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Mon, 29 Jun 2020 11:22:47 +0000 (GMT) From: Andrzej Hajda To: Greg Kroah-Hartman Subject: [PATCH v7 1/4] driver core: add device probe log helper Date: Mon, 29 Jun 2020 13:22:39 +0200 Message-Id: <20200629112242.18380-2-a.hajda@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200629112242.18380-1-a.hajda@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSWUxTQRSGnd4VYsmlIoxIBBqXQIJL0DgGFzA+XN9c3jAgVa9IoAVbCmJi MChYakUoEoRKNLIUUBarNIJRsRqqYKGySRUsgj4UFVRAUlSw5aK+fef/zzYnQ2MiC+FPJ8hS OblMkiQmPXFjm7MzjO5yxm4sN69Db+o7CeTIfwrQnasNBCp6/4FE88YCDPVOT5DoXHkDifpm HBh68bkPR7kFFRQyjPYTqKflGolMRQ8Bqns2RCFT3iFUNlWERTJsT/8rjJ0YyKbYhz9u4Gxz 6RDF6lQlBGuozSXZ5/ndAvZx2W2KtV80C9i7FZls3r1awLZeKsTZScOqfcJoz+3HuKSENE6+ YWec54n27jEiReN7SjViw84CrUgNPGjIbIbOd/OYGnjSIqYawOFXL3E+mALw7WCegA8mAWwp t7oCaqGkMZqX9QCOthnBv4LWKTXubksyIfD3XRvpZh8mHF62lFLuJIyZxWHfhRzCbSxjImGu fghzM86sgYV1BZSbhQyCH79+Ivj9AuGtxtaFHA9mG+yxlgBed1Awr/gkz3tgpUO/mL8Mjpnv UTwHwPnm6wKeM6G9+vzCOyGjArCpsRnjjQg42Dnr2pR2bRcCG1o28HIU/NVWgrtlyHjBgS/e bhlzodZYjPGyEKpyFq8YDO2WpsWGfrDSOk3yzMKXP3Mp/j4aAKuNOkE+CCz9P+wGALXAj1Mq pPGcYpOMS1+vkEgVSln8+qPJUgNwfbKOOfP3+2C6+4gJMDQQLxXGdTpjRYQkTZEhNQFIY2If 4W5LR6xIeEyScZqTJx+WK5M4hQmspHGxnzD8piNGxMRLUrlEjkvh5H9dAe3hfxZolpeNO+W+ q+2JGVt7l4RUBhhtQkdAVBXzYNY7y5YeZI7TPFkXGnGwTt/S1w9Cd6jNXQYtWf8iGzsw/Hg8 NebK/uPOsFhrwa6gLVXt02vPKGt02PADq1ne+y15c/+jDI+s9EeW4DmdQJ1ZM/VjRdNrbXHN 3sj62rGRMa+Zd752Ma44IdkUiskVkj9CWkN8YAMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrPIsWRmVeSWpSXmKPExsVy+t/xu7oc53/GGTQ18VjcWneO1eLlhMOM FhtnrGe1mPrwCZvF/20TmS2ufH3PZtG8eD2bxdXvL5ktTr65ymLROXEJu8Wmx9dYLS7vmsNm cWjqXkaLtUfuslsc6ou2mPtlKrODgMflaxeZPd7faGX32PttAYvHzll32T1md8xk9di0qpPN 48SES0we++euYfe4332cyWPzknqPvi2rGD0O9E5m8fi8SS6AN0rPpii/tCRVISO/uMRWKdrQ wkjP0NJCz8jEUs/Q2DzWyshUSd/OJiU1J7MstUjfLkEv49SlV6wFPWIVHY9uMjcwThLqYmTn kBAwkdgQ1cXIxSEksJRRYtXu26xdjJxAYXGJ3fPfMkPYwhJ/rnWxQRR9YpToXH4KrIhNQFPi 7+abbCC2iICxRP/ZWewgRcwCbawSc88/YQdJCAs4ADXcBZvEIqAqMXntRLA4r4CFxNMPr6G2 yUus3nAArIZTwFLi8oWZjCC2EFDNhaOd7BMY+RYwMqxiFEktLc5Nzy020itOzC0uzUvXS87P 3cQIjKxtx35u2cHY9S74EKMAB6MSD2/CuZ9xQqyJZcWVuYcYJTiYlUR4nc6ejhPiTUmsrEot yo8vKs1JLT7EaAp01ERmKdHkfGDU55XEG5oamltYGpobmxubWSiJ83YIHIwREkhPLEnNTk0t SC2C6WPi4JRqYEzp2lpw5MyN/f8zTk8OlVp4d9rjVWYxlWw/P68UDhbomxn/P3Hxi68G0Qoh JqF5ulxpYlWBR69cE2FQllGUPXE/VOzigaVWS89eiHn0syfmFVOke6PD1X+f3t06GGslqKVZ p2ZZtKd/mcvZqFshESXa3bpdtxya3XMDLq+K7XnROOG9iYhdoBJLcUaioRZzUXEiAFiu5E7C AgAA X-CMS-MailID: 20200629112248eucas1p187e5dac2f4f6120aacbc86e48ad0fff9 X-Msg-Generator: CA X-RootMTR: 20200629112248eucas1p187e5dac2f4f6120aacbc86e48ad0fff9 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200629112248eucas1p187e5dac2f4f6120aacbc86e48ad0fff9 References: <20200629112242.18380-1-a.hajda@samsung.com> X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jernej Skrabec , "Rafael J. Wysocki" , Jonas Karlman , Bartlomiej Zolnierkiewicz , linux-kernel@vger.kernel.org, "open list:DRM DRIVERS" , Russell King - ARM Linux , Neil Armstrong , Andrzej Hajda , andy.shevchenko@gmail.com, Mark Brown , Laurent Pinchart , Daniel Vetter , linux-arm-kernel@lists.infradead.org, Marek Szyprowski MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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 --- 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel