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authorDan Williams <dan.j.williams@intel.com>2011-11-28 11:29:20 -0800
committerJames Bottomley <JBottomley@Parallels.com>2012-02-19 14:06:08 -0600
commit9095a64a9aead653df320e3a6fc70835c15d46e4 (patch)
tree63ad804f78668bf28d90ea2f8c9640ce92dacdea /drivers/scsi/libsas/sas_internal.h
parenta3a142524aa4b1539a64a55087bf12ffa4b1f94e (diff)
downloadop-kernel-dev-9095a64a9aead653df320e3a6fc70835c15d46e4.zip
op-kernel-dev-9095a64a9aead653df320e3a6fc70835c15d46e4.tar.gz
[SCSI] libsas: fix timeout vs completion race
Until we have told the lldd to forget a task a timed out operation can return from the hardware at any time. Since completion frees the task we need to make sure that no tasks run their normal completion handler once eh has decided to manage the task. Similar to ata_scsi_cmd_error_handler() freeze completions to let eh judge the outcome of the race. Task collector mode is problematic because it presents a situation where a task can be timed out and aborted before the lldd has even seen it. For this case we need to guarantee that a task that an lldd has been told to forget does not get queued after the lldd says "never seen it". With sas_scsi_timed_out we achieve this with the ->task_queue_flush mutex, rather than adding more time. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/libsas/sas_internal.h')
-rw-r--r--drivers/scsi/libsas/sas_internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h
index ebe9b81..662ffcb 100644
--- a/drivers/scsi/libsas/sas_internal.h
+++ b/drivers/scsi/libsas/sas_internal.h
@@ -142,6 +142,7 @@ static inline struct domain_device *sas_alloc_device(void)
INIT_LIST_HEAD(&dev->dev_list_node);
INIT_LIST_HEAD(&dev->disco_list_node);
kref_init(&dev->kref);
+ spin_lock_init(&dev->done_lock);
}
return dev;
}
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