[PATCH AUTOSEL 4.9 047/251] iwlwifi: mvm: fix A-MPDU reference assignment

Sasha Levin
2020-01-16T18:13:09Z

From: Johannes Berg <johannes.berg@intel.com>

[ Upstream commit 1f7698abedeeb3fef3cbcf78e16f925df675a179 ]

The current code assigns the reference, and then goes to increment
it if the toggle bit has changed. That way, we get

Toggle 0 0 0 0 1 1 1 1
ID 1 1 1 1 1 2 2 2

Fix that by assigning the post-toggle ID to get

Toggle 0 0 0 0 1 1 1 1
ID 1 1 1 1 2 2 2 2

Reported-by: Danny Alexander <danny.alexander@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Fixes: fbe4112791b8 ("iwlwifi: mvm: update mpdu metadata API")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index c2bbc8c17beb..bc06d87a0106 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -810,12 +810,12 @@ void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE;

rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
- rx_status->ampdu_reference = mvm->ampdu_ref;
/* toggle is switched whenever new aggregation starts */
if (toggle_bit != mvm->ampdu_toggle) {
mvm->ampdu_ref++;
mvm->ampdu_toggle = toggle_bit;
}
+ rx_status->ampdu_reference = mvm->ampdu_ref;
}

rcu_read_lock();
--
2.20.1