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scsi: core: Also call destroy_rcu_head() for passthrough requests 

cmd->rcu is initialized by scsi_initialize_rq(). For passthrough
requests, blk_get_request() calls scsi_initialize_rq(). For filesystem
requests, scsi_init_command() calls scsi_initialize_rq(). Make sure
that destroy_rcu_head() is called for passthrough requests.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Ewan D. Milne <emilne@redhat.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Reported-by: Ewan D. Milne <emilne@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2019-03-18 09:29:26 -07:00 committed by Martin K. Petersen
parent 165aa2bfb4
commit db983f6eef
1 changed files with 8 additions and 1 deletions
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9
drivers/scsi/scsi_lib.c
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@ -585,9 +585,16 @@ static bool scsi_end_request(struct request *req, blk_status_t error,
if (!blk_rq_is_scsi(req)) {
WARN_ON_ONCE(!(cmd->flags & SCMD_INITIALIZED));
cmd->flags &= ~SCMD_INITIALIZED;
destroy_rcu_head(&cmd->rcu);
}
/*
* Calling rcu_barrier() is not necessary here because the
* SCSI error handler guarantees that the function called by
* call_rcu() has been called before scsi_end_request() is
* called.
*/
destroy_rcu_head(&cmd->rcu);
/*
* In the MQ case the command gets freed by __blk_mq_end_request,
* so we have to do all cleanup that depends on it earlier.