Disallow the SDEV_TRANSPORT_OFFLINE to SDEV_CANCEL transition such
that no I/O is sent to devices for which the transport is offline.
Notes:
- Functions like sd_shutdown() use scsi_execute_req() and hence
set the REQ_PREEMPT flag. Such requests are passed to the LLD
queuecommand callback in the SDEV_CANCEL state.
- This patch does not affect Fibre Channel LLD drivers since these
drivers invoke fc_remote_port_chkready() before submitting a SCSI
request to the HBA. That prevents a timeout to occur in state
SDEV_CANCEL if the transport is offline.
Signed-off-by: Bart Van Assche <bvanass...@acm.org>
Reviewed-by: Mike Christie <micha...@cs.wisc.edu>
Cc: James Bottomley <jbottom...@parallels.com>
Cc: Hannes Reinecke <h...@suse.de>
Cc: Tejun Heo <t...@kernel.org>
---
drivers/scsi/scsi_lib.c | 1 -
drivers/scsi/scsi_sysfs.c | 3 ++-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 10c054f..024e768 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2162,7 +2162,6 @@ scsi_device_set_state(struct scsi_device *sdev, enum
scsi_device_state state)
case SDEV_RUNNING:
case SDEV_QUIESCE:
case SDEV_OFFLINE:
- case SDEV_TRANSPORT_OFFLINE:
case SDEV_BLOCK:
break;
default:
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 11318cc..dd2005c 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -963,7 +963,8 @@ void __scsi_remove_device(struct scsi_device *sdev)
if (sdev->is_visible) {
spin_lock_irqsave(shost->host_lock, flags);
- WARN(scsi_device_set_state(sdev, SDEV_CANCEL) != 0,
+ WARN(scsi_device_set_state(sdev, SDEV_CANCEL) != 0 &&
+ sdev->sdev_state != SDEV_TRANSPORT_OFFLINE,
"%s: unexpected state %d\n", dev_name(&sdev->sdev_gendev),
sdev->sdev_state);
spin_unlock_irqrestore(shost->host_lock, flags);
--
1.7.10.4
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