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linux-stable/drivers/scsi
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Mike Christie e1c6a7ec14 scsi: iscsi: Remove iscsi_get_task back_lock requirement 
We currently require that the back_lock is held when calling the functions
that manipulate the iscsi_task refcount. The only reason for this is to
handle races where we are handling SCSI-ml EH callbacks and the cmd is
completing at the same time the normal completion path is running, and we
can't return from the EH callback until the driver has stopped accessing
the cmd. Holding the back_lock while also accessing the task->state made it
simple to check that a cmd is completing and also get/put a refcount at the
same time, and at the time we were not as concerned about performance.

The problem is that we don't want to take the back_lock from the xmit path
for normal I/O since it causes contention with the completion path if the
user has chosen to try and split those paths on different CPUs (in this
case abusing the CPUs and ignoring caching improves perf for some uses).

Begins to remove the back_lock requirement for iscsi_get/put_task by
removing the requirement for the get path. Instead of always holding the
back_lock we detect if something has done the last put and is about to call
iscsi_free_task(). A subsequent commit will then allow iSCSI code to do the
last put on a task and only grab the back_lock if the refcount is now zero
and it's going to call iscsi_free_task().

Link: https://lore.kernel.org/r/20220616224557.115234-8-michael.christie@oracle.com
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2022-06-21 21:19:23 -04:00
..
aacraid scsi: aacraid: Fix undefined behavior due to shift overflowing the constant 2022-04-25 23:23:05 -04:00
aic7xxx scsi: aic7xxx: Use standard PCI subsystem, subdevice defines 2022-03-30 00:00:59 -04:00
aic94xx scsi: libsas: Introduce struct smp_rps_resp 2022-06-10 13:08:06 -04:00
arcmsr scsi: arcmsr: Switch to attribute groups 2021-10-16 21:45:54 -04:00
arm scsi: arm: Move the SCSI pointer to private command data 2022-02-22 21:11:03 -05:00
be2iscsi scsi: iscsi: Remove iscsi_get_task back_lock requirement 2022-06-21 21:19:23 -04:00
bfa scsi: bfa: Remove unneeded flush_workqueue() 2022-04-25 23:38:38 -04:00
bnx2fc scsi: bnx2fc: Avoid using get_cpu() in bnx2fc_cmd_alloc() 2022-05-16 21:26:50 -04:00
bnx2i scsi: iscsi: Fix session removal on shutdown 2022-06-21 21:14:54 -04:00
csiostor scsi: csio: Stop using the SCSI pointer 2022-02-22 21:11:04 -05:00
cxgbi scsi: iscsi: Rename iscsi_conn_queue_work() 2022-06-21 21:19:22 -04:00
cxlflash scsi: cxlflash: Query write_zeroes limit for zeroing 2022-02-22 21:11:08 -05:00
device_handler scsi: scsi_dh_alua: Properly handle the ALUA transitioning state 2022-05-02 19:52:13 -04:00
dpt treewide: Replace zero-length arrays with flexible-array members 2022-02-17 07:00:39 -06:00
elx scsi: elx: efct: Remove NULL check after calling container_of() 2022-05-19 20:16:27 -04:00
esas2r scsi: esas2r: Fix typo in comment 2022-05-23 23:24:09 -04:00
fcoe SCSI misc on 20220524 2022-05-25 19:09:48 -07:00
fnic scsi: fnic: Replace DMA mask of 64 bits with 47 bits 2022-05-19 20:16:26 -04:00
hisi_sas scsi: hisi_sas: Fix memory ordering in hisi_sas_task_deliver() 2022-05-19 20:16:26 -04:00
ibmvscsi SCSI misc on 20211105 2021-11-05 08:42:02 -07:00
ibmvscsi_tgt scsi: ibmvscsis: Increase INITIAL_SRP_LIMIT to 1024 2022-03-29 23:39:24 -04:00
isci scsi: isci: Fix typo in comment 2022-05-23 23:24:10 -04:00
libfc scsi: libfc: Remove get_cpu() semantics in fc_exch_em_alloc() 2022-05-16 21:26:50 -04:00
libsas scsi: libsas: Introduce struct smp_rps_resp 2022-06-10 13:08:06 -04:00
lpfc scsi: lpfc: Use memset_startat() helper in lpfc_nvmet_xmt_fcp_op_cmp() 2022-06-16 21:23:18 -04:00
megaraid scsi: megaraid_sas: Remove redundant memset() statement 2022-05-19 20:16:26 -04:00
mpi3mr scsi: mpi3mr: Fix kernel-doc 2022-06-01 22:43:26 -04:00
mpt3sas scsi: mpt3sas: Update driver version to 42.100.00.00 2022-05-19 20:16:25 -04:00
mvsas scsi: mvsas: Add PCI ID of RocketRaid 2640 2022-04-06 22:27:08 -04:00
pcmcia scsi: sym53c500_cs: Stop using struct scsi_pointer 2022-04-06 22:11:52 -04:00
pm8001 scsi: pm8001: Expose hardware queues for pm80xx 2022-06-16 21:45:09 -04:00
qedf scsi: qedf: Fix typo in comment 2022-05-23 23:24:10 -04:00
qedi scsi: iscsi: Fix session removal on shutdown 2022-06-21 21:14:54 -04:00
qla2xxx scsi: qla2xxx: Update version to 10.02.07.700-k 2022-06-16 21:59:54 -04:00
qla4xxx scsi: qla4xxx: Drop redundant memset() 2022-04-25 23:33:36 -04:00
smartpqi scsi: smartpqi: Fix typo in comment 2022-05-23 23:24:10 -04:00
snic scsi: snic: Don't use GFP_DMA in snic_queue_report_tgt_req() 2021-12-22 23:43:23 -05:00
sym53c8xx_2 scsi: sym53c8xx_2: Move the SCSI pointer to private command data 2022-02-22 21:11:07 -05:00
.gitignore
3w-9xxx.c scsi: 3w-9xxx: Switch to attribute groups 2021-10-16 21:45:53 -04:00
3w-9xxx.h
3w-sas.c scsi: 3w-sas: Remove useless DMA-32 fallback configuration 2022-01-24 23:30:28 -05:00
3w-sas.h
3w-xxxx.c scsi: 3w-xxx: Remove redundant initialization of variable retval 2021-10-18 22:38:34 -04:00
3w-xxxx.h
53c700.c scsi: 53c700: Stop clearing SCSI pointer fields 2022-02-22 21:11:03 -05:00
53c700.h
53c700.scr
53c700_d.h_shipped
a100u2w.c scsi: a100u2w: Fix a kernel-doc warning 2021-11-29 23:02:13 -05:00
a100u2w.h
a2091.c scsi: wd33c93: Move the SCSI pointer to private command data 2022-02-22 21:11:07 -05:00
a2091.h
a3000.c scsi: wd33c93: Move the SCSI pointer to private command data 2022-02-22 21:11:07 -05:00
a3000.h
a4000t.c
advansys.c scsi: advansys: Move the SCSI pointer to private command data 2022-02-22 21:11:03 -05:00
aha152x.c scsi: aha152x: Stop using struct scsi_pointer 2022-03-29 23:42:18 -04:00
aha152x.h
aha1542.c scsi: aha1542: Remove unneeded semicolon 2022-04-25 23:25:11 -04:00
aha1542.h
aha1740.c scsi: Remove drivers/scsi/scsi.h 2022-02-22 21:11:02 -05:00
aha1740.h
am53c974.c
atari_scsi.c scsi: NCR5380: Add SCp members to struct NCR5380_cmd 2022-02-22 21:11:03 -05:00
