linux-stable.git/drivers/scsi/device_handler, branch v5.13.2

scsi: core: Introduce enum scsi_disposition

2021-04-16T02:44:40+00:00

Improve readability of the code in the SCSI core by introducing an
enumeration type for the values used internally that decide how to continue
processing a SCSI command. The eh_*_handler return values have not been
changed because that would involve modifying all SCSI drivers.

The output of the following command has been inspected to verify that no
out-of-range values are assigned to a variable of type enum
scsi_disposition:

KCFLAGS=-Wassign-enum make CC=clang W=1 drivers/scsi/

Link: https://lore.kernel.org/r/20210415220826.29438-6-bvanassche@acm.org
Cc: Christoph Hellwig 
Cc: Johannes Thumshirn 
Cc: Hannes Reinecke 
Cc: Daniel Wagner 
Signed-off-by: Bart Van Assche 
Signed-off-by: Martin K. Petersen

scsi: scsi_dh_alua: Remove check for ASC 24h in alua_rtpg()

2021-04-06T03:24:18+00:00

Some arrays return ILLEGAL_REQUEST with ASC 00h if they don't support the
RTPG extended header so remove the check for INVALID FIELD IN CDB.

Link: https://lore.kernel.org/r/20210331201154.20348-1-emilne@redhat.com
Reviewed-by: Hannes Reinecke 
Signed-off-by: Ewan D. Milne 
Signed-off-by: Martin K. Petersen

scsi: scsi_dh_alua: Prevent duplicate pg info print in alua_rtpg()

2021-04-06T03:20:38+00:00

Due to the frequency that alua_rtpg() is called, the path group info print
within can print the same info multiple times in the logs, subsequent
prints adding no new information or value.

To reproduce:

    # modprobe scsi_debug vpd_use_hostno=0
    # systemctl start multipathd.service

To fix, check stored values, only printing at alua attach/activate and if
any of the values change.

Link: https://lore.kernel.org/r/20210331181656.5046-1-jpittman@redhat.com
Reviewed-by: David Jeffery 
Reviewed-by: Laurence Oberman 
Signed-off-by: John Pittman 
Signed-off-by: Martin K. Petersen

Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

2020-12-16T21:34:31+00:00

Pull SCSI updates from James Bottomley:
 "This consists of the usual driver updates (ufs, qla2xxx, smartpqi,
  target, zfcp, fnic, mpt3sas, ibmvfc) plus a load of cleanups, a major
  power management rework and a load of assorted minor updates.

  There are a few core updates (formatting fixes being the big one) but
  nothing major this cycle"

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (279 commits)
  scsi: mpt3sas: Update driver version to 36.100.00.00
  scsi: mpt3sas: Handle trigger page after firmware update
  scsi: mpt3sas: Add persistent MPI trigger page
  scsi: mpt3sas: Add persistent SCSI sense trigger page
  scsi: mpt3sas: Add persistent Event trigger page
  scsi: mpt3sas: Add persistent Master trigger page
  scsi: mpt3sas: Add persistent trigger pages support
  scsi: mpt3sas: Sync time periodically between driver and firmware
  scsi: qla2xxx: Update version to 10.02.00.104-k
  scsi: qla2xxx: Fix device loss on 4G and older HBAs
  scsi: qla2xxx: If fcport is undergoing deletion complete I/O with retry
  scsi: qla2xxx: Fix the call trace for flush workqueue
  scsi: qla2xxx: Fix flash update in 28XX adapters on big endian machines
  scsi: qla2xxx: Handle aborts correctly for port undergoing deletion
  scsi: qla2xxx: Fix N2N and NVMe connect retry failure
  scsi: qla2xxx: Fix FW initialization error on big endian machines
  scsi: qla2xxx: Fix crash during driver load on big endian machines
  scsi: qla2xxx: Fix compilation issue in PPC systems
  scsi: qla2xxx: Don't check for fw_started while posting NVMe command
  scsi: qla2xxx: Tear down session if FW say it is down
  ...

scsi: scsi_dh_alua: Set 'transitioning' state on Unit Attention

2020-11-11T03:58:12+00:00

We should be setting the 'transitioning' ALUA state once we get a Unit
Attention indicating the array is in transitioning.  There are arrays which
cannot respond to an RTPG while in transitioning, and others have issues
correctly reporting the state.  So better to set the state during Unit
Attention handling and wait for TUR / RTPG to run its course.

Link: https://lore.kernel.org/r/20200930080256.90964-4-hare@suse.de
Reviewed-by: Ewan D. Milne 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen

scsi: scsi_dh_alua: Return BLK_STS_AGAIN for ALUA transitioning state

2020-11-11T03:58:12+00:00

When the ALUA state indicates transitioning we should not retry the command
immediately, but rather complete the command with BLK_STS_AGAIN to signal
the completion handler that it might be retried.  This allows multipathing
to redirect the command to another path if possible, and avoid stalls
during lengthy transitioning times.

Link: https://lore.kernel.org/r/20200930080256.90964-3-hare@suse.de
Reviewed-by: Ewan D. Milne 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen

scsi: scsi_dh_alua: Avoid crash during alua_bus_detach()

2020-11-02T23:09:49+00:00

alua_bus_detach() might be running concurrently with alua_rtpg_work(), so
we might trip over h->sdev == NULL and call BUG_ON().  The correct way of
handling it is to not set h->sdev to NULL in alua_bus_detach(), and call
rcu_synchronize() before the final delete to ensure that all concurrent
threads have left the critical section.  Then we can get rid of the
BUG_ON() and replace it with a simple if condition.

Link: https://lore.kernel.org/r/1600167537-12509-1-git-send-email-jitendra.khasdev@oracle.com
Link: https://lore.kernel.org/r/20200924104559.26753-1-hare@suse.de
Cc: Brian Bunker 
Acked-by: Brian Bunker 
Tested-by: Jitendra Khasdev 
Reviewed-by: Jitendra Khasdev 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen

treewide: Use fallthrough pseudo-keyword

2020-08-23T22:36:59+00:00

Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva

Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

2019-10-26T00:11:33+00:00

Pull SCSI fixes from James Bottomley:
 "Nine changes, eight to drivers (qla2xxx, hpsa, lpfc, alua, ch,
  53c710[x2], target) and one core change that tries to close a race
  between sysfs delete and module removal"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: lpfc: remove left-over BUILD_NVME defines
  scsi: core: try to get module before removing device
  scsi: hpsa: add missing hunks in reset-patch
  scsi: target: core: Do not overwrite CDB byte 1
  scsi: ch: Make it possible to open a ch device multiple times again
  scsi: fix kconfig dependency warning related to 53C700_LE_ON_BE
  scsi: sni_53c710: fix compilation error
  scsi: scsi_dh_alua: handle RTPG sense code correctly during state transitions
  scsi: qla2xxx: fix a potential NULL pointer dereference

scsi: scsi_dh_alua: handle RTPG sense code correctly during state transitions

2019-10-10T03:29:20+00:00

Some arrays are not capable of returning RTPG data during state
transitioning, but rather return an 'LUN not accessible, asymmetric access
state transition' sense code. In these cases we can set the state to
'transitioning' directly and don't need to evaluate the RTPG data (which we
won't have anyway).

Link: https://lore.kernel.org/r/20191007135701.32389-1-hare@suse.de
Reviewed-by: Laurence Oberman 
Reviewed-by: Ewan D. Milne 
Reviewed-by: Bart Van Assche 
Signed-off-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen