linux/drivers/target
Bodo Stroesser f2e6b75f6e scsi: target: Put lun_ref at end of tmr processing
Testing with Loopback I found that, after a Loopback LUN has executed a
TMR, I can no longer unlink the LUN.  The rm command hangs in
transport_clear_lun_ref() at wait_for_completion(&lun->lun_shutdown_comp)
The reason is, that transport_lun_remove_cmd() is not called at the end of
target_tmr_work().

It seems, that in other fabrics this call happens implicitly when the
fabric drivers call transport_generic_free_cmd() during their
->queue_tm_rsp().

Unfortunately Loopback seems to not comply to the common way
of calling transport_generic_free_cmd() from ->queue_*().
Instead it calls transport_generic_free_cmd() from its
  ->check_stop_free() only.

But the ->check_stop_free() is called by
transport_cmd_check_stop_to_fabric() after it has reset the se_cmd->se_lun
pointer.  Therefore the following transport_generic_free_cmd() skips the
transport_lun_remove_cmd().

So this patch re-adds the transport_lun_remove_cmd() at the end of
target_tmr_work(), which was removed during commit 2c9fa49e10 ("scsi:
target/core: Make ABORT and LUN RESET handling synchronous").

For fabrics using transport_generic_free_cmd() in the usual way the double
call to transport_lun_remove_cmd() doesn't harm, as
transport_lun_remove_cmd() checks for this situation and does not release
lun_ref twice.

Link: https://lore.kernel.org/r/20200513153443.3554-1-bstroesser@ts.fujitsu.com
Fixes: 2c9fa49e10 ("scsi: target/core: Make ABORT and LUN RESET handling synchronous")
Cc: stable@vger.kernel.org
Tested-by: Bryant G. Ly <bryangly@gmail.com>
Reviewed-by: Bart van Assche <bvanassche@acm.org>
Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2020-05-14 20:27:05 -04:00
..
iscsi SCSI misc on 20200402 2020-04-02 17:03:53 -07:00
loopback treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
sbp treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
tcm_fc scsi: libfc: remove unnecessary assertion on ep variable 2019-12-19 22:08:55 -05:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile
target_core_alua.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
target_core_alua.h
target_core_configfs.c scsi: target: use an enum to track emulate_ua_intlck_ctrl 2020-02-21 17:37:16 -05:00
target_core_device.c scsi: target: use an enum to track emulate_ua_intlck_ctrl 2020-02-21 17:37:16 -05:00
target_core_fabric_configfs.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
target_core_fabric_lib.c scsi: target: fix PR IN / READ FULL STATUS for FC 2020-04-13 14:00:41 -04:00
target_core_file.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
target_core_file.h
target_core_hba.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
target_core_iblock.c scsi: target/iblock: fix WRITE SAME zeroing 2020-04-22 00:02:13 -04:00
target_core_iblock.h
target_core_internal.h
target_core_pr.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
target_core_pr.h scsi: target/core: Rework the SPC-2 reservation handling code 2019-04-12 20:20:05 -04:00
target_core_pscsi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
target_core_pscsi.h
target_core_rd.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
target_core_rd.h
target_core_sbc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
target_core_spc.c scsi: target: use an enum to track emulate_ua_intlck_ctrl 2020-02-21 17:37:16 -05:00
target_core_stat.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
target_core_tmr.c scsi: target: convert boolean se_dev_attrib types to bool 2020-02-21 17:37:14 -05:00
target_core_tpg.c scsi: target: Remove tpg_list and se_portal_group.se_tpg_node 2019-10-03 22:00:09 -04:00
target_core_transport.c scsi: target: Put lun_ref at end of tmr processing 2020-05-14 20:27:05 -04:00
target_core_ua.c scsi: target: use an enum to track emulate_ua_intlck_ctrl 2020-02-21 17:37:16 -05:00
target_core_ua.h
target_core_user.c scsi: target: tcmu: reset_ring should reset TCMU_DEV_BIT_BROKEN 2020-04-13 14:03:20 -04:00
target_core_xcopy.c scsi: target: use the stack for XCOPY passthrough cmds 2020-03-29 18:10:59 -04:00
target_core_xcopy.h scsi: target: use the stack for XCOPY passthrough cmds 2020-03-29 18:10:59 -04:00