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[2001:14ba:16f3:4a00::2]) by smtp.gmail.com with ESMTPSA id c7-20020a056512074700b004a46f92a15bsm455046lfs.41.2022.10.25.08.11.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Oct 2022 08:11:54 -0700 (PDT) Date: Tue, 25 Oct 2022 18:11:49 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Greg Kroah-Hartman , "Rafael J. Wysocki" , Wolfram Sang , Akhil R , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org Subject: [PATCH v2 1/2] drivers: fwnode: fix fwnode_irq_get_byname() Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747673349759257589?= X-GMAIL-MSGID: =?utf-8?q?1747673349759257589?= The fwnode_irq_get_byname() does return 0 upon device-tree IRQ mapping failure. This is contradicting the function documentation and can potentially be a source of errors like: int probe(...) { ... irq = fwnode_irq_get_byname(); if (irq <= 0) return irq; ... } Here we do correctly check the return value from fwnode_irq_get_byname() but the driver probe will now return success. (There was already one such user in-tree). Change the fwnode_irq_get_byname() to work as documented and according to the common convention and abd always return a negative errno upon failure. Fixes: ca0acb511c21 ("device property: Add fwnode_irq_get_byname") Suggested-by: Sakari Ailus Signed-off-by: Matti Vaittinen Reviewed-by: Sakari Ailus Reviewed-by: Andy Shevchenko --- v1 => v2: - change check if (!ret) => if (ret == 0), add comment. - fix drop redundant empty line. I did a quick audit for the callers at v6.1-rc2: drivers/i2c/i2c-smbus.c drivers/iio/accel/adxl355_core.c drivers/iio/gyro/fxas21002c_core.c drivers/iio/imu/adis16480.c drivers/iio/imu/bmi160/bmi160_core.c drivers/iio/imu/bmi160/bmi160_core.c I did not spot any errors to be caused by this change. There will be a functional change in i2c-smbus.c as the probe will now return -EINVAL should the IRQ dt-mapping fail. It'd be nice if this was checked to be Ok by the peeps knowing the i2c-smbus :) --- drivers/base/property.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/base/property.c b/drivers/base/property.c index 4d6278a84868..b4ccc64f7bd2 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -964,7 +964,7 @@ EXPORT_SYMBOL(fwnode_irq_get); */ int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name) { - int index; + int index, ret; if (!name) return -EINVAL; @@ -973,7 +973,12 @@ int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name) if (index < 0) return index; - return fwnode_irq_get(fwnode, index); + ret = fwnode_irq_get(fwnode, index); + /* We treat mapping errors as invalid case */ + if (ret == 0) + return -EINVAL; + + return ret; } EXPORT_SYMBOL(fwnode_irq_get_byname); From patchwork Tue Oct 25 15:12:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matti Vaittinen X-Patchwork-Id: 10862 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp1064832wru; Tue, 25 Oct 2022 08:20:00 -0700 (PDT) X-Google-Smtp-Source: AMsMyM6bKsTriTa53cDEzSR3zDuZ4bQ9Zw5Hmm37hC6HGwOtlwS5Q+CnVwczVPCOTOrNSuVqqdlL X-Received: by 2002:a05:6402:294f:b0:461:f5ce:31e8 with SMTP id ed15-20020a056402294f00b00461f5ce31e8mr6424278edb.363.1666711200606; Tue, 25 Oct 2022 08:20:00 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1666711200; cv=none; d=google.com; s=arc-20160816; b=y6edJ9SSoHsYfDk4BjQlTRPXpgaEFiwmo6Jo1tVwu/55KUqzjZ+TKrc8Q+JxQjDz90 m/U10DJpMHaPe8viefSATRah+9+P9F2NINyaOyQgvHo97Fnb26rANb5q1sEJqvJZgLDg Pkz2dgbkDCzLp2hBnrd0SJpB7t01fVC3+QcvhSuapsNgANXK+h9gT3b2bNyn3nqjRwP9 cWnsESdQSffGcWYwU7Vt8zz6ktRWDasgrF3bodlveoaOMeWd5uVEGZ4mPdkU8gS80E/2 e5nPDr9ukll+uwd7fiAdRysNlFXN2xApsZX+/ZFPBCYppFKxp3Dm08GWDhZxS9ILi7U9 xULA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=i3VCaLUSkP0MHn9g1Bdf8SvWr5beC5vVRYzG/hEHOwM=; b=aHeZGQOfaG97zESEjUaccSJJuhx0x64tbxnTNeMktl0GEMSgiDcew4dtbwxQvfVBiI Ahi/zAOs7nhp2NhLAwaLbW8uRZJ+DMNdX4Sz6HuqCkMkvO5n21hTd5leyOt9eKlLI13O 7V9Q3ONjIq1eC9stJe8L5B8AW0Ds0IfU6/CVW4RTZh+xW5J27lv8547qN8kmnzMldM7H HTlqlde4dMmJcZhkjLizAZcE3CzfQGHltgKabtzbYtS7pa/YWNKamGr1s9oOTs+aWbvG TZekOCUmWIvnpvR3eYrW6XI1uqq+tIyO3Uhwyex9zo53+bSnMR6ZCd6Y5Jwu3ANrcOiF D64Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=KTXHatYh; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from out1.vger.email (out1.vger.email. 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[2001:14ba:16f3:4a00::2]) by smtp.gmail.com with ESMTPSA id r7-20020a2eb607000000b0026befa96249sm545053ljn.8.2022.10.25.08.12.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Oct 2022 08:12:16 -0700 (PDT) Date: Tue, 25 Oct 2022 18:12:11 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Greg Kroah-Hartman , "Rafael J. Wysocki" , Wolfram Sang , Akhil R , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org Subject: [PATCH v2 2/2] i2c: i2c-smbus: fwnode_irq_get_byname() return value fix Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747673363566833105?= X-GMAIL-MSGID: =?utf-8?q?1747673363566833105?= The fwnode_irq_get_byname() was changed to not return 0 upon failure so return value check can be adjusted to reflect the change. Signed-off-by: Matti Vaittinen Reviewed-by: Sakari Ailus Reviewed-by: Andy Shevchenko --- Depends on the mentioned return value change which is in patch 1/2. The return value change does also cause a functional change here. Eg. when IRQ mapping fails, the fwnode_irq_get_byname() no longer returns zero. This will cause also the probe here to return nonzero failure. I guess this is desired behaviour. --- drivers/i2c/i2c-smbus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/i2c-smbus.c b/drivers/i2c/i2c-smbus.c index 07c92c8495a3..d0cc4b7903ed 100644 --- a/drivers/i2c/i2c-smbus.c +++ b/drivers/i2c/i2c-smbus.c @@ -130,7 +130,7 @@ static int smbalert_probe(struct i2c_client *ara, } else { irq = fwnode_irq_get_byname(dev_fwnode(adapter->dev.parent), "smbus_alert"); - if (irq <= 0) + if (irq < 0) return irq; }