From patchwork Sun Aug 4 00:51:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Ogness X-Patchwork-Id: 816718 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 AC192B673; Sun, 4 Aug 2024 00:51:51 +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=1722732713; cv=none; b=iKQ8dL6Ogh064QE3/Vjv47pqCYLVBX9/C9lwqIaPc7+acxq6EoswOOx0Lqau1IfkT5fLkzx+2eKLz7x+p6Mk+n3NLUnJnYel2L6izceYLpYN7E50WmGlxv7J0avkEht98sy8ADvmlApdhGuPgkKfkP80XNWNWpEztUxrV/8v2Gw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722732713; c=relaxed/simple; bh=i7g9Rk6E1rRqftOtHZzjKlxcVFM+YP6E/P/94xSlZdE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=WFnmpDorX0pqKr7CKin1CWm8K4XawszJ6WKifxaWv8C/O/2yoL3r7MCRZznioCLIz2pHj5nZ/uAdX4P8lbbCI+mga1W/mJptqkz8fkBrNkaL2v3EMx2EqHvWyQT6Xom50TF0k7nPzUJIKTesRvF3d3qujv60HWrmKTOwXEWkABk= 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=iFutFd+n; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=SBE5EMqj; 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="iFutFd+n"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="SBE5EMqj" From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1722732704; 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=EwPBydyTGTYXegM2JVbnpVHJON//wTjw/xvV7q8bAP0=; b=iFutFd+nbFnB13SQ9hIqx4evQV3KuPsbFZrZfQj0rSBNxSr0adh4NRrPSHbTRuLjNRBU4n bGa0pU2JCzxzlMMqqHOvtdshDf05EzUgG+8t1Sd0gMI/m9TI5eyILXqQIjiHgFy6Dh/G2/ dEFqu2+gtSSQxi6kyjVz8512VzhdHyjX6IkYS/VeZtOumHWGoqS0fOL+1QHw+iKj0DwSbz t2Jpv+bslMfpOVzT9fgHSnOfgdPiDP48M/iI1a+lXU4adfTEQom6gncWaFGeBDbbMCf9ND i0jbbY1IEcUmvJv2eSGKQY888apUuKoBSbhx/UNlp0fmxINM8JZoipcQ6ADFLg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1722732704; 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=EwPBydyTGTYXegM2JVbnpVHJON//wTjw/xvV7q8bAP0=; b=SBE5EMqjeqcj2iTPMMaONIt+erFukqHHiehMt+23DxJToxZWAiKjamvhCzEEAw8tRiPo63 KdVZe0XST2lXL5Bg== 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 v7 10/35] serial: core: Provide low-level functions to lock port Date: Sun, 4 Aug 2024 02:57:13 +0206 Message-Id: <20240804005138.3722656-11-john.ogness@linutronix.de> In-Reply-To: <20240804005138.3722656-1-john.ogness@linutronix.de> References: <20240804005138.3722656-1-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 aea25eef9a1a..8872cd21e70a 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -590,6 +590,24 @@ 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