From patchwork Tue Dec 17 20:26:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kalle Valo X-Patchwork-Id: 13912463 X-Patchwork-Delegate: quic_jjohnson@quicinc.com Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D59EA1F9EAD for ; Tue, 17 Dec 2024 20:26:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734467181; cv=none; b=O1ibFVmjilRW1zmOQNBXYkfcQdrAQ4MnBcy5J2nauLybRJN9l2MTNeQXlf7PLLFEYxqFTQYXZokeZdfmJ+Bk69RY8k8knn4LZorTdDYIKtsoO/mrjRTIeKJbr2JXqlZfAG/DyFgsKHcgaclgWR5gOP2y7KLkAs1Fg871Zs6z1WM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734467181; c=relaxed/simple; bh=oHhMU+EKio682SB2+Dh1hNm9yIecNFwww1aqgC/Qv50=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Gi6cuhcxch6FVG61HDwHaFhjPzsTHCJPkoMLbk72EvucIj41OrN50qRDv+d9bJOB6zLOoVzMTIGIut1nkhyNZmjgprQMYhXlDlcg+GabUEqDLC5CA7l+bdTHlfoPF6pEUmLOleaGuohyThl/fh5hc6oB75AWpesnoDEKGTR+l+A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UnVRgpu5; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UnVRgpu5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC24CC4CEDD; Tue, 17 Dec 2024 20:26:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734467181; bh=oHhMU+EKio682SB2+Dh1hNm9yIecNFwww1aqgC/Qv50=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UnVRgpu5leLLhjvxgOkwrCuxsBcwxrb/MwHGZeGFnOSoQBJpLRN4mdKl8a9ZV7Gtb s8A8Pl7NMtZCEe/qdPdtIBzP5DfkIbLl1n6dM6PCbad7QiGtz1ZMKphIqo4qgLZ1v8 ONc3S67ROBtiVKPsBAoRdamlUIs+O0S9MWnkBeopvikQCQrhRtdJiFdBGJQnhXbigD jfq4gl1PmREURcxOuASqmIpl5pZQmxNGnnIffmw0sqfRreMIFXYw3gU6Od93Vgah4p hB18k/6jZpuBve56SeTvISE9fYI2EwFw1BumrrgmX0aYvds16eXJ4d18uQAzTMWRpH hWTnTKXRdJ80A== From: Kalle Valo To: ath12k@lists.infradead.org Cc: linux-wireless@vger.kernel.org Subject: [PATCH 1/4] wifi: ath12k: Decrease ath12k_mac_op_remain_on_channel() stack usage Date: Tue, 17 Dec 2024 22:26:15 +0200 Message-Id: <20241217202618.1329312-2-kvalo@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241217202618.1329312-1-kvalo@kernel.org> References: <20241217202618.1329312-1-kvalo@kernel.org> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Jeff Johnson Building the ath12k driver with llvm-18.1.7-x86_64 produces the warning: drivers/net/wireless/ath/ath12k/mac.c:10028:12: warning: stack frame size (1080) exceeds limit (1024) in 'ath12k_mac_op_remain_on_channel' [-Wframe-larger-than] A major contributor to the stack usage in this function is: struct ath12k_wmi_scan_req_arg arg; Avoid the excess stack usage by dynamically allocating arg instead of declaring it on the stack. As part of the effort use __free() for both this new allocation as well as the existing chan_list allocation, and since then no central cleanup is required, replace all cleanup gotos with returns. Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1 Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 Signed-off-by: Jeff Johnson Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath12k/mac.c | 76 ++++++++++++--------------- 1 file changed, 33 insertions(+), 43 deletions(-) diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c index 186765fa95f5..05d2c75e5df2 100644 --- a/drivers/net/wireless/ath/ath12k/mac.c +++ b/drivers/net/wireless/ath/ath12k/mac.c @@ -10054,7 +10054,6 @@ static int ath12k_mac_op_remain_on_channel(struct ieee80211_hw *hw, { struct ath12k_vif *ahvif = ath12k_vif_to_ahvif(vif); struct ath12k_hw *ah = ath12k_hw_to_ah(hw); - struct ath12k_wmi_scan_req_arg