Merge tag 'iwlwifi-for-kalle-2015-10-25' of git://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/iwlwifi-fixes

* some fixes for suspend/resume with unified FW images;
* a fix for a false-positive lockdep report;
* a fix for multi-queue that caused an unnecessary 1 second latency;
* a fix for an ACPI parsing bug that caused a misleading error message;

7 files changed, 72 insertions, 22 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
index 4fdc3dad3e85..b88e2048ae0b 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
@@ -1087,6 +1087,15 @@ iwl_mvm_netdetect_config(struct iwl_mvm *mvm,
 		ret = iwl_mvm_switch_to_d3(mvm);
 		if (ret)
 			return ret;
+	} else {
+		/* In theory, we wouldn't have to stop a running sched
+		 * scan in order to start another one (for
+		 * net-detect).  But in practice this doesn't seem to
+		 * work properly, so stop any running sched_scan now.
+		 */
+		ret = iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_SCHED, true);
+		if (ret)
+			return ret;
 	}
 
 	/* rfkill release can be either for wowlan or netdetect */
@@ -1254,7 +1263,10 @@ static int __iwl_mvm_suspend(struct ieee80211_hw *hw,
  out:
 	if (ret < 0) {
 		iwl_mvm_ref(mvm, IWL_MVM_REF_UCODE_DOWN);
-		ieee80211_restart_hw(mvm->hw);
+		if (mvm->restart_fw > 0) {
+			mvm->restart_fw--;
+			ieee80211_restart_hw(mvm->hw);
+		}
 		iwl_mvm_free_nd(mvm);
 	}
  out_noreset:
@@ -2088,6 +2100,16 @@ static int __iwl_mvm_resume(struct iwl_mvm *mvm, bool test)
 	iwl_mvm_update_changed_regdom(mvm);
 
 	if (mvm->net_detect) {
+		/* If this is a non-unified image, we restart the FW,
+		 * so no need to stop the netdetect scan.  If that
+		 * fails, continue and try to get the wake-up reasons,
+		 * but trigger a HW restart by keeping a failure code
+		 * in ret.
+		 */
+		if (unified_image)
+			ret = iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_NETDETECT,
+						false);
+
 		iwl_mvm_query_netdetect_reasons(mvm, vif);
 		/* has unlocked the mutex, so skip that */
 		goto out;
@@ -2271,7 +2293,8 @@ static void iwl_mvm_d3_test_disconn_work_iter(void *_data, u8 *mac,
 static int iwl_mvm_d3_test_release(struct inode *inode, struct file *file)
 {
 	struct iwl_mvm *mvm = inode->i_private;
-	int remaining_time = 10;
+	bool unified_image = fw_has_capa(&mvm->fw->ucode_capa,
+					 IWL_UCODE_TLV_CAPA_CNSLDTD_D3_D0_IMG);
 
 	mvm->d3_test_active = false;
 
@@ -2282,17 +2305,21 @@ static int iwl_mvm_d3_test_release(struct inode *inode, struct file *file)
 	mvm->trans->system_pm_mode = IWL_PLAT_PM_MODE_DISABLED;
 
 	iwl_abort_notification_waits(&mvm->notif_wait);
-	ieee80211_restart_hw(mvm->hw);
+	if (!unified_image) {
+		int remaining_time = 10;
 
-	/* wait for restart and disconnect all interfaces */
-	while (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
-	       remaining_time > 0) {
-		remaining_time--;
-		msleep(1000);
-	}
+		ieee80211_restart_hw(mvm->hw);
+
+		/* wait for restart and disconnect all interfaces */
+		while (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
+		       remaining_time > 0) {
+			remaining_time--;
+			msleep(1000);
+		}
 
-	if (remaining_time == 0)
-		IWL_ERR(mvm, "Timed out waiting for HW restart to finish!\n");
+		if (remaining_time == 0)
+			IWL_ERR(mvm, "Timed out waiting for HW restart!\n");
+	}
 
 	ieee80211_iterate_active_interfaces_atomic(
 		mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
index 07da4efe8458..7b7d2a146e30 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
@@ -1529,8 +1529,8 @@ static ssize_t iwl_dbgfs_mem_read(struct file *file, char __user *user_buf,
 		.data = { &cmd, },
 		.len = { sizeof(cmd) },
 	};
-	size_t delta, len;
-	ssize_t ret;
+	size_t delta;
+	ssize_t ret, len;
 
 	hcmd.id = iwl_cmd_id(*ppos >> 24 ? UMAC_RD_WR : LMAC_RD_WR,
 			     DEBUG_GROUP, 0);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 318efd814037..1db1dc13e988 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -4121,7 +4121,6 @@ void iwl_mvm_sync_rx_queues_internal(struct iwl_mvm *mvm,
 				     struct iwl_mvm_internal_rxq_notif *notif,
 				     u32 size)
 {
-	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(notif_waitq);
 	u32 qmask = BIT(mvm->trans->num_rx_queues) - 1;
 	int ret;
 
