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authorMika Westerberg <mika.westerberg@linux.intel.com>2017-10-25 12:27:34 +0300
committerDavid S. Miller <davem@davemloft.net>2017-10-27 06:00:00 +0300
commita78ec0d4f0eada03378413d51c92d0c1253133fa (patch)
treefdb309bb341cbb8eae0be40250815d44efaf9f91 /drivers/thunderbolt
parenta8ff8ccb45d37efa64476958fc5e9a8d9716b23b (diff)
downloadlinux-a78ec0d4f0eada03378413d51c92d0c1253133fa.tar.xz
thunderbolt: Drop sequence number check from tb_xdomain_match()
Commit 9a03c3d398c1 ("thunderbolt: Fix a couple right shifting to zero bugs") revealed an issue that was previously hidden because we never actually compared received XDomain message sequence numbers properly. The idea with these sequence numbers is that the responding host uses the same sequence number that was in the request packet which we can then check at the requesting host. However, testing against macOS it looks like it does not follow this but instead uses some other logic. Windows driver on the other hand handles it the same way than Linux. In order to be able to talk to macOS again, fix this so that we drop the whole sequence number check. This effectively works exactly the same than it worked before the aforementioned commit. This also follows the logic the original P2P networking code used. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/thunderbolt')
-rw-r--r--drivers/thunderbolt/xdomain.c9
1 files changed, 0 insertions, 9 deletions
diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c
index ff8d91189e99..f25d88d4552b 100644
--- a/drivers/thunderbolt/xdomain.c
+++ b/drivers/thunderbolt/xdomain.c
@@ -56,7 +56,6 @@ static bool tb_xdomain_match(const struct tb_cfg_request *req,
case TB_CFG_PKG_XDOMAIN_RESP: {
const struct tb_xdp_header *res_hdr = pkg->buffer;
const struct tb_xdp_header *req_hdr = req->request;
- u32 req_seq, res_seq;
if (pkg->frame.size < req->response_size / 4)
return false;
@@ -68,14 +67,6 @@ static bool tb_xdomain_match(const struct tb_cfg_request *req,
if ((res_hdr->xd_hdr.route_lo) != req_hdr->xd_hdr.route_lo)
return false;
- /* Then check that the sequence number matches */
- res_seq = res_hdr->xd_hdr.length_sn & TB_XDOMAIN_SN_MASK;
- res_seq >>= TB_XDOMAIN_SN_SHIFT;
- req_seq = req_hdr->xd_hdr.length_sn & TB_XDOMAIN_SN_MASK;
- req_seq >>= TB_XDOMAIN_SN_SHIFT;
- if (res_seq != req_seq)
- return false;
-
/* Check that the XDomain protocol matches */
if (!uuid_equal(&res_hdr->uuid, &req_hdr->uuid))
return false;