From patchwork Tue Oct 27 22:54:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Andrzej Siewior X-Patchwork-Id: 311205 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6B014C4363A for ; Tue, 27 Oct 2020 22:56:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 36D252076D for ; Tue, 27 Oct 2020 22:56:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="fnnyXMra"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="LhRto8Gj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1832569AbgJ0W4G (ORCPT ); Tue, 27 Oct 2020 18:56:06 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:50018 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1832551AbgJ0W4C (ORCPT ); Tue, 27 Oct 2020 18:56:02 -0400 From: Sebastian Andrzej Siewior DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1603839360; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JUnXmlM0pClR2oSFLL6eEWvAWYA2QW+YiY+0XjVZIZk=; b=fnnyXMraO7p09sICaO22cniixEyjU6BSK7GQa102YZaPqJxYBdda0nB0KIVATJejAL2/uz dwW8QXz8mYyHf6wvdEv7B65G3nJKntzU59jdHqIxSRlqilM5Vpr2wvnrE51RINrrYRVHRe PYThagWLiHUWO7FhC2mnHwrFy3IVdjNUgiL/XlYmlMRWAIK8uRUEfGiNl6/NLx6ZPnjmoB m4EKy+VbBc7Z5MDc3k5wsXGmgmNm3efPQ927+tdFrQs6gVq2oP42ouJmxLfX8u0K7yq3H2 VBX44HdWy79z0/CZfIzePmm3knhG8C2g58k2rdVTD1aHkbRQndTEpRqc79jH7Q== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1603839360; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JUnXmlM0pClR2oSFLL6eEWvAWYA2QW+YiY+0XjVZIZk=; b=LhRto8GjrXrS3x1WtqyEzaR2oSLcCb9lDG0/JNGC54mzzO12yMUMHiL7FS5TIt+/eyI4fV suVt8QjXdQk+iCAw== To: netdev@vger.kernel.org Cc: Aymen Sghaier , Daniel Drake , "David S. Miller" , Herbert Xu , =?utf-8?q?Horia_Geant=C4=83?= , Jakub Kicinski , Jon Mason , Jouni Malinen , Kalle Valo , Leon Romanovsky , linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-rdma@vger.kernel.org, linux-wireless@vger.kernel.org, Li Yang , Madalin Bucur , Ping-Ke Shih , Rain River , Saeed Mahameed , Samuel Chessman , Ulrich Kunitz , Zhu Yanjun , Thomas Gleixner , Sebastian Andrzej Siewior Subject: [PATCH net-next 12/15] net: rtlwifi: Remove in_interrupt() usage in halbtc_send_bt_mp_operation() Date: Tue, 27 Oct 2020 23:54:51 +0100 Message-Id: <20201027225454.3492351-13-bigeasy@linutronix.de> In-Reply-To: <20201027225454.3492351-1-bigeasy@linutronix.de> References: <20201027225454.3492351-1-bigeasy@linutronix.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org halbtc_send_bt_mp_operation() uses in_interrupt() to determine if it is safe to invoke wait_for_completion(). The usage of in_interrupt() in drivers is phased out and Linus clearly requested that code which changes behaviour depending on context should either be separated or the context be conveyed in an argument passed by the caller, which usually knows the context. Aside of that in_interrupt() is not correct as it does not catch preempt disabled regions which neither can sleep. halbtc_send_bt_mp_operation() is called from: rtl_watchdog_wq_callback() rtl_btc_periodical() halbtc_get() case BTC_GET_U4_BT_PATCH_VER: halbtc_get_bt_patch_version() which is preemtible context. rtl_c2h_content_parsing() btc_ops->btc_btinfo_notify() rtl_btc_btinfo_notify() exhalbtc_bt_info_notify() ex_btc8723b1ant_bt_info_notify() ex_btc8821a1ant_bt_info_notify() ex_btc8821a2ant_bt_info_notify() btcoexist->btc_set_bt_reg() halbtc_set_bt_reg() rtl_c2h_content_parsing() is in turn called from: rtl_c2hcmd_wq_callback() rtl_c2hcmd_launcher() which is preemptible context and from: _rtl_pci_rx_interrupt rtl_c2hcmd_enqueue() which is obviously not preemptible but limited to C2H_BT_MP commands which does invoke rtl_c2h_content_parsing(). Aside of that it can be reached from: halbtc_get() case BTC_GET_U4_SUPPORTED_FEATURE: halbtc_get_bt_coex_supported_feature() case BTC_GET_U4_BT_FORBIDDEN_SLOT_VAL: halbtc_get_bt_forbidden_slot_val() case BTC_GET_U4_BT_DEVICE_INFO: halbtc_get_bt_device_info() case BTC_GET_U4_SUPPORTED_VERSION: halbtc_get_bt_coex_supported_version() case BTC_GET_U4_SUPPORTED_FEATURE: halbtc_get_bt_coex_supported_feature() btcoexist->btc_get_bt_afh_map_from_bt() halbtc_get_bt_afh_map_from_bt() btcoexist->btc_get_ble_scan_para_from_bt() halbtc_get_ble_scan_para_from_bt() btcoexist->btc_get_ble_scan_type_from_bt() halbtc_get_ble_scan_type_from_bt() btcoexist->btc_get_ant_det_val_from_bt() halbtc_get_ant_det_val_from_bt() btcoexist->btc_get_bt_coex_supported_version() halbtc_get_bt_coex_supported_version() btcoexist->btc_get_bt_coex_supported_feature() halbtc_get_bt_coex_supported_feature() None of these have a caller. Welcome to the wonderful world of HALs and onion layers. Remove in_interrupt() check. Signed-off-by: Sebastian Andrzej Siewior Cc: Ping-Ke Shih Cc: Kalle Valo Cc: "David S. Miller" Cc: Jakub Kicinski Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org --- drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c index 2155a6699ef8d..be4c0e60d44d1 100644 --- a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c +++ b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c @@ -240,9 +240,6 @@ bool halbtc_send_bt_mp_operation(struct btc_coexist *btcoexist, u8 op_code, rtl_dbg(rtlpriv, COMP_BT_COEXIST, DBG_LOUD, "btmpinfo wait req_num=%d wait=%ld\n", req_num, wait_ms); - if (in_interrupt()) - return false; - if (wait_for_completion_timeout(&btcoexist->bt_mp_comp, msecs_to_jiffies(wait_ms)) == 0) { rtl_dbg(rtlpriv, COMP_BT_COEXIST, DBG_DMESG,