diff options
| author | Hannes Reinecke <hare@suse.de> | 2020-07-28 15:48:33 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-07-30 21:15:26 -0400 |
| commit | bf1a28f92a8b00ee8ce48cc11338980e31ddb7b3 (patch) | |
| tree | ef98675608a7011c683029c79ad8f133a6a5c0e0 | |
| parent | d61fa5bc3e521211d68d00c9199a61a7504b4dab (diff) | |
scsi: scsi_transport_srp: Sanitize scsi_target_block/unblock sequences
The SCSI midlayer does not allow state transitions from SDEV_BLOCK to
SDEV_BLOCK so calling scsi_target_block() from __rport_fast_io_fail() is
wrong as the port is already blocked. Similarly, we don't need to call
scsi_target_unblock() afterwards as the function has already done this.
Link: https://lore.kernel.org/r/20200728134833.42547-1-hare@suse.de
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/scsi_transport_srp.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/scsi/scsi_transport_srp.c b/drivers/scsi/scsi_transport_srp.c index d4d1104fac99..cba1cf6a1c12 100644 --- a/drivers/scsi/scsi_transport_srp.c +++ b/drivers/scsi/scsi_transport_srp.c @@ -395,6 +395,10 @@ static void srp_reconnect_work(struct work_struct *work) } } +/* + * scsi_target_block() must have been called before this function is + * called to guarantee that no .queuecommand() calls are in progress. + */ static void __rport_fail_io_fast(struct srp_rport *rport) { struct Scsi_Host *shost = rport_to_shost(rport); @@ -404,11 +408,7 @@ static void __rport_fail_io_fast(struct srp_rport *rport) if (srp_rport_set_state(rport, SRP_RPORT_FAIL_FAST)) return; - /* - * Call scsi_target_block() to wait for ongoing shost->queuecommand() - * calls before invoking i->f->terminate_rport_io(). - */ - scsi_target_block(rport->dev.parent); + scsi_target_unblock(rport->dev.parent, SDEV_TRANSPORT_OFFLINE); /* Involve the LLD if possible to terminate all I/O on the rport. */ @@ -570,8 +570,6 @@ int srp_reconnect_rport(struct srp_rport *rport) * failure timers if these had not yet been started. */ __rport_fail_io_fast(rport); - scsi_target_unblock(&shost->shost_gendev, - SDEV_TRANSPORT_OFFLINE); __srp_start_tl_fail_timers(rport); } else if (rport->state != SRP_RPORT_BLOCKED) { scsi_target_unblock(&shost->shost_gendev, |