diff options
| author | Ewan D. Milne <emilne@redhat.com> | 2021-10-29 22:43:10 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-11-04 04:33:50 +0300 |
| commit | 5ae17501bc62a49b0b193dcce003f16375f16654 (patch) | |
| tree | 62c17bc18a2c76cae1b691dae9c9b9a41bb0783c /include | |
| parent | 5f7cf82c1d7373fcf9e1062f5654efd5fa2b9211 (diff) | |
| download | linux-5ae17501bc62a49b0b193dcce003f16375f16654.tar.xz | |
scsi: core: Avoid leaving shost->last_reset with stale value if EH does not run
The changes to issue the abort from the scmd->abort_work instead of the EH
thread introduced a problem if eh_deadline is used. If aborting the
command(s) is successful, and there are never any scmds added to the
shost->eh_cmd_q, there is no code path which will reset the ->last_reset
value back to zero.
The effect of this is that after a successful abort with no EH thread
activity, a subsequent timeout, perhaps a long time later, might
immediately be considered past a user-set eh_deadline time, and the host
will be reset with no attempt at recovery.
Fix this by resetting ->last_reset back to zero in scmd_eh_abort_handler()
if it is determined that the EH thread will not run to do this.
Thanks to Gopinath Marappan for investigating this problem.
Link: https://lore.kernel.org/r/20211029194311.17504-2-emilne@redhat.com
Fixes: e494f6a72839 ("[SCSI] improved eh timeout handler")
Cc: stable@vger.kernel.org
Signed-off-by: Ewan D. Milne <emilne@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 2 | ||||
| -rw-r--r-- | include/scsi/scsi_host.h | 1 |
2 files changed, 2 insertions, 1 deletions
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index 7958a604f979..29ac40cf1aae 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -73,7 +73,7 @@ enum scsi_cmnd_submitter { struct scsi_cmnd { struct scsi_request req; struct scsi_device *device; - struct list_head eh_entry; /* entry for the host eh_cmd_q */ + struct list_head eh_entry; /* entry for the host eh_abort_list/eh_cmd_q */ struct delayed_work abort_work; struct rcu_head rcu; diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index ae715959f886..ebe059badba0 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -551,6 +551,7 @@ struct Scsi_Host { struct mutex scan_mutex;/* serialize scanning activity */ + struct list_head eh_abort_list; struct list_head eh_cmd_q; struct task_struct * ehandler; /* Error recovery thread. */ struct completion * eh_action; /* Wait for specific actions on the |