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authorMike Christie <michael.christie@oracle.com>2021-02-27 10:59:53 -0600
committerMartin K. Petersen <martin.petersen@oracle.com>2021-03-04 17:37:01 -0500
commit1f48b065dad168eebc4f184e97d4aab7a732bd6a (patch)
tree75dacd2a9b36617e5f3461f6dfe7e542648bef56 /drivers/xen/xen-scsiback.c
parenteb929804db7c3525bc302aa043369193edd36542 (diff)
downloadlinux-1f48b065dad168eebc4f184e97d4aab7a732bd6a.tar.bz2
scsi: target: xen-scsiback: Convert to new submission API
target_submit_cmd_map_sgls() is being removed, so convert xen to the new submission API. This has it use target_init_cmd(), target_submit_prep(), or target_submit() because we need to have LIO core map sgls which is now done in target_submit_prep(). target_init_cmd() will never fail for xen because it does its own sync during session shutdown, so we can remove that code. Note: xen never calls target_stop_session() so target_submit_cmd_map_sgls() never failed (in the new API target_init_cmd() handles target_stop_session() being called when cmds are being submitted). If it were to have used target_stop_session() and got an error, we would have hit a refcount bug like xen and usb, because it does: if (rc < 0) { transport_send_check_condition_and_sense(se_cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); transport_generic_free_cmd(se_cmd, 0); } transport_send_check_condition_and_sense() calls queue_status which calls scsiback_cmd_done->target_put_sess_cmd. We do an extra transport_generic_free_cmd() call above which would have dropped the refcount to -1 and the refcount code would spit out errors. Link: https://lore.kernel.org/r/20210227170006.5077-13-michael.christie@oracle.com Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Mike Christie <michael.christie@oracle.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/xen/xen-scsiback.c')
-rw-r--r--drivers/xen/xen-scsiback.c21
1 files changed, 9 insertions, 12 deletions
diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index f3024942fbdf..18b9549f6fa3 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -360,21 +360,18 @@ static void scsiback_cmd_exec(struct vscsibk_pend *pending_req)
{
struct se_cmd *se_cmd = &pending_req->se_cmd;
struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess;
- int rc;
scsiback_get(pending_req->info);
se_cmd->tag = pending_req->rqid;
- 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, TARGET_SCF_ACK_KREF,
- pending_req->sgl, pending_req->n_sg,
- NULL, 0, NULL, 0);
- if (rc < 0) {
- transport_send_check_condition_and_sense(se_cmd,
- TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
- transport_generic_free_cmd(se_cmd, 0);
- }
+ target_init_cmd(se_cmd, sess, pending_req->sense_buffer,
+ pending_req->v2p->lun, pending_req->data_len, 0,
+ pending_req->sc_data_direction, TARGET_SCF_ACK_KREF);
+
+ if (target_submit_prep(se_cmd, pending_req->cmnd, pending_req->sgl,
+ pending_req->n_sg, NULL, 0, NULL, 0))
+ return;
+
+ target_submit(se_cmd);
}
static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map,