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Star64_linux/drivers/s390
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Steffen Maier 301de9b33e scsi: zfcp: Defer fc_rport blocking until after ADISC response 
commit e658519890 upstream.

Storage devices are free to send RSCNs, e.g. for internal state changes. If
this happens on all connected paths, zfcp risks temporarily losing all
paths at the same time. This has strong requirements on multipath
configuration such as "no_path_retry queue".

Avoid such situations by deferring fc_rport blocking until after the ADISC
response, when any actual state change of the remote port became clear.
The already existing port recovery triggers explicitly block the fc_rport.
The triggers are: on ADISC reject or timeout (typical cable pull case), and
on ADISC indicating that the remote port has changed its WWPN or
the port is meanwhile no longer open.

As a side effect, this also removes a confusing direct function call to
another work item function zfcp_scsi_rport_work() instead of scheduling
that other work item. It was probably done that way to have the rport block
side effect immediate and synchronous to the caller.

Fixes: a2fa0aede0 ("[SCSI] zfcp: Block FC transport rports early on errors")
Cc: stable@vger.kernel.org #v2.6.30+
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Reviewed-by: Fedor Loshakov <loshakov@linux.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Link: https://lore.kernel.org/r/20230724145156.3920244-1-maier@linux.ibm.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-08-20 16:01:35 +08:00
..
block s390/dasd: fix hanging device after quiesce/resume 2023-08-20 16:01:26 +08:00
char s390/zcore: fix race when reading from hardware system area 2023-04-19 17:52:45 +08:00
cio s390/cio: unregister device when the only path is gone 2023-08-20 15:24:04 +08:00
crypto s390/pkey: zeroize key blobs 2023-08-20 15:21:06 +08:00
net s390/qeth: Don't call dev_close/dev_open (DOWN/UP) 2023-08-20 16:01:34 +08:00
scsi scsi: zfcp: Defer fc_rport blocking until after ADISC response 2023-08-20 16:01:35 +08:00
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