linux-kernel - [PATCH v1 1/2] driver core: add a wrapper to device probe log helper to return pointer

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Message-Id: <20220214143248.502-1-andriy.shevchenko@linux.intel.com>
Date:   Mon, 14 Feb 2022 16:32:47 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jiri Slaby <jirislaby@...nel.org>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/2] driver core: add a wrapper to device probe log helper to return pointer

Sometimes the ->probe() function can be split to the core and actual probe
parts. In such cases the core one may return a pointer to the allocated
resource, or error pointer in unsuccessful scenario. Allow that kind of
core function to use dev_err_probe_ptr(), so the following excerpt

	ret = bar(...);
	if (ret) {
		dev_err_probe(dev, ret, ...);
		return ERR_PTR(ret);
	}

can be replaced with

	ret = bar(...);
	if (ret)
		return dev_err_probe_ptr(dev, ret, ...);

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 include/linux/device.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index 93459724dcde..8650d3afbe7c 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -14,6 +14,7 @@
 
 #include <linux/dev_printk.h>
 #include <linux/energy_model.h>
+#include <linux/err.h>
 #include <linux/ioport.h>
 #include <linux/kobject.h>
 #include <linux/klist.h>
@@ -982,6 +983,13 @@ 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, ...);
 
+/* As above, but returns error pointer */
+static inline __printf(3, 0)
+void *dev_err_probe_ptr(const struct device *dev, int err, const char *fmt, va_list args)
+{
+	return ERR_PTR(dev_err_probe(dev, err, fmt, args));
+}
+
 /* Create alias, so I can be autoloaded. */
 #define MODULE_ALIAS_CHARDEV(major,minor) \
 	MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
-- 
2.34.1