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xen/scsiback: Replace a waitqueue and a counter by a completion

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This patch simplifies the implementation of the scsiback driver
but does not change its behavior.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: David Disseldorp <ddiss@suse.de>
Cc: xen-devel@lists.xenproject.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Bart Van Assche 2017-05-23 16:48:37 -07:00 committed by Nicholas Bellinger
parent 9f4ab18ac5
commit e3eac12442
1 changed files with 4 additions and 7 deletions
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11
drivers/xen/xen-scsiback.c
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@ -135,8 +135,7 @@ struct vscsibk_pend {
struct se_cmd se_cmd;
atomic_t tmr_complete;
wait_queue_head_t tmr_wait;
struct completion tmr_done;
};
#define VSCSI_DEFAULT_SESSION_TAGS 128
@ -600,7 +599,7 @@ static void scsiback_device_action(struct vscsibk_pend *pending_req,
u64 unpacked_lun = pending_req->v2p->lun;
int rc, err = FAILED;
init_waitqueue_head(&pending_req->tmr_wait);
init_completion(&pending_req->tmr_done);
rc = target_submit_tmr(&pending_req->se_cmd, nexus->tvn_se_sess,
&pending_req->sense_buffer[0],
@ -609,8 +608,7 @@ static void scsiback_device_action(struct vscsibk_pend *pending_req,
if (rc)
goto err;
wait_event(pending_req->tmr_wait,
atomic_read(&pending_req->tmr_complete));
wait_for_completion(&pending_req->tmr_done);
err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
SUCCESS : FAILED;
@ -1443,8 +1441,7 @@ static void scsiback_queue_tm_rsp(struct se_cmd *se_cmd)
struct vscsibk_pend *pending_req = container_of(se_cmd,
struct vscsibk_pend, se_cmd);
atomic_set(&pending_req->tmr_complete, 1);
wake_up(&pending_req->tmr_wait);
complete(&pending_req->tmr_done);
}
static void scsiback_aborted_task(struct se_cmd *se_cmd)