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Wysocki" , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, andy.shevchenko@gmail.com, Mark Brown , Russell King - ARM Linux , Neil Armstrong , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Daniel Vetter , dri-devel@lists.freedesktop.org (open list:DRM DRIVERS) Subject: [PATCH v9 1/4] driver core: add device probe log helper Date: Mon, 13 Jul 2020 16:43:21 +0200 Message-Id: <20200713144324.23654-2-a.hajda@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200713144324.23654-1-a.hajda@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSe0hTURzHObuP3S0nt7nypJU0CHqQlgadHtSKgksQFmFFUbryqpmbsesj CzKs5iPzkWm6Hmqp6axm85UTH6zwkW2kpqj5yJLALLTUrGGZ8yr99/19f5/f63AoTGohXKiz 6jBWo1aGyEkxXtHw27pBxjn4bjQVEajnmZVAwykvAXqeaSBQ+uAQiWYqUjH0bnKURFcfGUjU MTWMoeavHTiKT80TIuOnTgK1m+6RyJxeA9DTV31CZE46ge5PpGMKmmnvbMWY0a7rQqbmZw7O VOn6hMzduCyCMerjSaYppU3A1N1/ImQGbjQKmNK8aCapTA+Y+ptpODNuXHlQcly8w58NORvB ajx2+omD6gxxgvOmpRemc2rxK6BamgAoCtKbYfddRQIQU1K6EEBr0hjggwkAc43fST4YBzDf nI8nANFcRVvbZ4JPPAbQ+GaBmi0Zqikn7BRJr4V/SrtJu5bRXjDZohPaIYy24bAjVjsHOdEK WBL7bg7C6dUwdaoYs2sJjeAHs25+nBssLqnH7MuK6K0wO+movQ+kvwnhg+qPQp7ZC9umWwW8 doJfGsvm/eVwpip73o+GA4XXML44DsDykiqMT2yHvVYbaR+AzW5tMHnw9m4Y2zyC84/kCLu+ Lbbb2Ky8VXEH420JjNNKeXoVHLCUzzd0hvlvJ0leM7DgdebcJVI6EcCGmegU4Kb7PysHAD1w ZsM5VSDLearZSHdOqeLC1YHuZ0JVRjD7yVr+Nk68AKbp02ZAU0DuIIHeDr5SQhnBRanMAFKY XCbZY2k5JZX4K6MusppQX014CMuZgSuFy50lXg+HT0rpQGUYe45lz7OahayAErlcAWV0kDXK p7lojWjwlM8vKvdIb2Vk0VP5kgBlQViAQi/rF/uNypYomoqD98bLI/AYT1I7Ol4Ymda/pceW MWRxFSdmOdUeOlD6I/Cky3vH0NsDhhWyzku9+WmX91cme7U4TTzxWO+9zFubmbGo6rZfj9g0 Fvw9Zuywbdsun33o2OUROc4FKTetwzSc8h9uQOSkYAMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrPIsWRmVeSWpSXmKPExsVy+t/xu7rCxTzxBvNXq1jcWneO1eLlhMOM FhtnrGe1mPrwCZvF/20TmS2ufH3PZtG8eD2bxdXvL5ktTr65ymLROXEJu8Wmx9dYLS7vmsNm cWjqXkaLtUfuslsc6ou2mPtlKrODgMflaxeZPd7faGX32PttAYvHzll32T1md8xk9di0qpPN 48SES0we++euYfe4332cyWPzknqPvi2rGD0O9E5m8fi8SS6AN0rPpii/tCRVISO/uMRWKdrQ wkjP0NJCz8jEUs/Q2DzWyshUSd/OJiU1J7MstUjfLkEvY//6DqaCXWIVfxbsY2lg3C3UxcjJ ISFgInHp0jPWLkYuDiGBpYwSHw5dZYNIiEvsnv+WGcIWlvhzrYsNougTo8Tsk2vYQRJsApoS fzffBGsQETCW6D87ix2kiFmgjVVi7vknYEXCAg4SG9qvgBWxCKhKTPy+Gmwqr4CFxINDs1gg NshLrN5wACjOwcEpYCkxvy8cxBQCKjnx1nMCI98CRoZVjCKppcW56bnFhnrFibnFpXnpesn5 uZsYgZG17djPzTsYL20MPsQowMGoxMMr4c8TL8SaWFZcmXuIUYKDWUmE1+ns6Tgh3pTEyqrU ovz4otKc1OJDjKZAJ01klhJNzgdGfV5JvKGpobmFpaG5sbmxmYWSOG+HwMEYIYH0xJLU7NTU gtQimD4mDk6pBsbMW6GftLkONjmathxTS4ual39tg77Gnefl9ZX7bDiZbvifebZ45f/So54J K+6uS/l4KOLq34WCRcvKZ31IXmCWXbVPrtdB77vH7Hiri95ua492tO4WbFhw9ZTtdxnHhJV9 Bz8eX7ZoBtvvs9M6Pn5NC2ta+i2pLYvV4lvj3Td/vxw9PV1ovr2iEktxRqKhFnNRcSIAvpDW 98ICAAA= X-CMS-MailID: 20200713144331eucas1p24107a30783dacc92887b80cf082be9fb X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20200713144331eucas1p24107a30783dacc92887b80cf082be9fb X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200713144331eucas1p24107a30783dacc92887b80cf082be9fb References: <20200713144324.23654-1-a.hajda@samsung.