3.2.95-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Dan Williams <dan.j.williams@xxxxxxxxx>
commit a3a142524aa4b1539a64a55087bf12ffa4b1f94e upstream.
We invoke task->task_done() to free the task in the eh case, but at this
point we are prepared for scsi_eh_flush_done_q() to finish off the scmd.
Introduce sas_end_task() to capture the final response status from the
lldd and free the task.
Also take the opportunity to kill this warning.
drivers/scsi/libsas/sas_scsi_host.c: In function ‘sas_end_task’:
drivers/scsi/libsas/sas_scsi_host.c:102:3: warning: case value ‘2’ not in enumerated type ‘enum exec_status’ [-Wswitch]
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: James Bottomley <JBottomley@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/scsi/libsas/sas_scsi_host.c | 61 ++++++++++++++++++++-----------------
include/scsi/libsas.h | 5 ++-
2 files changed, 37 insertions(+), 29 deletions(-)
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -49,27 +49,12 @@
#include <linux/scatterlist.h>
#include <linux/libata.h>
-/* ---------- SCSI Host glue ---------- */
-
-static void sas_scsi_task_done(struct sas_task *task)
+/* record final status and free the task */
+static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
{
struct task_status_struct *ts = &task->task_status;
- struct scsi_cmnd *sc = task->uldd_task;
int hs = 0, stat = 0;
- if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
- /* Aborted tasks will be completed by the error handler */
- SAS_DPRINTK("task done but aborted\n");
- return;
- }
-
- if (unlikely(!sc)) {
- SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
- list_del_init(&task->list);
- sas_free_task(task);
- return;
- }
-
if (ts->resp == SAS_TASK_UNDELIVERED) {
/* transport error */
hs = DID_NO_CONNECT;
@@ -124,10 +109,32 @@ static void sas_scsi_task_done(struct sa
break;
}
}
- ASSIGN_SAS_TASK(sc, NULL);
+
sc->result = (hs << 16) | stat;
+ ASSIGN_SAS_TASK(sc, NULL);
list_del_init(&task->list);
sas_free_task(task);
+}
+
+static void sas_scsi_task_done(struct sas_task *task)
+{
+ struct scsi_cmnd *sc = task->uldd_task;
+
+ if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
+ /* Aborted tasks will be completed by the error handler */
+ SAS_DPRINTK("task done but aborted\n");
+ return;
+ }
+
+ if (unlikely(!sc)) {
+ SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
+ list_del_init(&task->list);
+ sas_free_task(task);
+ return;
+ }
+
+ ASSIGN_SAS_TASK(sc, NULL);
+ sas_end_task(sc, task);
sc->scsi_done(sc);
}
@@ -238,18 +245,16 @@ static void sas_eh_finish_cmd(struct scs
struct sas_task *task = TO_SAS_TASK(cmd);
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
- /* remove the aborted task flag to allow the task to be
- * completed now. At this point, we only get called following
- * an actual abort of the task, so we should be guaranteed not
- * to be racing with any completions from the LLD (hence we
- * don't need the task state lock to clear the flag) */
- task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
- /* Now call task_done. However, task will be free'd after
- * this */
- task->task_done(task);
+ /* At this point, we only get called following an actual abort
+ * of the task, so we should be guaranteed not to be racing with
+ * any completions from the LLD. Task is freed after this.
+ */
+ sas_end_task(cmd, task);
+
/* now finish the command and move it on to the error
* handler done list, this also takes it off the
- * error handler pending list */
+ * error handler pending list.
+ */
scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
}
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -449,7 +449,10 @@ enum service_response {
};
enum exec_status {
- /* The SAM_STAT_.. codes fit in the lower 6 bits */
+ /* The SAM_STAT_.. codes fit in the lower 6 bits, alias some of
+ * them here to silence 'case value not in enumerated type' warnings
+ */
+ __SAM_STAT_CHECK_CONDITION = SAM_STAT_CHECK_CONDITION,
SAS_DEV_NO_RESPONSE = 0x80,
SAS_DATA_UNDERRUN,