Complements v2.6.31 commit 55782138e47d ("tracing/events: convert block
trace points to TRACE_EVENT()") for cases where rq->rq_disk == NULL:
block_rq_requeue, block_rq_insert, block_rq_issue;
and for cases where bio == NULL:
block_getrq, block_sleeprq.
NB: The NULL pointer check for q->kobj.parent is certainly racy and
I don't have enough experience if it's good enough for a trace event.
Since I don't know when above cases would occur,
I'm not sure this is worth it.
Signed-off-by: Steffen Maier <maier@xxxxxxxxxxxxx>
---
include/trace/events/block.h | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/include/trace/events/block.h b/include/trace/events/block.h
index 6ea5a3899c2e..001e4f369df9 100644
--- a/include/trace/events/block.h
+++ b/include/trace/events/block.h
@@ -86,7 +86,9 @@ TRACE_EVENT(block_rq_requeue,
),
TP_fast_assign(
- __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
+ __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) :
+ (q->kobj.parent ?
+ container_of(q->kobj.parent, struct device, kobj)->devt : 0);
__entry->sector = blk_rq_trace_sector(rq);
__entry->nr_sector = blk_rq_trace_nr_sectors(rq);
@@ -162,7 +164,9 @@ DECLARE_EVENT_CLASS(block_rq,
),
TP_fast_assign(
- __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
+ __entry->dev = rq->rq_disk ? disk_devt(rq->rq_disk) :
+ (q->kobj.parent ?
+ container_of(q->kobj.parent, struct device, kobj)->devt : 0);
__entry->sector = blk_rq_trace_sector(rq);
__entry->nr_sector = blk_rq_trace_nr_sectors(rq);
__entry->bytes = blk_rq_bytes(rq);
@@ -397,7 +401,9 @@ DECLARE_EVENT_CLASS(block_get_rq,
),
TP_fast_assign(
- __entry->dev = bio ? bio_dev(bio) : 0;
+ __entry->dev = bio ? bio_dev(bio) :
+ (q->kobj.parent ?
+ container_of(q->kobj.parent, struct device, kobj)->devt : 0);
__entry->sector = bio ? bio->bi_iter.bi_sector : 0;
__entry->nr_sector = bio ? bio_sectors(bio) : 0;
blk_fill_rwbs(__entry->rwbs,
--
2.13.5
