diff options
| -rw-r--r-- | block/blk-timeout.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/block/blk-timeout.c b/block/blk-timeout.c index d96f7061c6fd..a09e8af8186c 100644 --- a/block/blk-timeout.c +++ b/block/blk-timeout.c @@ -199,8 +199,19 @@ void __blk_add_timer(struct request *req, struct list_head *timeout_list) expiry = round_jiffies_up(req->deadline); if (!timer_pending(&q->timeout) || - time_before(expiry, q->timeout.expires)) - mod_timer(&q->timeout, expiry); + time_before(expiry, q->timeout.expires)) { + unsigned long diff = q->timeout.expires - expiry; + + /* + * Due to added timer slack to group timers, the timer + * will often be a little in front of what we asked for. + * So apply some tolerance here too, otherwise we keep + * modifying the timer because expires for value X + * will be X + something. + */ + if (diff >= HZ / 2) + mod_timer(&q->timeout, expiry); + } } |