linux-sg2042/drivers/scsi/device_handler
Stewart, Sean a8e5a2d593 [SCSI] scsi_dh_alua: ALUA handler attach should succeed while TPG is transitioning
During testing, it was discovered that when a device tries to attach to the
alua handler while in TPG state of transitioning, the alua_rtpg function will
wait for it to exit the state before allowing it to continue. As a result, if
the 60 second timeout expires, the alua handler will not attach to the device.

To fix this, I have introduced an input argument to alua_rtpg called
wait_for_transition.  The idea is that it will wait for the transition to
complete before an activation (because the current TPG state has some bearing
in that case), but during a discovery if it is transitioning, it will not
wait, and will store the state as standby for the time being.

I believe the precedent exists for this from commit
c0d289b3e5 Since if the device reports a state
of transitioning, it can transition to other more valid states, and it has
been established TPGS is supported on the device, if it is attaching.

Signed-off-by: Sean Stewart <Sean.Stewart@netapp.com>
Acked-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2013-10-25 11:19:33 +01:00
..
Kconfig drivers/scsi/device_handler: remove depends on CONFIG_EXPERIMENTAL 2013-01-21 14:52:45 -08:00
Makefile [SCSI] scsi_dh: add generic SPC-3 alua handler 2008-07-26 15:14:52 -04:00
scsi_dh.c [SCSI] scsi_dh: add scsi_dh_attached_handler_name 2012-07-20 08:58:42 +01:00
scsi_dh_alua.c [SCSI] scsi_dh_alua: ALUA handler attach should succeed while TPG is transitioning 2013-10-25 11:19:33 +01:00
scsi_dh_emc.c [SCSI] scsi_dh_emc: Add a match function for emc device handler 2011-12-15 10:55:00 +04:00
scsi_dh_hp_sw.c [SCSI] scsi_dh_hp_sw: Adding the match function for hp_sw device handler 2011-12-15 10:55:00 +04:00
scsi_dh_rdac.c [SCSI] scsi_dh_rdac: Add new IBM 1813 product id to rdac devlist 2013-10-25 09:57:55 +01:00