linux-kernel - [PATCH] driver core: Make dev_err

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Date: Fri, 12 Apr 2024 18:44:05 +0200
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Raag Jadav <raag.jadav@...el.com>,
	kernel@...gutronix.de,
	linux-kernel@...r.kernel.org
Subject: [PATCH] driver core: Make dev_err_probe() silent for -ENOMEM

For an out-of-memory error there should be no additional output. Adapt
dev_err_probe() to not emit the error message when err is -ENOMEM.
This simplifies handling errors that might among others be -ENOMEM.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
Hello,

I had the idea to make dev_err_probe() silent for -ENOMEM for a while now. 
Triggered by https://lore.kernel.org/all/ZhleDwUJLDEG5QwH@black.fi.intel.com I
finally implemented this idea.

Best regards
Uwe

 drivers/base/core.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 4d51928c4088..8f1914ca6b6e 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -5054,11 +5054,22 @@ int dev_err_probe(const struct device *dev, int err, const char *fmt, ...)
 	vaf.fmt = fmt;
 	vaf.va = &args;
 
-	if (err != -EPROBE_DEFER) {
-		dev_err(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
-	} else {
+	switch (err) {
+	case -EPROBE_DEFER:
 		device_set_deferred_probe_reason(dev, &vaf);
 		dev_dbg(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
+		break;
+
+	case -ENOMEM:
+		/*
+		 * We don't print anything on -ENOMEM, there is already enough
+		 * output.
+		 */
+		break;
+
+	default:
+		dev_err(dev, "error %pe: %pV", ERR_PTR(err), &vaf);
+		break;
 	}
 
 	va_end(args);

base-commit: 4118d9533ff3a5d16efb476a0d00afceecd92cf5
prerequisite-patch-id: 950b86247f1ba5dfc0396d9777d83e641ff62c35
prerequisite-patch-id: 59206f0661ac45767ecf89a11ee57a0f9ee26b3c
prerequisite-patch-id: a3ca2b5359cf23a48ca505280d967f02d9ce356c
prerequisite-patch-id: 2b7c70d39b660d374794bac26e7b5e9a7f26da8f
prerequisite-patch-id: 569cb54f9b2390be8d51979045722462e0b63f2d
prerequisite-patch-id: edc1f62b9d5c0e658c7283bd3353d2004a0c1fbf
prerequisite-patch-id: 8201835ed22aa6956d219d84299f9226fb8254c1
prerequisite-patch-id: 07772cf036deb3150560629bc287510901e90f24
prerequisite-patch-id: d84360cad6a23ccbadc1205541ffb218fa589ba7
prerequisite-patch-id: 79e7647450348ef0cca53af2bc5e5a0033dcec57
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prerequisite-patch-id: 5e0cca8fff7c73448710f42e711eff5a863b8a31
prerequisite-patch-id: 188bb3126861dc5027e5a0af78370ef8bb66fd8a
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prerequisite-patch-id: 0fd48f45bc44d66c9ca01b03d570fea876fc4abb
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prerequisite-patch-id: a64b4850058cd9189ccca081847f8908dbf91ae3
prerequisite-patch-id: 73a6bb8ed4e20eb90127f1c2e6361d52ae17791c
-- 
2.43.0