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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>
This commit is contained in:
Sebastian Andrzej Siewior 2022-02-03 21:29:25 +01:00 committed by Martin K. Petersen
parent 7cddf7e8d1
commit b84b6ec0f9
2 changed files with 20 additions and 2 deletions
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21
drivers/scsi/scsi_lib.c
View File

@ -1625,8 +1625,10 @@ static blk_status_t scsi_prepare_cmd(struct request *req)
return scsi_cmd_to_driver(cmd)->init_command(cmd);
}
void scsi_done(struct scsi_cmnd *cmd)
static void scsi_done_internal(struct scsi_cmnd *cmd, bool complete_directly)
{
struct request *req = scsi_cmd_to_rq(cmd);
switch (cmd->submitter) {
case SUBMITTED_BY_BLOCK_LAYER:
break;
@ -1641,10 +1643,25 @@ void scsi_done(struct scsi_cmnd *cmd)
if (unlikely(test_and_set_bit(SCMD_STATE_COMPLETE, &cmd->state)))
return;
trace_scsi_dispatch_cmd_done(cmd);
blk_mq_complete_request(scsi_cmd_to_rq(cmd));
if (complete_directly)
blk_mq_complete_request_direct(req, scsi_complete);
else
blk_mq_complete_request(req);
}
void scsi_done(struct scsi_cmnd *cmd)
{
scsi_done_internal(cmd, false);
}
EXPORT_SYMBOL(scsi_done);
void scsi_done_direct(struct scsi_cmnd *cmd)
{
scsi_done_internal(cmd, true);
}
EXPORT_SYMBOL(scsi_done_direct);
static void scsi_mq_put_budget(struct request_queue *q, int budget_token)
{
struct scsi_device *sdev = q->queuedata;

1
include/scsi/scsi_cmnd.h
View File

@ -168,6 +168,7 @@ static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
}
void scsi_done(struct scsi_cmnd *cmd);
void scsi_done_direct(struct scsi_cmnd *cmd);
extern void scsi_finish_command(struct scsi_cmnd *cmd);