From patchwork Tue Apr 2 22:11:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Ogness X-Patchwork-Id: 785736 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 8192F15EFBE; Tue, 2 Apr 2024 22:11:39 +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=1712095901; cv=none; b=skC+nYvAMzO2W7ZH8tLb5v6UyhAWpJnEyTn97Y8ZWpCmdjqrxxtg9yyWxPhNIryOO+/yRVLBtBD6oUSMZh/cM3J+0e0noTDu3ivFltnr6EudkahLOm2spIfpOlDsSoZYDVTBTR7Ue2M/OMDR3w1vKJUSqoGXePc+vf6eqx5GTjM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712095901; c=relaxed/simple; bh=/X5uefQjhA750hOZTgQlvyUovMXIIaaI0zWJuuBr4mg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=D/UTyo8ERb5QH2ivoEwuh+PWsMa6fxF9FgyYm7hWMvk5A8BbuNDYwMNkTnzmAWpNHYAwgth9k5uvllJKZq22upEqFjT0H8J9M6IzmkR7eBFYby7UFwDJ+T+HFRq5kd19YaSmWaSdJ8QKD67Jl2DlKmLzLg2/6F4WIZhvhV5T0sw= 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=pV1zFXK7; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=zluu/oDS; 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="pV1zFXK7"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="zluu/oDS" From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1712095897; 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=np/D3T0A0n/PKPue9SIuCwjpbic3bBzP+cAanQ+lkJw=; b=pV1zFXK7RAbppXFv2IS8dg+AhtNAnjopkWGUF2CklgX9leSv1mvngtanG0zDD1M9HcNiHt 8fgHYo5P8BbLt/aOwP3OikrckUHgIXnFXFsFnXgxKX6BmLbStdCMdhu9kpQFllBVHoQg0h fj0rw92Zqk/LjGUqdggnaA60qWJODj5iJZjC9jGuIgMQqR8SCMdwE5PNERKXlHQiHLXheJ BbP2Umkls+hFnaKPkQFa4K9qFA79Cu2raSBpUaIArQx1ryayBkqFCkT9MK3nowVRGRGkOG EYSjzfuOKFdN1ETE8z4xRRDNz47WK0PjleGmNUApfrmwkJjihrO7Xf8FImquyA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1712095897; 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=np/D3T0A0n/PKPue9SIuCwjpbic3bBzP+cAanQ+lkJw=; b=zluu/oDSmszLBYJ/hpp2azudGkY5hPIYhQCXTs+b4t6Ld8QirZSsrSrRdoTSFQ98bEea+L RS7F5AOcNjPlSuAg== 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 v4 08/27] serial: core: Provide low-level functions to lock port Date: Wed, 3 Apr 2024 00:17:10 +0206 Message-Id: <20240402221129.2613843-9-john.ogness@linutronix.de> In-Reply-To: <20240402221129.2613843-1-john.ogness@linutronix.de> References: <20240402221129.2613843-1-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