[PATCH v2 1/2] scsi: core: avoid leaving shost->last_reset with stale value if EH does not run
From: Ewan D. Milne <hidden>
Date: 2021-10-29 19:43:17
Subsystem:
scsi subsystem, the rest · Maintainers:
"James E.J. Bottomley", "Martin K. Petersen", Linus Torvalds
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.
Fixes: e494f6a72839 ("[SCSI] improved eh timeout handler")
Cc: stable@vger.kernel.org
Signed-off-by: Ewan D. Milne <redacted>
---
drivers/scsi/hosts.c | 1 +
drivers/scsi/scsi_error.c | 25 +++++++++++++++++++++++++
drivers/scsi/scsi_lib.c | 1 +
include/scsi/scsi_cmnd.h | 2 +-
include/scsi/scsi_host.h | 1 +
5 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 3f6f14f..ff82f25 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c@@ -387,6 +387,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) shost->shost_state = SHOST_CREATED; INIT_LIST_HEAD(&shost->__devices); INIT_LIST_HEAD(&shost->__targets); + INIT_LIST_HEAD(&shost->eh_abort_list); INIT_LIST_HEAD(&shost->eh_cmd_q); INIT_LIST_HEAD(&shost->starved_list); init_waitqueue_head(&shost->host_wait);
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index b6c86cc..408d49c 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c@@ -135,6 +135,23 @@ static bool scsi_eh_should_retry_cmd(struct scsi_cmnd *cmd) return true; } +static void scsi_eh_complete_abort(struct scsi_cmnd *scmd, struct Scsi_Host *shost) +{ + unsigned long flags; + + spin_lock_irqsave(shost->host_lock, flags); + list_del_init(&scmd->eh_entry); + /* + * If the abort succeeds, and there is no further + * EH action, clear the ->last_reset time. + */ + if (list_empty(&shost->eh_abort_list) && + list_empty(&shost->eh_cmd_q)) + if (shost->eh_deadline != -1) + shost->last_reset = 0; + spin_unlock_irqrestore(shost->host_lock, flags); +} + /** * scmd_eh_abort_handler - Handle command aborts * @work: command to be aborted.
@@ -152,6 +169,7 @@ scmd_eh_abort_handler(struct work_struct *work) container_of(work, struct scsi_cmnd, abort_work.work); struct scsi_device *sdev = scmd->device; enum scsi_disposition rtn; + unsigned long flags; if (scsi_host_eh_past_deadline(sdev->host)) { SCSI_LOG_ERROR_RECOVERY(3,
@@ -175,12 +193,14 @@ scmd_eh_abort_handler(struct work_struct *work) SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_WARNING, scmd, "retry aborted command\n")); + scsi_eh_complete_abort(scmd, sdev->host); scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); return; } else { SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_WARNING, scmd, "finish aborted command\n")); + scsi_eh_complete_abort(scmd, sdev->host); scsi_finish_command(scmd); return; }
@@ -193,6 +213,9 @@ scmd_eh_abort_handler(struct work_struct *work) } } + spin_lock_irqsave(sdev->host->host_lock, flags); + list_del_init(&scmd->eh_entry); + spin_unlock_irqrestore(sdev->host->host_lock, flags); scsi_eh_scmd_add(scmd); }
@@ -223,6 +246,8 @@ scsi_abort_command(struct scsi_cmnd *scmd) spin_lock_irqsave(shost->host_lock, flags); if (shost->eh_deadline != -1 && !shost->last_reset) shost->last_reset = jiffies; + BUG_ON(!list_empty(&scmd->eh_entry)); + list_add_tail(&scmd->eh_entry, &shost->eh_abort_list); spin_unlock_irqrestore(shost->host_lock, flags); scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 5726738..05f8f6e 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c@@ -1143,6 +1143,7 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd) cmd->sense_buffer = buf; cmd->prot_sdb = prot; cmd->flags = flags; + INIT_LIST_HEAD(&cmd->eh_entry); INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler); cmd->jiffies_at_alloc = jiffies_at_alloc; cmd->retries = retries;
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index eaf04c9..59afe87 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h@@ -68,7 +68,7 @@ struct scsi_pointer { 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 7536370..1a02e58 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h@@ -556,6 +556,7 @@ 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
--
2.1.0