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| author | Jens Axboe <jens.axboe@oracle.com> | 2008-10-30 08:53:02 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2008-12-29 08:28:42 +0100 |
| commit | 65d3618ccfe686e8d7b3f01a838d0578182406df (patch) | |
| tree | 0a53a7d3649eb82a8e2af2c9f4e8de2d9b1b6616 /block/blk-timeout.c | |
| parent | 565e411d764eeda006738dfadbccca79d48381e1 (diff) | |
| download | lwn-65d3618ccfe686e8d7b3f01a838d0578182406df.tar.gz lwn-65d3618ccfe686e8d7b3f01a838d0578182406df.zip | |
block: add comment in blk_rq_timed_out() about why next can not be 0
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-timeout.c')
| -rw-r--r-- | block/blk-timeout.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/block/blk-timeout.c b/block/blk-timeout.c index 116bbf394fb5..99c3efc706b7 100644 --- a/block/blk-timeout.c +++ b/block/blk-timeout.c @@ -132,7 +132,12 @@ void blk_rq_timed_out_timer(unsigned long data) } } - if (next_set && !list_empty(&q->timeout_list)) + /* + * next can never be 0 here with the list non-empty, since we always + * bump ->deadline to 1 so we can detect if the timer was ever added + * or not. See comment in blk_add_timer() + */ + if (next) mod_timer(&q->timeout, round_jiffies_up(next)); spin_unlock_irqrestore(q->queue_lock, flags); |