rxrpc: Fix _usecs_to_jiffies() by using usecs_to_jiffies()

Directly using _usecs_to_jiffies() might be unsafe, so it's
better to use usecs_to_jiffies() instead.
Because we can see that the result of _usecs_to_jiffies()
could be larger than MAX_JIFFY_OFFSET values without the
check of the input.

Fixes: c410bf0 ("Fix the excessive initial retransmission timeout")
Signed-off-by: Jiasheng Jiang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: JiangJias

net/rxrpc/rtt.c

@@ -22,7 +22,7 @@ static u32 rxrpc_rto_min_us(struct rxrpc_peer *peer)
 
 static u32 __rxrpc_set_rto(const struct rxrpc_peer *peer)
 {
-	return _usecs_to_jiffies((peer->srtt_us >> 3) + peer->rttvar_us);
+	return usecs_to_jiffies((peer->srtt_us >> 3) + peer->rttvar_us);
 }
 
 static u32 rxrpc_bound_rto(u32 rto)