linux-kernel - [PATCH v2 1/4] dev_printk: add new dev_err

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Message-Id: <20240423-dev-add_dev_errp_probe-v2-1-12f43c5d8b0d@analog.com>
Date: Tue, 23 Apr 2024 17:20:30 +0200
From: Nuno Sa via B4 Relay <devnull+nuno.sa.analog.com@...nel.org>
To: Petr Mladek <pmladek@...e.com>, 
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
 Chris Down <chris@...isdown.name>, John Ogness <john.ogness@...utronix.de>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>, 
 Olivier Moysan <olivier.moysan@...s.st.com>, 
 Andi Shyti <andi.shyti@...nel.org>, Jyoti Bhayana <jbhayana@...gle.com>
Cc: linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org, 
 Nuno Sa <nuno.sa@...log.com>
Subject: [PATCH v2 1/4] dev_printk: add new dev_err_probe() helpers

From: Nuno Sa <nuno.sa@...log.com>

This is similar to dev_err_probe() but for cases where an ERR_PTR() or
ERR_CAST() is to be returned simplifying patterns like:

	dev_err_probe(dev, ret, ...);
	return ERR_PTR(ret)
or
	dev_err_probe(dev, PTR_ERR(ptr), ...);
	return ERR_CAST(ptr)

Signed-off-by: Nuno Sa <nuno.sa@...log.com>
---
 include/linux/dev_printk.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/dev_printk.h b/include/linux/dev_printk.h
index ae80a303c216..b9623ec22350 100644
--- a/include/linux/dev_printk.h
+++ b/include/linux/dev_printk.h
@@ -277,4 +277,13 @@ do {									\
 
 __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
 
+/* Simple helper for dev_err_probe() when ERR_PTR() is to be returned. */
+#define dev_err_ptr_probe(dev, ___err, fmt, ...)	({		\
+	ERR_PTR(dev_err_probe(dev, ___err, fmt, ##__VA_ARGS__));	\
+})
+
+/* Simple helper for dev_err_probe() when ERR_CAST() is to be returned. */
+#define dev_err_cast_probe(dev, ___err_ptr, fmt, ...)	({			\
+	ERR_PTR(dev_err_probe(dev, PTR_ERR(___err_ptr), fmt, ##__VA_ARGS__));	\
+})
 #endif /* _DEVICE_PRINTK_H_ */

-- 
2.44.0