Return-path: Received: from mail-ee0-f49.google.com ([74.125.83.49]:37864 "EHLO mail-ee0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753544AbaBCU7k (ORCPT ); Mon, 3 Feb 2014 15:59:40 -0500 Received: by mail-ee0-f49.google.com with SMTP id d17so3881261eek.8 for ; Mon, 03 Feb 2014 12:59:38 -0800 (PST) From: Emmanuel Grumbach To: linux-wireless@vger.kernel.org Cc: Johannes Berg , Emmanuel Grumbach Subject: [PATCH 51/62] iwlwifi: mvm: abort scheduled scan on scan request Date: Mon, 3 Feb 2014 22:57:57 +0200 Message-Id: <1391461088-8082-51-git-send-email-egrumbach@gmail.com> (sfid-20140203_220009_932365_A64ED1C9) In-Reply-To: References: Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Johannes Berg Some older versions of wpa_supplicant don't necessarily stop scheduled scan before starting a regular scan, and there's nothing in the API that requires it either. As a consequence our driver's behaviour of not allowing scan while scheduled scan was in progress broke userspace. However, it is valid to unilaterally stop scheduled scan at any point in time, so when a regular scan request comes just abort the scheduled scan and run the regular scan. Signed-off-by: Johannes Berg Reviewed-by: Alexander Bondar Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/mvm/mac80211.c | 25 ++++++++++++++++++++++++- drivers/net/wireless/iwlwifi/mvm/ops.c | 2 +- drivers/net/wireless/iwlwifi/mvm/scan.c | 7 ++++++- 3 files changed, 31 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/iwlwifi/mvm/mac80211.c index 59b5b7a..9d9a2d0 100644 --- a/drivers/net/wireless/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/iwlwifi/mvm/mac80211.c @@ -1449,6 +1449,8 @@ static int iwl_mvm_mac_hw_scan(struct ieee80211_hw *hw, struct cfg80211_scan_request *req) { struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); + struct iwl_notification_wait wait_scan_done; + static const u8 scan_done_notif[] = { SCAN_OFFLOAD_COMPLETE, }; int ret; if (req->n_channels == 0 || req->n_channels > MAX_NUM_SCAN_CHANNELS) @@ -1456,7 +1458,28 @@ static int iwl_mvm_mac_hw_scan(struct ieee80211_hw *hw, mutex_lock(&mvm->mutex); - if (mvm->scan_status != IWL_MVM_SCAN_NONE) { + switch (mvm->scan_status) { + case IWL_MVM_SCAN_SCHED: + iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done, + scan_done_notif, + ARRAY_SIZE(scan_done_notif), + NULL, NULL); + iwl_mvm_sched_scan_stop(mvm); + ret = iwl_wait_notification(&mvm->notif_wait, + &wait_scan_done, HZ); + if (ret) { + ret = -EBUSY; + goto out; + } + /* iwl_mvm_rx_scan_offload_complete_notif() will be called + * soon but will not reset the scan status as it won't be + * IWL_MVM_SCAN_SCHED any more since we queue the next scan + * immediately (below) + */ + break; + case IWL_MVM_SCAN_NONE: + break; + default: ret = -EBUSY; goto out; } diff --git a/drivers/net/wireless/iwlwifi/mvm/ops.c b/drivers/net/wireless/iwlwifi/mvm/ops.c index 4b7fa7a..e268c15 100644 --- a/drivers/net/wireless/iwlwifi/mvm/ops.c +++ b/drivers/net/wireless/iwlwifi/mvm/ops.c @@ -228,7 +228,7 @@ static const struct iwl_rx_handlers iwl_mvm_rx_handlers[] = { RX_HANDLER(SCAN_REQUEST_CMD, iwl_mvm_rx_scan_response, false), RX_HANDLER(SCAN_COMPLETE_NOTIFICATION, iwl_mvm_rx_scan_complete, false), RX_HANDLER(SCAN_OFFLOAD_COMPLETE, - iwl_mvm_rx_scan_offload_complete_notif, false), + iwl_mvm_rx_scan_offload_complete_notif, true), RX_HANDLER(MATCH_FOUND_NOTIFICATION, iwl_mvm_rx_sched_scan_results, false), diff --git a/drivers/net/wireless/iwlwifi/mvm/scan.c b/drivers/net/wireless/iwlwifi/mvm/scan.c index 8477902..a827a13 100644 --- a/drivers/net/wireless/iwlwifi/mvm/scan.c +++ b/drivers/net/wireless/iwlwifi/mvm/scan.c @@ -511,11 +511,16 @@ int iwl_mvm_rx_scan_offload_complete_notif(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_scan_offload_complete *scan_notif = (void *)pkt->data; + /* scan status must be locked for proper checking */ + lockdep_assert_held(&mvm->mutex); + IWL_DEBUG_SCAN(mvm, "Scheduled scan completed, status %s\n", scan_notif->status == IWL_SCAN_OFFLOAD_COMPLETED ? "completed" : "aborted"); - mvm->scan_status = IWL_MVM_SCAN_NONE; + /* might already be something else again, don't reset if so */ + if (mvm->scan_status == IWL_MVM_SCAN_SCHED) + mvm->scan_status = IWL_MVM_SCAN_NONE; ieee80211_sched_scan_stopped(mvm->hw); return 0; -- 1.7.9.5