@@ -4143,7 +4142,7 @@ void iwl_mvm_sync_rx_queues_internal(struct iwl_mvm *mvm,
 	}
 
 	if (notif->sync)
-		ret = wait_event_timeout(notif_waitq,
+		ret = wait_event_timeout(mvm->rx_sync_waitq,
 					 atomic_read(&mvm->queue_sync_counter) == 0,
 					 HZ);
 	WARN_ON_ONCE(!ret);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index d17cbf603f7c..c60703e0c246 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -937,6 +937,7 @@ struct iwl_mvm {
 	/* sync d0i3_tx queue and IWL_MVM_STATUS_IN_D0I3 status flag */
 	spinlock_t d0i3_tx_lock;
 	wait_queue_head_t d0i3_exit_waitq;
+	wait_queue_head_t rx_sync_waitq;
 
 	/* BT-Coex */
 	struct iwl_bt_coex_profile_notif last_bt_notif;
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index 05fe6dd1a2c8..4d35deb628bc 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -619,6 +619,7 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 	spin_lock_init(&mvm->refs_lock);
 	skb_queue_head_init(&mvm->d0i3_tx);
 	init_waitqueue_head(&mvm->d0i3_exit_waitq);
+	init_waitqueue_head(&mvm->rx_sync_waitq);
 
 	atomic_set(&mvm->queue_sync_counter, 0);
 
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index a57c6ef5bc14..6c802cee900c 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -547,7 +547,8 @@ void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 				  "Received expired RX queue sync message\n");
 			return;
 		}
-		atomic_dec(&mvm->queue_sync_counter);
+		if (!atomic_dec_return(&mvm->queue_sync_counter))
+			wake_up(&mvm->rx_sync_waitq);
 	}
 
 	switch (internal_notif->type) {
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/scan.c b/drivers/net/wireless/intel/iwlwifi/mvm/scan.c
index f279fdd6eb44..fa9743205491 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/scan.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/scan.c
@@ -1199,6 +1199,9 @@ static int iwl_mvm_num_scans(struct iwl_mvm *mvm)
 
 static int iwl_mvm_check_running_scans(struct iwl_mvm *mvm, int type)
 {
+	bool unified_image = fw_has_capa(&mvm->fw->ucode_capa,
+					 IWL_UCODE_TLV_CAPA_CNSLDTD_D3_D0_IMG);
+
 	/* This looks a bit arbitrary, but the idea is that if we run
 	 * out of possible simultaneous scans and the userspace is
 	 * trying to run a scan type that is already running, we
@@ -1225,12 +1228,30 @@ static int iwl_mvm_check_running_scans(struct iwl_mvm *mvm, int type)
 			return -EBUSY;
 		return iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_REGULAR, true);
 	case IWL_MVM_SCAN_NETDETECT:
-		/* No need to stop anything for net-detect since the
-		 * firmware is restarted anyway.  This way, any sched
-		 * scans that were running will be restarted when we
-		 * resume.
-		*/
-		return 0;
+		/* For non-unified images, there's no need to stop
+		 * anything for net-detect since the firmware is
+		 * restarted anyway.  This way, any sched scans that
+		 * were running will be restarted when we resume.
+		 */
+		if (!unified_image)
+			return 0;
+
+		/* If this is a unified image and we ran out of scans,
+		 * we need to stop something.  Prefer stopping regular
+		 * scans, because the results are useless at this
+		 * point, and we should be able to keep running
+		 * another scheduled scan while suspended.
+		 */
+		if (mvm->scan_status & IWL_MVM_SCAN_REGULAR_MASK)
+			return iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_REGULAR,
+						 true);
+		if (mvm->scan_status & IWL_MVM_SCAN_SCHED_MASK)
+			return iwl_mvm_scan_stop(mvm, IWL_MVM_SCAN_SCHED,
+						 true);
+
+		/* fall through, something is wrong if no scan was
+		 * running but we ran out of scans.
+		 */
 	default:
 		WARN_ON(1);
 		break;