diff options
Diffstat (limited to 'package/kernel')
| -rw-r--r-- | package/kernel/mac80211/patches/304-mac80211-fix-PS-Poll-handling.patch | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/304-mac80211-fix-PS-Poll-handling.patch b/package/kernel/mac80211/patches/304-mac80211-fix-PS-Poll-handling.patch new file mode 100644 index 0000000000..cfbf662a4c --- /dev/null +++ b/package/kernel/mac80211/patches/304-mac80211-fix-PS-Poll-handling.patch @@ -0,0 +1,48 @@ +From: Emmanuel Grumbach <emmanuel.grumbach@intel.com> +Date: Sun, 20 Dec 2015 13:50:00 +0200 +Subject: [PATCH] mac80211: fix PS-Poll handling + +My commit below broken PS-Poll handling. In case the driver +has no frames buffered, driver_release_tids will be 0, but +calling find_highest_prio_tid() with 0 as a parameter is +not a good idea: +fls(0) - 1 = -1. +This bug caused mac80211 to think that frames were buffered +in the driver which in turn was confused because mac80211 +was asking to release frames that were not reported to +exist. +On iwlwifi, this led to the WARNING below: + +WARNING: CPU: 0 PID: 11230 at drivers/net/wireless/intel/iwlwifi/mvm/sta.c:1733 iwl_mvm_sta_modify_sleep_tx_count+0x2af/0x320 [iwlmvm]() +ffffffffc0627c60 ffff8800069b7648 ffffffff81888913 0000000000000000 +0000000000000000 ffff8800069b7688 ffffffff81089d6a ffff8800069b7678 +0000000000000001 ffff88003b35abf0 ffff88000698b128 ffff8800069b76d4 +Call Trace: +[<ffffffff81888913>] dump_stack+0x4c/0x65 +[<ffffffff81089d6a>] warn_slowpath_common+0x8a/0xc0 +[<ffffffff81089e5a>] warn_slowpath_null+0x1a/0x20 +[<ffffffffc05f36bf>] iwl_mvm_sta_modify_sleep_tx_count+0x2af/0x320 [iwlmvm] +[<ffffffffc05dae41>] iwl_mvm_mac_release_buffered_frames+0x31/0x40 [iwlmvm] +[<ffffffffc045d8b6>] ieee80211_sta_ps_deliver_response+0x6e6/0xd80 [mac80211] +[<ffffffffc0461296>] ieee80211_sta_ps_deliver_poll_response+0x26/0x30 [mac80211] +[<ffffffffc048f743>] ieee80211_rx_handlers+0xa83/0x2900 [mac80211] +[<ffffffffc04917ad>] ieee80211_prepare_and_rx_handle+0x1ed/0xa70 [mac80211] +[<ffffffffc045e3d5>] ? sta_info_get_bss+0x5/0x4a0 [mac80211] +[<ffffffffc04925b6>] ieee80211_rx_napi+0x586/0xcd0 [mac80211] +[<ffffffffc05eaa3e>] iwl_mvm_rx_rx_mpdu+0x59e/0xc60 [iwlmvm] + +Fixes: 0ead2510f8ce ("mac80211: allow the driver to send EOSP when needed") +Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> +--- + +--- a/net/mac80211/sta_info.c ++++ b/net/mac80211/sta_info.c +@@ -1453,7 +1453,7 @@ ieee80211_sta_ps_deliver_response(struct + + more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids); + +- if (reason == IEEE80211_FRAME_RELEASE_PSPOLL) ++ if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL) + driver_release_tids = + BIT(find_highest_prio_tid(driver_release_tids)); + |