From patchwork Tue Feb 6 21:42:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hugo Villeneuve X-Patchwork-Id: 770567 Received: from mail.hugovil.com (mail.hugovil.com [162.243.120.170]) (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 E511F1BF27; Tue, 6 Feb 2024 21:42:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=162.243.120.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707255742; cv=none; b=BEsRG1aM7jT2oMPq891dESPJQIKEwKwqhZVapBqtg4KGyb8m1Zt9MOaqHErFmgZBtmBm7HJlm0iZovo9B+ASdNu4hXOdsyyuql9Hg0DqGMkBFK7MsA7QUsHJIyRu22GTwgxZVRhoQ84tgCTN1PgCn/rXKhC3CTnd8b4g1QBDWkc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707255742; c=relaxed/simple; bh=q9fwZBAXTcQtKBv6I5CxylABhvION6OPfRGnEWczYgM=; h=From:To:Cc:Date:Message-Id:In-Reply-To:References:MIME-Version: Subject; b=hAFDS2Zz1yS/pF95W+XQltKCpr6ym7ca1/zqap9Zs91zURURqRCE1l0dbi2VHAP0zd8ox9b7VvQLmTEYLF/T9cWkywxi6UojRcjHkOV/4du3EI9uPC6FbMB6LBsgl4DkOZml/Bw8U9UcIKS7xATthNbUJtQlfL2aTn0QbCrC9eM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=hugovil.com; spf=pass smtp.mailfrom=hugovil.com; dkim=pass (1024-bit key) header.d=hugovil.com header.i=@hugovil.com header.b=fwsW/SiH; arc=none smtp.client-ip=162.243.120.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=hugovil.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hugovil.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hugovil.com header.i=@hugovil.com header.b="fwsW/SiH" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=hugovil.com ; s=x; h=Subject:Content-Transfer-Encoding:MIME-Version:Message-Id:Date:Cc:To :From:subject:date:message-id:reply-to; bh=fRQcONYVjPAuJ2IXtLvfbv954R7Ufy3J7dtvn6r3BZs=; b=fwsW/SiHMdayWibIXMwqX98qqb /ZOySCo2eS5wf4JshM66p90SZT4ETeTQZEGXn7ueG6RaWUL/+jGMyeHsEeKcCslATc3N4nZ3KwVAr cWS25rpAKvnh7QB16RPHhvx3ZgUiTkNQrsIKEANHKFPS59DWgmpLQrPZ+qvKMc5EMNOQ=; Received: from modemcable168.174-80-70.mc.videotron.ca ([70.80.174.168]:41434 helo=pettiford.lan) by mail.hugovil.com with esmtpa (Exim 4.92) (envelope-from ) id 1rXTCs-0006XX-8A; Tue, 06 Feb 2024 16:42:19 -0500 From: Hugo Villeneuve To: gregkh@linuxfoundation.org, jirislaby@kernel.org Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, hugo@hugovil.com, Hugo Villeneuve Date: Tue, 6 Feb 2024 16:42:07 -0500 Message-Id: <20240206214208.2141067-4-hugo@hugovil.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240206214208.2141067-1-hugo@hugovil.com> References: <20240206214208.2141067-1-hugo@hugovil.com> Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SA-Exim-Connect-IP: 70.80.174.168 X-SA-Exim-Mail-From: hugo@hugovil.com X-Spam-Level: X-Spam-Report: * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP * -0.0 T_SCC_BODY_TEXT_LINE No description available. Subject: [PATCH 3/4] serial: sc16is7xx: split into core and I2C/SPI parts (sc16is7xx_lines) X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on mail.hugovil.com) From: Hugo Villeneuve Before, sc16is7xx_lines was checked for a free (zero) bit first, and then later it was set only if UART port registration succeeded. Now that sc16is7xx_lines is shared for the I2C and SPI drivers, make sure it is reserved and modified atomically, and use a new variable to hold the status of UART port regisration. Remove need to check for previous port registration in sc16is7xx_remove(), because if sc16is7xx_probe() succeeded, we are guaranteed to have successfully registered both ports. Signed-off-by: Hugo Villeneuve --- drivers/tty/serial/sc16is7xx.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index 5b53c88b7133..5073ebfc45bf 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -1468,6 +1468,7 @@ int sc16is7xx_probe(struct device *dev, const struct sc16is7xx_devtype *devtype, u32 uartclk = 0; int i, ret; struct sc16is7xx_port *s; + bool port_registered[SC16IS7XX_MAX_PORTS]; for (i = 0; i < devtype->nr_uart; i++) if (IS_ERR(regmaps[i])) @@ -1533,8 +1534,10 @@ int sc16is7xx_probe(struct device *dev, const struct sc16is7xx_devtype *devtype, SC16IS7XX_IOCONTROL_SRESET_BIT); for (i = 0; i < devtype->nr_uart; ++i) { - s->p[i].port.line = find_first_zero_bit(sc16is7xx_lines, - SC16IS7XX_MAX_DEVS); + port_registered[i] = false; + + s->p[i].port.line = find_and_set_bit(sc16is7xx_lines, + SC16IS7XX_MAX_DEVS); if (s->p[i].port.line >= SC16IS7XX_MAX_DEVS) { ret = -ERANGE; goto out_ports; @@ -1584,7 +1587,7 @@ int sc16is7xx_probe(struct device *dev, const struct sc16is7xx_devtype *devtype, if (ret) goto out_ports; - set_bit(s->p[i].port.line, sc16is7xx_lines); + port_registered[i] = true; /* Enable EFR */ sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_LCR_REG, @@ -1642,9 +1645,11 @@ int sc16is7xx_probe(struct device *dev, const struct sc16is7xx_devtype *devtype, #endif out_ports: - for (i = 0; i < devtype->nr_uart; i++) - if (test_and_clear_bit(s->p[i].port.line, sc16is7xx_lines)) + for (i = 0; i < devtype->nr_uart; i++) { + clear_bit(s->p[i].port.line, sc16is7xx_lines); + if (port_registered[i]) uart_remove_one_port(&sc16is7xx_uart, &s->p[i].port); + } kthread_stop(s->kworker_task); @@ -1667,8 +1672,8 @@ void sc16is7xx_remove(struct device *dev) for (i = 0; i < s->devtype->nr_uart; i++) { kthread_cancel_delayed_work_sync(&s->p[i].ms_work); - if (test_and_clear_bit(s->p[i].port.line, sc16is7xx_lines)) - uart_remove_one_port(&sc16is7xx_uart, &s->p[i].port); + clear_bit(s->p[i].port.line, sc16is7xx_lines); + uart_remove_one_port(&sc16is7xx_uart, &s->p[i].port); sc16is7xx_power(&s->p[i].port, 0); }