From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: David Vrabel <david.vrabel@xxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/xen/xen-scsiback.c | 53 +++++++++++++++++++++++-----------------------
1 file changed, 26 insertions(+), 27 deletions(-)
diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index 640fb22..a10e5f1 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -381,6 +381,12 @@ static void scsiback_cmd_done(struct vscsibk_pend *pending_req)
scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req,
pending_req->rqid);
scsiback_put(info);
+ /*
+ * Drop the extra KREF_ACK reference taken by target_submit_cmd_map_sgls()
+ * ahead of scsiback_check_stop_free() -> transport_generic_free_cmd()
+ * final se_cmd->cmd_kref put.
+ */
+ target_put_sess_cmd(&pending_req->se_cmd);
}
static void scsiback_cmd_exec(struct vscsibk_pend *pending_req)
@@ -398,7 +404,7 @@ static void scsiback_cmd_exec(struct vscsibk_pend *pending_req)
rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd,
pending_req->sense_buffer, pending_req->v2p->lun,
pending_req->data_len, 0,
- pending_req->sc_data_direction, 0,
+ pending_req->sc_data_direction, TARGET_SCF_ACK_KREF,
pending_req->sgl, pending_req->n_sg,
NULL, 0, NULL, 0);
if (rc < 0) {
@@ -587,31 +593,28 @@ static void scsiback_disconnect(struct vscsibk_info *info)
static void scsiback_device_action(struct vscsibk_pend *pending_req,
enum tcm_tmreq_table act, int tag)
{
- int rc, err = FAILED;
struct scsiback_tpg *tpg = pending_req->v2p->tpg;
+ struct scsiback_nexus *nexus = tpg->tpg_nexus;
struct se_cmd *se_cmd = &pending_req->se_cmd;
struct scsiback_tmr *tmr;
+ u64 unpacked_lun = pending_req->v2p->lun;
+ int rc, err = FAILED;
tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL);
- if (!tmr)
- goto out;
+ if (!tmr) {
+ target_put_sess_cmd(se_cmd);
+ goto err;
+ }
init_waitqueue_head(&tmr->tmr_wait);
- transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo,
- tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, TCM_SIMPLE_TAG,
- &pending_req->sense_buffer[0]);
-
- rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL);
- if (rc < 0)
- goto out;
-
- se_cmd->se_tmr_req->ref_task_tag = tag;
+ rc = target_submit_tmr(&pending_req->se_cmd, nexus->tvn_se_sess,
+ &pending_req->sense_buffer[0],
+ unpacked_lun, tmr, act, GFP_KERNEL,
+ tag, TARGET_SCF_ACK_KREF);
+ if (rc)
+ goto err;
- if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0)
- goto out;
-
- transport_generic_handle_tmr(se_cmd);
wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete));
err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
@@ -1368,16 +1371,7 @@ static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg)
static int scsiback_check_stop_free(struct se_cmd *se_cmd)
{
- /*
- * Do not release struct se_cmd's containing a valid TMR pointer.
- * These will be released directly in scsiback_device_action()
- * with transport_generic_free_cmd().
- */
- if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
- return 0;
-
- transport_generic_free_cmd(se_cmd, 0);
- return 1;
+ return transport_generic_free_cmd(se_cmd, 0);
}
static void scsiback_release_cmd(struct se_cmd *se_cmd)
@@ -1385,6 +1379,11 @@ static void scsiback_release_cmd(struct se_cmd *se_cmd)
struct se_session *se_sess = se_cmd->se_sess;
struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
+ if (se_tmr && se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) {
+ struct scsiback_tmr *tmr = se_tmr->fabric_tmr_ptr;
+ kfree(tmr);
+ }
+
percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
}
--
1.9.1
--
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