6.15-stable review patch. If anyone has any objections, please let me know.
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From: Avraham Stern avraham.stern@intel.com
[ Upstream commit 422850b29e05e67c9145895bfe559940caa0caa8 ]
If no frames are received on a queue for a while, the reorder buffer head_sn may be an old one. When the next frame that is received on that queue and buffered is a subframe of an AMSDU but not the last subframe, it will not update the buffer's head_sn. When the frame release notification arrives, it will not release the buffered frame because it will look like the notification's NSSN is lower than the buffer's head_sn (because of a wraparound). Fix it by updating the head_sn when the first frame is buffered.
Signed-off-by: Avraham Stern avraham.stern@intel.com Reviewed-by: Daniel Gabay daniel.gabay@intel.com Reviewed-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Miri Korenblit miriam.rachel.korenblit@intel.com Link: https://patch.msgid.link/20250723094230.795ec0cb8817.I9ec9a3508e7935e8d1833e... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c index 14ea89f931bb..ff59a322fbcb 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c @@ -854,10 +854,15 @@ static bool iwl_mvm_reorder(struct iwl_mvm *mvm, * already ahead and it will be dropped. * If the last sub-frame is not on this queue - we will get frame * release notification with up to date NSSN. + * If this is the first frame that is stored in the buffer, the head_sn + * may be outdated. Update it based on the last NSSN to make sure it + * will be released when the frame release notification arrives. */ if (!amsdu || last_subframe) iwl_mvm_release_frames(mvm, sta, napi, baid_data, buffer, nssn); + else if (buffer->num_stored == 1) + buffer->head_sn = nssn;
spin_unlock_bh(&buffer->lock); return true;