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block: add comment in blk_rq_timed_out() about why next can not be 0

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Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2008-10-30 08:53:02 +01:00
parent 565e411d76
commit 65d3618ccf
1 changed files with 6 additions and 1 deletions
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7
block/blk-timeout.c
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@ -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)); mod_timer(&q->timeout, round_jiffies_up(next));
spin_unlock_irqrestore(q->queue_lock, flags); spin_unlock_irqrestore(q->queue_lock, flags);