Date: Sun, 23 Oct 2016 16:29:03 +0200 From: Stefan Richter Subject: firewire: net: fix maximum possible MTU Commit b3e3893e1253 ("net: use core MTU range checking in misc drivers") mistakenly introduced an upper limit for firewire-net's MTU based on the local link layer controller's reception capability. Revert this. Neither RFC 2734 nor our implementation impose any particular upper limit. Actually, to be on the safe side and to make the code explicit, set ETH_MAX_MTU = 65535 as upper limit now. (I replaced sizeof(struct rfc2734_header) by the equivalent RFC2374_FRAG_HDR_SIZE in order to avoid distracting long/int conversions.) Fixes: b3e3893e1253('net: use core MTU range checking in misc drivers') CC: netdev@vger.kernel.org CC: linux1394-devel@lists.sourceforge.net CC: Jarod Wilson Signed-off-by: Stefan Richter Acked-by: Jarod Wilson Signed-off-by: David S. Miller --- drivers/firewire/net.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c index 8430222151fc..99379542b263 100644 --- a/drivers/firewire/net.c +++ b/drivers/firewire/net.c @@ -1467,10 +1467,11 @@ static int fwnet_probe(struct fw_unit *unit, * Use the RFC 2734 default 1500 octets or the maximum payload * as initial MTU */ - net->max_mtu = (1 << (card->max_receive + 1)) - - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE; - net->mtu = min(1500U, net->max_mtu); + net->mtu = min(1500U, + (1U << (card->max_receive + 1)) + - RFC2374_FRAG_HDR_SIZE - IEEE1394_GASP_HDR_SIZE); net->min_mtu = ETH_MIN_MTU; + net->max_mtu = ETH_MAX_MTU; /* Set our hardware address while we're at it */ ha = (union fwnet_hwaddr *)net->dev_addr; -- 2.7.3