEL_INELIGIBLE;
@@ -5584,18 +5588,22 @@ static int hpsa_ioaccel_submit(struct ctlr_info *h,
cmd->host_scribble = (unsigned char *) c;
if (dev->offload_enabled) {
- hpsa_cmd_init(h, c->cmdindex, c);
+ hpsa_cmd_init(h, c->cmdindex, c); /* Zeroes out all fields */
c->cmd_type = CMD_SCSI;
c->scsi_cmd = cmd;
c->device = dev;
+ if (retry) /* Resubmit but do not increment device->commands_outstanding. */
+ c->retry_pending = true;
rc = hpsa_scsi_ioaccel_raid_map(h, c);
if (rc < 0) /* scsi_dma_map failed. */
rc = SCSI_MLQUEUE_HOST_BUSY;
} else if (dev->hba_ioaccel_enabled) {
- hpsa_cmd_init(h, c->cmdindex, c);
+ hpsa_cmd_init(h, c->cmdindex, c); /* Zeroes out all fields */
c->cmd_type = CMD_SCSI;
c->scsi_cmd = cmd;
c->device = dev;
+ if (retry) /* Resubmit but do not increment device->commands_outstanding. */
+ c->retry_pending = true;
rc = hpsa_scsi_ioaccel_direct_map(h, c);
if (rc < 0) /* scsi_dma_map failed. */
rc = SCSI_MLQUEUE_HOST_BUSY;
@@ -5628,7 +5636,8 @@ static void hpsa_command_resubmit_worker(struct work_struct *work)
if (c2->error_data.serv_response ==
IOACCEL2_STATUS_SR_TASK_COMP_SET_FULL) {
- rc = hpsa_ioaccel_submit(h, c, cmd);
+ /* Resubmit with the retry_pending flag set. */
+ rc = hpsa_ioaccel_submit(h, c, cmd, true);
if (rc == 0)
return;
if (rc == SCSI_MLQUEUE_HOST_BUSY) {
@@ -5644,6 +5653,15 @@ static void hpsa_command_resubmit_worker(struct work_struct *work)
}
}
hpsa_cmd_partial_init(c->h, c->cmdindex, c);
+ /*
+ * Here we have not come in though queue_command, so we
+ * can set the retry_pending flag to true for a driver initiated
+ * retry attempt (I.E. not a SML retry).
+ * I.E. We are submitting a driver initiated retry.
+ * Note: hpsa_ciss_submit does not zero out the command fields like
+ * ioaccel submit does.
+ */
+ c->retry_pending = true;
if (hpsa_ciss_submit(c->h, c, cmd, dev)) {
/*
* If we get here, it means dma mapping failed. Try
@@ -5706,11 +5724,16 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
/*
* Call alternate submit routine for I/O accelerated commands.
* Retries always go down the normal I/O path.
+ * Note: If cmd->retries is non-zero, then this is a SML
+ * initiated retry and not a driver initiated retry.
+ * This command has been obtained from cmd_tagged_alloc
+ * and is therefore a brand-new command.
*/
if (likely(cmd->retries == 0 &&
!blk_rq_is_passthrough(cmd->request) &&
h->acciopath_status)) {
- rc = hpsa_ioaccel_submit(h, c, cmd);
+ /* Submit with the retry_pending flag unset. */
+ rc = hpsa_ioaccel_submit(h, c, cmd, false);
if (rc == 0)
return 0;
if (rc == SCSI_MLQUEUE_HOST_BUSY) {
@@ -6105,6 +6128,7 @@ static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
* at init, and managed by cmd_tagged_alloc() and cmd_tagged_free() using the
* block request tag as an index into a table of entries. cmd_tagged_free() is
* the complement, although cmd_free() may be called instead.
+ * This function is only called for new requests from queue_command.
*/
static struct CommandList *cmd_tagged_alloc(struct ctlr_info *h,
struct scsi_cmnd *scmd)
@@ -6139,8 +6163,14 @@ static struct CommandList *cmd_tagged_alloc(struct ctlr_info *h,
}
atomic_inc(&c->refcount);
-
hpsa_cmd_partial_init(h, idx, c);
+
+ /*
+ * This is a new command obtained from queue_command so
+ * there have not been any driver initiated retry attempts.
+ */
+ c->retry_pending = false;
+
return c;
}
@@ -6208,6 +6238,13 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h)
}
hpsa_cmd_partial_init(h, i, c);
c->device = NULL;
+
+ /*
+ * cmd_alloc is for "internal" commands and they are never
+ * retried.
+ */
+ c->retry_pending = false;
+
return c;
}
diff --git a/drivers/scsi/hpsa_cmd.h b/drivers/scsi/hpsa_cmd.h
index 46df2e3ff89b..d126bb877250 100644
--- a/drivers/scsi/hpsa_cmd.h
+++ b/drivers/scsi/hpsa_cmd.h
@@ -448,7 +448,7 @@ struct CommandList {
*/
struct hpsa_scsi_dev_t *phys_disk;
- int abort_pending;
+ bool retry_pending;
struct hpsa_scsi_dev_t *device;
atomic_t refcount; /* Must be last to avoid memset in hpsa_cmd_init() */
} __aligned(COMMANDLIST_ALIGNMENT);
