From patchwork Mon May 27 06:37:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Ogness X-Patchwork-Id: 800170 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 EB0BB1C686; Mon, 27 May 2024 06:38:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716791905; cv=none; b=cAfby1CcgxzP3nD4E/B9yqrNSMuQjSPgfxQFhkPYM7hyEIK+vUzaUmOe2sm5lOivfKgfjtsHlr+gWPbhoktctuG2CKLu540dNLbBoh8Nb9DDdXuBhy0MJq24qKf0ORI90kz9t8znh4Btw82VH7G9h6HgTnkeN7um9i1iVPHFu2E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716791905; c=relaxed/simple; bh=AiH8EnN6GRzi8B2qcObkU/HEqg04wntd+nSfmS7tVhM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=lf2IHOinTeNJW7o3QSgHm1xLWAoSZhia96Nl4NQTui93IwRvAVvtFA59e4SHOkf2Uy9syHwB2n2DE2HJRnLj8Vd1LyPKxx6Al/ihTgVQrBzdtSrg5t5QVNobdsIXDZRTRWhNUH7j+AXZ6STEcOzE4o4OLujqm8zkhBq62FON3i0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=MWfm1v/S; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=mtJG7MYi; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="MWfm1v/S"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="mtJG7MYi" From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1716791899; 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=TkEmSH+TeCzW4mgc3Qx6oM4UTLT7owCiQ5MwVZZnUf0=; b=MWfm1v/SDq5UBs2uYn8xLpTUBfAUg6ebL8WM55kFJWkV7h2WuzJwfQ6sgmqQnn8fSy1SPK Rm7aGRiSkufQn6TiKr9IzTkSdChmnAFZECXuFb9Dnda+stuzrxGw7JI8pJ84zHxDe6jH5C fM1UShVvGDBI23d3RFshfkf1e936Rx7Lkr9L0C7YdhIcZVZZtOEXo30FYEWgpmBEkd5t0V EVSrWhW9rExqdc5qVmVgY0uEEZskuGTukTSO29YUpeMq3DEU21ItQS8BUROysuEKJ6uqev ddCH6o5QW0AaOPvxoF1xsZPg3uJ/sUKqacDDo8UCnEy6VfqPZ01zlMpOS0fgjQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1716791899; 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=TkEmSH+TeCzW4mgc3Qx6oM4UTLT7owCiQ5MwVZZnUf0=; b=mtJG7MYiy42HnHVpBuzvx+qMo0svogSYJ75Tg/hZgZsaUKanxZKF0fBDT0V/WWRBhJ6b8M GjR5PN9ws9T84yCg== To: Petr Mladek Cc: Sergey Senozhatsky , Steven Rostedt , Thomas Gleixner , linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Jiri Slaby , linux-serial@vger.kernel.org Subject: [PATCH printk v6 08/30] serial: core: Provide low-level functions to lock port Date: Mon, 27 May 2024 08:43:27 +0206 Message-Id: <20240527063749.391035-9-john.ogness@linutronix.de> In-Reply-To: <20240527063749.391035-1-john.ogness@linutronix.de> References: <20240527063749.391035-1-john.ogness@linutronix.de> Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 It will be necessary at times for the uart nbcon console drivers to acquire the port lock directly (without the additional nbcon functionality of the port lock wrappers). These are special cases such as the implementation of the device_lock()/device_unlock() callbacks or for internal port lock wrapper synchronization. Provide low-level variants __uart_port_lock_irqsave() and __uart_port_unlock_irqrestore() for this purpose. Signed-off-by: John Ogness Reviewed-by: Petr Mladek Acked-by: Greg Kroah-Hartman --- include/linux/serial_core.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 55b1f3ba48ac..bb3324d49453 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -588,6 +588,24 @@ struct uart_port { void *private_data; /* generic platform data pointer */ }; +/* + * Only for console->device_lock()/_unlock() callbacks and internal + * port lock wrapper synchronization. + */ +static inline void __uart_port_lock_irqsave(struct uart_port *up, unsigned long *flags) +{ + spin_lock_irqsave(&up->lock, *flags); +} + +/* + * Only for console->device_lock()/_unlock() callbacks and internal + * port lock wrapper synchronization. + */ +static inline void __uart_port_unlock_irqrestore(struct uart_port *up, unsigned long flags) +{ + spin_unlock_irqrestore(&up->lock, flags); +} + /** * uart_port_lock - Lock the UART port * @up: Pointer to UART port structure