atp870u.c scsi: atp870u: Fix a kernel-doc warning 2021-11-29 23:02:13 -05:00
atp870u.h
BusLogic.c scsi: core: Remove the 'done' argument from SCSI queuecommand_lck functions 2021-10-16 21:32:16 -04:00
BusLogic.h
bvme6000_scsi.c
ch.c SCSI misc on 20220113 2022-01-14 14:37:34 +01:00
constants.c
dc395x.c scsi: dc395x: Fix a missing check on list iterator 2022-04-26 08:51:56 -04:00
dc395x.h
dmx3191d.c scsi: NCR5380: Remove the NCR5380_CMD_SIZE macro 2022-02-22 21:11:03 -05:00
dpt_i2o.c scsi: dpt_i2o: Drop redundant spinlock initialization 2022-05-19 20:16:27 -04:00
dpti.h
esp_scsi.c scsi: esp_scsi: Stop using the SCSI pointer 2022-02-22 21:11:04 -05:00
esp_scsi.h scsi: esp_scsi: Stop using the SCSI pointer 2022-02-22 21:11:04 -05:00
fdomain.c scsi: fdomain: Move the SCSI pointer to private command data 2022-02-22 21:11:04 -05:00
fdomain.h
fdomain_isa.c
fdomain_pci.c
FlashPoint.c
g_NCR5380.c scsi: NCR5380: Add SCp members to struct NCR5380_cmd 2022-02-22 21:11:03 -05:00
gvp11.c scsi: wd33c93: Move the SCSI pointer to private command data 2022-02-22 21:11:07 -05:00
gvp11.h
hosts.c scsi: core: iscsi: Directly use ida_alloc()/ida_free() 2022-06-07 21:58:06 -04:00
hpsa.c scsi: hpsa: Remove an unused variable in hpsa_update_scsi_devices() 2021-12-13 23:34:01 -05:00
hpsa.h
hpsa_cmd.h
hptiop.c scsi: hptiop: Stop using the SCSI pointer 2022-02-22 21:11:04 -05:00
hptiop.h scsi: hptiop: Stop using the SCSI pointer 2022-02-22 21:11:04 -05:00
imm.c scsi: imm: Move the SCSI pointer to private command data 2022-02-22 21:11:04 -05:00
imm.h scsi: imm: Move the SCSI pointer to private command data 2022-02-22 21:11:04 -05:00
initio.c scsi: initio: Stop using the SCSI pointer 2022-02-22 21:11:05 -05:00
initio.h scsi: initio: Stop using the SCSI pointer 2022-02-22 21:11:05 -05:00
ipr.c scsi: ipr: Use kobj_to_dev() 2022-05-16 21:32:16 -04:00
ipr.h
ips.c scsi: Remove drivers/scsi/scsi.h 2022-02-22 21:11:02 -05:00
ips.h
iscsi_boot_sysfs.c
iscsi_tcp.c scsi: iscsi_tcp: Drop target_alloc use 2022-06-21 21:19:23 -04:00
iscsi_tcp.h scsi: iscsi: Run recv path from workqueue 2022-06-21 21:19:22 -04:00
jazz_esp.c
Kconfig scsi: ufs: Split the drivers/scsi/ufs directory 2022-05-19 20:27:37 -04:00
lasi700.c parisc: Make struct parisc_driver::remove() return void 2021-08-30 10:18:25 +02:00
libiscsi.c scsi: iscsi: Remove iscsi_get_task back_lock requirement 2022-06-21 21:19:23 -04:00
libiscsi_tcp.c scsi: iscsi: Remove iscsi_get_task back_lock requirement 2022-06-21 21:19:23 -04:00
mac53c94.c scsi: mac53c94: Fix warning comparing pointer to 0 2022-04-25 23:23:05 -04:00
mac53c94.h scsi: mac53c94: Stop using struct scsi_pointer 2022-02-27 21:35:30 -05:00
mac_esp.c
mac_scsi.c scsi: NCR5380: Add SCp members to struct NCR5380_cmd 2022-02-22 21:11:03 -05:00
Makefile scsi: ufs: Split the drivers/scsi/ufs directory 2022-05-19 20:27:37 -04:00
megaraid.c scsi: megaraid: Fix error check return value of register_chrdev() 2022-04-26 09:02:44 -04:00
megaraid.h scsi: megaraid: Stop using the SCSI pointer 2022-02-22 21:11:05 -05:00
mesh.c scsi: mesh: Stop using struct scsi_pointer 2022-02-27 21:34:02 -05:00
