From 36cda0a7a727bc765e3f0f7a4d56905ccfd6ae57 Mon Sep 17 00:00:00 2001 From: Ed Cashin Date: Mon, 17 Dec 2012 16:03:47 -0800 Subject: [PATCH] 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 --- drivers/block/aoe/aoecmd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index 6ea27fd8954df..9aefbe3957ca6 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; -- 2.39.5