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org During probe every time driver gets resource it should usually check for error printk some message if it is not -EPROBE_DEFER and return the error. This pattern is simple but requires adding few lines after any resource acquisition code, as a result it is often omitted or implemented only partially. dev_err_probe helps to replace such code sequences with simple call, so code: if (err != -EPROBE_DEFER) dev_err(dev, ...); return err; becomes: return dev_err_probe(dev, err, ...); Signed-off-by: Andrzej Hajda Reviewed-by: Rafael J. Wysocki Reviewed-by: Mark Brown --- drivers/base/core.c | 42 ++++++++++++++++++++++++++++++++++++++++++ include/linux/device.h | 3 +++ 2 files changed, 45 insertions(+) diff --git a/drivers/base/core.c b/drivers/base/core.c index 67d39a90b45c..3a827c82933f 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -3953,6 +3953,48 @@ define_dev_printk_level(_dev_info, KERN_INFO); #endif +/** + * dev_err_probe - probe error check and log helper + * @dev: the pointer to the struct device + * @err: error value to test + * @fmt: printf-style format string + * @...: arguments as specified in the format string + * + * This helper implements common pattern present in probe functions for error + * checking: print debug or error message depending if the error value is + * -EPROBE_DEFER and propagate error upwards. + * It replaces code sequence: + * if (err != -EPROBE_DEFER) + * dev_err(dev, ...); + * else + * dev_dbg(dev, ...); + * return err; + * with + * return dev_err_probe(dev, err, ...); + * + * Returns @err. + * + */ +int dev_err_probe(const struct device *dev, int err, const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + + if (err != -EPROBE_DEFER) + dev_err(dev, "error %d: %pV", err, &vaf); + else + dev_dbg(dev, "error %d: %pV", err, &vaf); + + va_end(args); + + return err; +} +EXPORT_SYMBOL_GPL(dev_err_probe); + static inline bool fwnode_is_primary(struct fwnode_handle *fwnode) { return fwnode && !IS_ERR(fwnode->secondary); diff --git a/include/linux/device.h b/include/linux/device.h index 15460a5ac024..6b2272ae9af8 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -964,6 +964,9 @@ void device_link_remove(void *consumer, struct device *supplier); void device_links_supplier_sync_state_pause(void); void device_links_supplier_sync_state_resume(void); +extern __printf(3, 4) +int dev_err_probe(const struct device *dev, int err, const char *fmt, ...); + /* Create alias, so I can be autoloaded. */ #define MODULE_ALIAS_CHARDEV(major,minor) \ MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor)) -- 2.17.1