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rxrpc: Fix resend event time calculation

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Commit a158bdd3 ("rxrpc: Fix call timeouts") reworked the time calculation
for the next resend event.  For this calculation, "oldest" will be before
"now", so ktime_sub(oldest, now) will yield a negative value.  When passed
to nsecs_to_jiffies which expects an unsigned value, the end result will be
a very large value, and a resend event scheduled far into the future.  This
could cause calls to stall if some packets were lost.

Fix by ordering the arguments to ktime_sub correctly.

Fixes: a158bdd324 ("rxrpc: Fix call timeouts")
Signed-off-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Marc Dionne 2018-03-30 21:04:44 +01:00 committed by David Howells
parent 57b0c9d49b
commit 59299aa102
1 changed files with 1 additions and 1 deletions
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net/rxrpc/call_event.c
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@ -226,7 +226,7 @@ static void rxrpc_resend(struct rxrpc_call *call, unsigned long now_j)
ktime_to_ns(ktime_sub(skb->tstamp, max_age)));
}
resend_at = nsecs_to_jiffies(ktime_to_ns(ktime_sub(oldest, now)));
resend_at = nsecs_to_jiffies(ktime_to_ns(ktime_sub(now, oldest)));
resend_at += jiffies + rxrpc_resend_timeout;
WRITE_ONCE(call->resend_at, resend_at);