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authorEwan D. Milne <emilne@redhat.com>2021-10-29 15:43:10 -0400
committerMartin K. Petersen <martin.petersen@oracle.com>2021-11-03 21:33:50 -0400
commit5ae17501bc62a49b0b193dcce003f16375f16654 (patch)
tree62c17bc18a2c76cae1b691dae9c9b9a41bb0783c /drivers/scsi
parent5f7cf82c1d7373fcf9e1062f5654efd5fa2b9211 (diff)
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 'drivers/scsi')
-rw-r--r--drivers/scsi/hosts.c1
-rw-r--r--drivers/scsi/scsi_error.c25
-rw-r--r--drivers/scsi/scsi_lib.c1
3 files changed, 27 insertions, 0 deletions
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 17aef936bc90..2cb7163e24cc 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 3de03925550e..bdf782d9cb86 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -133,6 +133,23 @@ 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.
@@ -150,6 +167,7 @@ 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,
@@ -173,12 +191,14 @@ 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;
}
@@ -191,6 +211,9 @@ 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);
}
@@ -221,6 +244,8 @@ 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 d0b7c6dc74f8..c851c05d6091 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;