[PATCH v3 08/11] scsi: scsi_debug: Use blk_mq_tagset_busy_iter() in stop_all_queued()

John Garry
2023-03-27T07:44:08Z

Instead of iterating all deferred commands in the submission queue
structures, use blk_mq_tagset_busy_iter(), which is a standard API for
this.

Signed-off-by: John Garry <john.g.garry@oracle.com>
---
drivers/scsi/scsi_debug.c | 45 +++++++++++++++------------------------
1 file changed, 17 insertions(+), 28 deletions(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 3330848f13cc..677fb177ccd3 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -5326,40 +5326,29 @@ static bool scsi_debug_abort_cmnd(struct scsi_cmnd *cmnd)
return res;
}

+/*
+ * All we can do is set the cmnd as internally aborted and wait for it to
+ * finish. We cannot call scsi_done() as normal completion path may do that.
+ */
+static bool sdebug_stop_cmnd(struct request *rq, void *data)
+{
+ scsi_debug_abort_cmnd(blk_mq_rq_to_pdu(rq));
+
+ return true;
+}
+
/* Deletes (stops) timers or work queues of all queued commands */
static void stop_all_queued(void)
{
- unsigned long iflags, flags;
- int j, k;
- struct sdebug_queue *sqp;
+ struct sdebug_host_info *sdhp;

- for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) {
- spin_lock_irqsave(&sqp->qc_lock, iflags);
- for (k = 0; k < SDEBUG_CANQUEUE; ++k) {
- if (test_bit(k, sqp->in_use_bm)) {
- struct sdebug_queued_cmd *sqcp = sqp->qc_arr[k];
- struct sdebug_scsi_cmd *sdsc;
- struct scsi_cmnd *scmd;
+ mutex_lock(&sdebug_host_list_mutex);
+ list_for_each_entry(sdhp, &sdebug_host_list, host_list) {
+ struct Scsi_Host *shost = sdhp->shost;

- if (!sqcp)
- continue;
- scmd = sqcp->scmd;
- if (!scmd)
- continue;
- sdsc = scsi_cmd_priv(scmd);
- spin_lock_irqsave(&sdsc->lock, flags);
- if (TO_QEUEUED_CMD(scmd) != sqcp) {
- spin_unlock_irqrestore(&sdsc->lock, flags);
- continue;
- }
- scsi_debug_stop_cmnd(scmd, NULL);
- spin_unlock_irqrestore(&sdsc->lock, flags);
- sqp->qc_arr[k] = NULL;
- clear_bit(k, sqp->in_use_bm);
- }
- }
- spin_unlock_irqrestore(&sqp->qc_lock, iflags);
+ blk_mq_tagset_busy_iter(&shost->tag_set, sdebug_stop_cmnd, NULL);
}
+ mutex_unlock(&sdebug_host_list_mutex);
}

static int scsi_debug_abort(struct scsi_cmnd *SCpnt)
--
2.35.3