linux-kernel - [PATCH] checkpatch: Check for illegal return codes

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Message-Id: <1530641369-31098-1-git-send-email-pheragu@codeaurora.org>
Date:   Tue,  3 Jul 2018 11:09:29 -0700
From:   Prakruthi Deepak Heragu <pheragu@...eaurora.org>
To:     apw@...onical.com, joe@...ches.com
Cc:     linux-kernel@...r.kernel.org, ckadabi@...eaurora.org,
        tsoni@...eaurora.org, bryanh@...eaurora.org,
        Patrick Pannuto <ppannuto@...eaurora.org>,
        Stepan Moskovchenko <stepanm@...eaurora.org>,
        Prakruthi Deepak Heragu <pheragu@...eaurora.org>
Subject: [PATCH] checkpatch: Check for illegal return codes

The only legal integer return is 0, anything else
following "return" should be -ERRCODE or a function.

http://lkml.org/lkml/2010/7/23/318
  There's lots of "return -1;" statements in this patch - it's obscene
  that this is used to indicate "some error occurred" in kernel space
  rather than a real errno value - even when an existing function
  (eg, request_irq) gave you an error code already.

Signed-off-by: Patrick Pannuto <ppannuto@...eaurora.org>
Signed-off-by: Stepan Moskovchenko <stepanm@...eaurora.org>
Signed-off-by: Prakruthi Deepak Heragu <pheragu@...eaurora.org>
---
 scripts/checkpatch.pl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index a9c0550..260d252 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6197,6 +6197,12 @@ sub process {
 			     "switch default: should use break\n" . $herectx);
 		}
 
+# check for return codes on error paths
+		if ($line =~ /\breturn\s+-\d+/) {
+			ERROR("NO_ERROR_CODE",
+			      "illegal return value, please use an error code");
+		}
+
 # check for gcc specific __FUNCTION__
 		if ($line =~ /\b__FUNCTION__\b/) {
 			if (WARN("USE_FUNC",
-- 
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