mesh.h scsi: mesh: Stop using struct scsi_pointer 2022-02-27 21:34:02 -05:00
mvme16x_scsi.c
mvme147.c scsi: wd33c93: Move the SCSI pointer to private command data 2022-02-22 21:11:07 -05:00
mvme147.h
mvumi.c scsi: mvumi: Stop using the SCSI pointer 2022-02-22 21:11:06 -05:00
mvumi.h scsi: mvumi: Stop using the SCSI pointer 2022-02-22 21:11:06 -05:00
myrb.c scsi: myrb: Fix up null pointer access on myrb_cleanup() 2022-05-23 23:24:10 -04:00
myrb.h
myrs.c scsi: myrs: Fix crash in error case 2022-01-25 00:09:41 -05:00
myrs.h
ncr53c8xx.c scsi: zalon: Stop using the SCSI pointer 2022-02-22 21:11:07 -05:00
ncr53c8xx.h scsi: zalon: Stop using the SCSI pointer 2022-02-22 21:11:07 -05:00
NCR5380.c scsi: NCR5380: Add SCp members to struct NCR5380_cmd 2022-02-22 21:11:03 -05:00
NCR5380.h scsi: NCR5380: Add SCp members to struct NCR5380_cmd 2022-02-22 21:11:03 -05:00
nsp32.c scsi: nsp32: Stop using the SCSI pointer 2022-02-22 21:11:06 -05:00
nsp32.h scsi: nsp32: Stop using the SCSI pointer 2022-02-22 21:11:06 -05:00
nsp32_debug.c
nsp32_io.h
pmcraid.c scsi: pmcraid: Fix typo in comment 2022-05-23 23:24:10 -04:00
pmcraid.h scsi: pmcraid: Remove the PMCRAID_PASSTHROUGH_IOCTL ioctl implementation 2022-03-29 23:32:26 -04:00
ppa.c scsi: ppa: Move the SCSI pointer to private command data 2022-02-22 21:11:06 -05:00
ppa.h
ps3rom.c scsi: core: Remove the 'done' argument from SCSI queuecommand_lck functions 2021-10-16 21:32:16 -04:00
qla1280.c scsi: qla1280: Remove redundant variable 2022-05-19 20:26:21 -04:00
qla1280.h scsi: qla1280: Move the SCSI pointer to private command data 2022-02-22 21:11:06 -05:00
qlogicfas.c scsi: Remove drivers/scsi/scsi.h 2022-02-22 21:11:02 -05:00
qlogicfas408.c scsi: Remove drivers/scsi/scsi.h 2022-02-22 21:11:02 -05:00
qlogicfas408.h
qlogicpti.c scsi: core: Remove the 'done' argument from SCSI queuecommand_lck functions 2021-10-16 21:32:16 -04:00
qlogicpti.h
raid_class.c
script_asm.pl
scsi.c scsi: core: Cache VPD pages b0, b1, b2 2022-05-02 16:59:11 -04:00
scsi_bsg.c scsi: bsg: Drop needless assignment in scsi_bsg_sg_io_fn() 2022-03-15 14:05:02 -04:00
scsi_common.c
scsi_debug.c scsi: scsi_debug: Add gap zone support 2022-04-25 23:23:05 -04:00
scsi_debugfs.c scsi: core: Remove struct scsi_request 2022-03-01 22:21:50 -05:00
scsi_debugfs.h
scsi_devinfo.c
scsi_dh.c
scsi_error.c blk-mq: remove the done argument to blk_execute_rq_nowait 2022-05-28 06:15:27 -06:00
scsi_ioctl.c scsi: scsi_ioctl: Drop needless assignment in sg_io() 2022-03-15 14:07:11 -04:00
scsi_lib.c scsi: core: Return BLK_STS_TRANSPORT for ALUA transitioning 2022-06-01 22:38:53 -04:00
scsi_lib_dma.c
scsi_logging.c scsi: core: scsi_logging: Fix a BUG 2022-03-29 23:29:19 -04:00
scsi_logging.h
scsi_netlink.c
scsi_pm.c scsi: block: pm: Always set request queue runtime active in blk_post_runtime_resume() 2021-12-22 23:38:29 -05:00
scsi_priv.h scsi: Remove superfluous #include <linux/async.h> directives 2021-11-29 23:02:15 -05:00
scsi_proc.c proc: remove PDE_DATA() completely 2022-01-22 08:33:37 +02:00
