From 0d555ecfa468f6dc29697829844f2f79909e376f Mon Sep 17 00:00:00 2001 From: Ed Cashin Date: Mon, 17 Dec 2012 16:03:47 -0800 Subject: aoe: manipulate aoedev network stats under lock With this bugfix in place the calculation of the criterion for "lateness" is performed under lock. Without the lock, there is a chance that one of the non-atomic operations performed on the round trip time statistics could be incomplete, such that an incorrect lateness criterion would be calculated. Without this change, the effect of the bug would be rare unecessary but benign retransmissions. Signed-off-by: Ed Cashin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index 6ea27fd..9aefbe3 100644 --- a/drivers/block/aoe/aoecmd.c +++ b/drivers/block/aoe/aoecmd.c @@ -603,14 +603,14 @@ rexmit_timer(ulong vp) d = (struct aoedev *) vp; + spin_lock_irqsave(&d->lock, flags); + /* timeout based on observed timings and variations */ timeout = 2 * d->rttavg >> RTTSCALE; timeout += 8 * d->rttdev >> RTTDSCALE; if (timeout == 0) timeout = 1; - spin_lock_irqsave(&d->lock, flags); - if (d->flags & DEVFL_TKILL) { spin_unlock_irqrestore(&d->lock, flags); return; -- cgit v0.10.2