From mboxrd@z Thu Jan 1 00:00:00 1970 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,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 A2027C388F7 for ; Mon, 9 Nov 2020 13:38:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 57AEE206CB for ; Mon, 9 Nov 2020 13:38:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604929080; bh=NWw+EvJR+pMJNCnEb8dKP/yAa1d7ZSFJ+35CWjpXPrA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=VVZ5qyXkraMeX9RjFN0D8jK/DtSqbIjiMQ3gHZGMEtWPsY7bzB81D0XZhEoI9t1G5 seyIOi77YfBWaSid27fHdiW5z+Vq6TEV0EKpUiAmtyYKuSDWGixy1uBZPxs/yYZhqa hSLqK8VDXvuwYzpNc+AyhKs9qfzPibigs+ckmpJM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733175AbgKINh7 (ORCPT ); Mon, 9 Nov 2020 08:37:59 -0500 Received: from mail.kernel.org ([198.145.29.99]:56968 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730201AbgKINDu (ORCPT ); Mon, 9 Nov 2020 08:03:50 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A83C2206C0; Mon, 9 Nov 2020 13:03:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604927029; bh=NWw+EvJR+pMJNCnEb8dKP/yAa1d7ZSFJ+35CWjpXPrA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zR+Aa0geSilw+mTJxrTDRLJvyCMLRGR5I3Thy8KY38h2/4KAuG615H+G0NG+uGzEx Rp4s0T26aH5r0nB9wBiqvTTl31obq+FunexrBjjSw/gEmGU/MdFcRCJ5hl5/98KWPE OY1VWj26DakJ6mEsulc45UZhQIfH5BSMJgSYI9Pk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Bartosz Golaszewski , Alexandre Belloni Subject: [PATCH 4.9 079/117] rtc: rx8010: dont modify the global rtc ops Date: Mon, 9 Nov 2020 13:55:05 +0100 Message-Id: <20201109125029.437045558@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201109125025.630721781@linuxfoundation.org> References: <20201109125025.630721781@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bartosz Golaszewski commit d3b14296da69adb7825022f3224ac6137eb30abf upstream. The way the driver is implemented is buggy for the (admittedly unlikely) use case where there are two RTCs with one having an interrupt configured and the second not. This is caused by the fact that we use a global rtc_class_ops struct which we modify depending on whether the irq number is present or not. Fix it by using two const ops structs with and without alarm operations. While at it: not being able to request a configured interrupt is an error so don't ignore it and bail out of probe(). Fixes: ed13d89b08e3 ("rtc: Add Epson RX8010SJ RTC driver") Signed-off-by: Bartosz Golaszewski Signed-off-by: Alexandre Belloni Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200914154601.32245-2-brgl@bgdev.pl Signed-off-by: Greg Kroah-Hartman --- drivers/rtc/rtc-rx8010.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) --- a/drivers/rtc/rtc-rx8010.c +++ b/drivers/rtc/rtc-rx8010.c @@ -423,16 +423,26 @@ static int rx8010_ioctl(struct device *d } } -static struct rtc_class_ops rx8010_rtc_ops = { +static const struct rtc_class_ops rx8010_rtc_ops_default = { .read_time = rx8010_get_time, .set_time = rx8010_set_time, .ioctl = rx8010_ioctl, }; +static const struct rtc_class_ops rx8010_rtc_ops_alarm = { + .read_time = rx8010_get_time, + .set_time = rx8010_set_time, + .ioctl = rx8010_ioctl, + .read_alarm = rx8010_read_alarm, + .set_alarm = rx8010_set_alarm, + .alarm_irq_enable = rx8010_alarm_irq_enable, +}; + static int rx8010_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + const struct rtc_class_ops *rtc_ops; struct rx8010_data *rx8010; int err = 0; @@ -463,16 +473,16 @@ static int rx8010_probe(struct i2c_clien if (err) { dev_err(&client->dev, "unable to request IRQ\n"); - client->irq = 0; - } else { - rx8010_rtc_ops.read_alarm = rx8010_read_alarm; - rx8010_rtc_ops.set_alarm = rx8010_set_alarm; - rx8010_rtc_ops.alarm_irq_enable = rx8010_alarm_irq_enable; + return err; } + + rtc_ops = &rx8010_rtc_ops_alarm; + } else { + rtc_ops = &rx8010_rtc_ops_default; } rx8010->rtc = devm_rtc_device_register(&client->dev, client->name, - &rx8010_rtc_ops, THIS_MODULE); + rtc_ops, THIS_MODULE); if (IS_ERR(rx8010->rtc)) { dev_err(&client->dev, "unable to register the class device\n");