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scsi: core: add scsi_host_complete_all_commands() helper 

Add a helper scsi_host_complete_all_commands() to terminate all outstanding
commands on a SCSI host.

Link: https://lore.kernel.org/r/20200228075318.91255-3-hare@suse.de
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Hannes Reinecke 2020-02-28 08:53:07 +01:00 committed by Martin K. Petersen
parent 22f0ba4a28
commit 466552b9f3
2 changed files with 30 additions and 0 deletions
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28
drivers/scsi/hosts.c
View File

@ -650,3 +650,31 @@ void scsi_flush_work(struct Scsi_Host *shost)
flush_workqueue(shost->work_q);
}
EXPORT_SYMBOL_GPL(scsi_flush_work);
static bool complete_all_cmds_iter(struct request *rq, void *data, bool rsvd)
{
struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
int status = *(int *)data;
scsi_dma_unmap(scmd);
scmd->result = status << 16;
scmd->scsi_done(scmd);
return true;
}
/**
* scsi_host_complete_all_commands - Terminate all running commands
* @shost: Scsi Host on which commands should be terminated
* @status: Status to be set for the terminated commands
*
* There is no protection against modification of the number
* of outstanding commands. It is the responsibility of the
* caller to ensure that concurrent I/O submission and/or
* completion is stopped when calling this function.
*/
void scsi_host_complete_all_commands(struct Scsi_Host *shost, int status)
{
blk_mq_tagset_busy_iter(&shost->tag_set, complete_all_cmds_iter,
&status);
}
EXPORT_SYMBOL_GPL(scsi_host_complete_all_commands);

2
include/scsi/scsi_host.h
View File

@ -732,6 +732,8 @@ extern int scsi_host_busy(struct Scsi_Host *shost);
extern void scsi_host_put(struct Scsi_Host *t);
extern struct Scsi_Host *scsi_host_lookup(unsigned short);
extern const char *scsi_host_state_name(enum scsi_host_state);
extern void scsi_host_complete_all_commands(struct Scsi_Host *shost,
int status);
static inline int __must_check scsi_add_host(struct Scsi_Host *host,
struct device *dev)