arg; struct ath12k_link_vif *arvif; struct ath12k *ar; u32 scan_time_msec; @@ -10065,10 +10064,8 @@ static int ath12k_mac_op_remain_on_channel(struct ieee80211_hw *hw, lockdep_assert_wiphy(hw->wiphy); ar = ath12k_mac_select_scan_device(hw, vif, chan->center_freq); - if (!ar) { - ret = -EINVAL; - goto exit; - } + if (!ar) + return -EINVAL; /* check if any of the links of ML VIF is already started on * radio(ar) correpsondig to given scan frequency and use it, @@ -10087,15 +10084,11 @@ static int ath12k_mac_op_remain_on_channel(struct ieee80211_hw *hw, * always on the same band for the vif */ if (arvif->is_created) { - if (WARN_ON(!arvif->ar)) { - ret = -EINVAL; - goto exit; - } + if (WARN_ON(!arvif->ar)) + return -EINVAL; - if (ar != arvif->ar && arvif->is_started) { - ret = -EBUSY; - goto exit; - } + if (ar != arvif->ar && arvif->is_started) + return -EBUSY; if (ar != arvif->ar) { ath12k_mac_remove_link_interface(hw, arvif); @@ -10112,7 +10105,7 @@ static int ath12k_mac_op_remain_on_channel(struct ieee80211_hw *hw, if (ret) { ath12k_warn(ar->ab, "unable to create scan vdev for roc: %d\n", ret); - goto exit; + return ret; } } @@ -10140,37 +10133,41 @@ static int ath12k_mac_op_remain_on_channel(struct ieee80211_hw *hw, spin_unlock_bh(&ar->data_lock); if (ret) - goto exit; + return ret; scan_time_msec = hw->wiphy->max_remain_on_channel_duration * 2; - memset(&arg, 0, sizeof(arg)); - ath12k_wmi_start_scan_init(ar, &arg); - arg.num_chan = 1; - arg.chan_list = kcalloc(arg.num_chan, sizeof(*arg.chan_list), - GFP_KERNEL); - if (!arg.chan_list) { - ret = -ENOMEM; - goto exit; - } + struct ath12k_wmi_scan_req_arg *arg __free(kfree) = + kzalloc(sizeof(*arg), GFP_KERNEL); + if (!arg) + return -ENOMEM; - arg.vdev_id = arvif->vdev_id; - arg.scan_id = ATH12K_SCAN_ID; - arg.chan_list[0] = chan->center_freq; - arg.dwell_time_active = scan_time_msec; - arg.dwell_time_passive = scan_time_msec; - arg.max_scan_time = scan_time_msec; - arg.scan_f_passive = 1; - arg.burst_duration = duration; + ath12k_wmi_start_scan_init(ar, arg); + arg->num_chan = 1; - ret = ath12k_start_scan(ar, &arg); + u32 *chan_list __free(kfree) = kcalloc(arg->num_chan, sizeof(*chan_list), + GFP_KERNEL); + if (!chan_list) + return -ENOMEM; + + arg->chan_list = chan_list; + arg->vdev_id = arvif->vdev_id; + arg->scan_id = ATH12K_SCAN_ID; + arg->chan_list[0] = chan->center_freq; + arg->dwell_time_active = scan_time_msec; + arg->dwell_time_passive = scan_time_msec; + arg->max_scan_time = scan_time_msec; + arg->scan_f_passive = 1; + arg->burst_duration = duration; + + ret = ath12k_start_scan(ar, arg); if (ret) { ath12k_warn(ar->ab, "failed to start roc scan: %d\n", ret); spin_lock_bh(&ar->data_lock); ar->scan.state = ATH12K_SCAN_IDLE; spin_unlock_bh(&ar->data_lock); - goto free_chan_list; + return ret; } ret = wait_for_completion_timeout(&ar->scan.on_channel, 3 * HZ); @@ -10179,20 +10176,13 @@ static int ath12k_mac_op_remain_on_channel(struct ieee80211_hw *hw, ret = ath12k_scan_stop(ar); if (ret) ath12k_warn(ar->ab, "failed to stop scan: %d\n", ret); - ret = -ETIMEDOUT; - goto free_chan_list; + return -ETIMEDOUT; } ieee80211_queue_delayed_work(hw, &ar->scan.timeout, msecs_to_jiffies(duration)); - ret = 0; - -free_chan_list: - kfree(arg.chan_list); - -exit: - return ret; + return 0; } static void ath12k_mac_op_set_rekey_data(struct ieee80211_hw *hw,