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scsi: core: Add scsi_done_direct() for immediate completion
Add scsi_done_direct() which behaves like scsi_done() except that it invokes blk_mq_complete_request_direct() in order to complete the request. Callers from process context can complete the request directly instead waking ksoftirqd. Link: https://lore.kernel.org/r/Yfw7JaszshmfYa1d@flow Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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2 changed files with 20 additions and 2 deletions
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@ -1625,8 +1625,10 @@ static blk_status_t scsi_prepare_cmd(struct request *req)
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return scsi_cmd_to_driver(cmd)->init_command(cmd);
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}
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void scsi_done(struct scsi_cmnd *cmd)
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static void scsi_done_internal(struct scsi_cmnd *cmd, bool complete_directly)
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{
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struct request *req = scsi_cmd_to_rq(cmd);
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switch (cmd->submitter) {
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case SUBMITTED_BY_BLOCK_LAYER:
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break;
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@ -1641,10 +1643,25 @@ void scsi_done(struct scsi_cmnd *cmd)
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if (unlikely(test_and_set_bit(SCMD_STATE_COMPLETE, &cmd->state)))
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return;
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trace_scsi_dispatch_cmd_done(cmd);
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blk_mq_complete_request(scsi_cmd_to_rq(cmd));
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if (complete_directly)
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blk_mq_complete_request_direct(req, scsi_complete);
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else
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blk_mq_complete_request(req);
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}
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void scsi_done(struct scsi_cmnd *cmd)
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{
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scsi_done_internal(cmd, false);
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}
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EXPORT_SYMBOL(scsi_done);
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void scsi_done_direct(struct scsi_cmnd *cmd)
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{
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scsi_done_internal(cmd, true);
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}
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EXPORT_SYMBOL(scsi_done_direct);
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static void scsi_mq_put_budget(struct request_queue *q, int budget_token)
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{
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struct scsi_device *sdev = q->queuedata;
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@ -168,6 +168,7 @@ static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
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}
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void scsi_done(struct scsi_cmnd *cmd);
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void scsi_done_direct(struct scsi_cmnd *cmd);
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extern void scsi_finish_command(struct scsi_cmnd *cmd);
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