[PATCH 5.3 112/148] ntb: point to right memory window index

From: Greg Kroah-Hartman
Date: Thu Oct 10 2019 - 04:42:37 EST

From: Sanjay R Mehta <sanju.mehta@xxxxxxx>

[ Upstream commit ae89339b08f3fe02457ec9edd512ddc3d246d0f8 ]

second parameter of ntb_peer_mw_get_addr is pointing to wrong memory
window index by passing "peer gidx" instead of "local gidx".

For ex, "local gidx" value is '0' and "peer gidx" value is '1', then

on peer side ntb_mw_set_trans() api is used as below with gidx pointing to
local side gidx which is '0', so memroy window '0' is chosen and XLAT '0'
will be programmed by peer side.

ntb_mw_set_trans(perf->ntb, peer->pidx, peer->gidx, peer->inbuf_xlat,

Now, on local side ntb_peer_mw_get_addr() is been used as below with gidx
pointing to "peer gidx" which is '1', so pointing to memory window '1'
instead of memory window '0'.

ntb_peer_mw_get_addr(perf->ntb, peer->gidx, &phys_addr,

So this patch pass "local gidx" as parameter to ntb_peer_mw_get_addr().

Signed-off-by: Sanjay R Mehta <sanju.mehta@xxxxxxx>
Signed-off-by: Jon Mason <jdmason@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/ntb/test/ntb_perf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c
index d028331558ea7..e9b7c2dfc7301 100644
--- a/drivers/ntb/test/ntb_perf.c
+++ b/drivers/ntb/test/ntb_perf.c
@@ -1378,7 +1378,7 @@ static int perf_setup_peer_mw(struct perf_peer *peer)
int ret;

/* Get outbound MW parameters and map it */
- ret = ntb_peer_mw_get_addr(perf->ntb, peer->gidx, &phys_addr,
+ ret = ntb_peer_mw_get_addr(perf->ntb, perf->gidx, &phys_addr,
if (ret)
return ret;