scsi_sas_internal.h
scsi_scan.c scsi: core: Do not truncate INQUIRY data on modern devices 2022-05-02 16:59:11 -04:00
scsi_sysctl.c
scsi_sysfs.c scsi: core: Unexport scsi_bus_type 2022-05-23 23:24:10 -04:00
scsi_trace.c
scsi_transport_api.h
scsi_transport_fc.c scsi: scsi_transport_fc: Fix FPIN Link Integrity statistics counters 2022-03-01 23:56:27 -05:00
scsi_transport_iscsi.c scsi: iscsi: Add helper to remove a session from the kernel 2022-06-21 21:14:54 -04:00
scsi_transport_sas.c scsi: core: Remove <scsi/scsi_request.h> 2022-03-01 22:21:50 -05:00
scsi_transport_spi.c
scsi_transport_srp.c
scsicam.c scsicam: Fix use of page cache 2022-05-08 14:28:18 -04:00
sd.c SCSI misc on 20220604 2022-06-05 09:25:12 -07:00
sd.h scsi: sd_zbc: Prevent zone information memory leak 2022-06-01 22:36:44 -04:00
sd_dif.c scsi: sd: Reorganize DIF/DIX code to avoid calling revalidate twice 2022-05-02 16:59:11 -04:00
sd_zbc.c scsi: sd_zbc: Prevent zone information memory leak 2022-06-01 22:36:44 -04:00
sense_codes.h
ses.c scsi: ses: Fix unsigned comparison with less than zero 2021-09-28 22:42:06 -04:00
sg.c blk-mq: remove the done argument to blk_execute_rq_nowait 2022-05-28 06:15:27 -06:00
sgiwd93.c scsi: wd33c93: Move the SCSI pointer to private command data 2022-02-22 21:11:07 -05:00
sim710.c
sni_53c710.c
sr.c scsi: sr: Add memory allocation failure handling for get_capabilities() 2022-05-02 16:59:12 -04:00
sr.h sr: implement ->free_disk to simplify refcounting 2022-03-08 19:40:01 -07:00
sr_ioctl.c scsi: sr: Do not leak information in ioctl 2022-04-18 22:48:31 -04:00
sr_vendor.c scsi: sr: Don't use GFP_DMA 2021-12-22 23:41:13 -05:00
st.c blk-mq: remove the done argument to blk_execute_rq_nowait 2022-05-28 06:15:27 -06:00
st.h scsi: don't use disk->private_data to find the scsi_driver 2022-03-08 19:40:00 -07:00
st_options.h
stex.c scsi: core: Remove the 'done' argument from SCSI queuecommand_lck functions 2021-10-16 21:32:16 -04:00
storvsc_drv.c SCSI misc on 20220604 2022-06-05 09:25:12 -07:00
sun3_scsi.c scsi: NCR5380: Add SCp members to struct NCR5380_cmd 2022-02-22 21:11:03 -05:00
sun3_scsi_vme.c
sun3x_esp.c
sun_esp.c
virtio_scsi.c scsi: virtio-scsi: Eliminate anonymous module_init & module_exit 2022-03-29 23:49:56 -04:00
vmw_pvscsi.c scsi: vmw_pvscsi: No need to clear memory after a dma_alloc_coherent() call 2022-04-06 23:01:54 -04:00
vmw_pvscsi.h
wd33c93.c scsi: wd33c93: Move the SCSI pointer to private command data 2022-02-22 21:11:07 -05:00
wd33c93.h scsi: wd33c93: Move the SCSI pointer to private command data 2022-02-22 21:11:07 -05:00
wd719x.c scsi: wd719x: Return proper error code when dma_set_mask() fails 2022-03-01 23:56:28 -05:00
wd719x.h scsi: wd719x: Stop using the SCSI pointer 2022-02-22 21:11:07 -05:00
xen-scsifront.c xen/scsifront: use xenbus_setup_ring() and xenbus_teardown_ring() 2022-05-19 14:22:03 +02:00
zalon.c scsi: zalon: Stop using the SCSI pointer 2022-02-22 21:11:07 -05:00
zorro7xx.c scsi: zorro7xx: Fix a resource leak in zorro7xx_remove_one() 2022-03-30 00:05:42 -04:00
zorro_esp.c