linux-kernel - [PATCH] counter: add defaults to switch-statements

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Date:   Sun, 27 Feb 2022 08:17:46 -0800
From:   trix@...hat.com
To:     vilhelm.gray@...il.com, nathan@...nel.org, ndesaulniers@...gle.com,
        Jonathan.Cameron@...wei.com
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Tom Rix <trix@...hat.com>
Subject: [PATCH] counter: add defaults to switch-statements

From: Tom Rix <trix@...hat.com>

Clang static analysis reports this representative problem
counter-chrdev.c:482:3: warning: Undefined or garbage value
  returned to caller
  return ret;
  ^~~~~~~~~~

counter_get_data() has a multilevel switches, some without
defaults, so ret is sometimes not set.
Add returning -EINVAL similar to other defaults.

Fixes: b6c50affda59 ("counter: Add character device interface")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/counter/counter-chrdev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/counter/counter-chrdev.c b/drivers/counter/counter-chrdev.c
index b7c62f957a6a8..69d340be9c93f 100644
--- a/drivers/counter/counter-chrdev.c
+++ b/drivers/counter/counter-chrdev.c
@@ -477,6 +477,8 @@ static int counter_get_data(struct counter_device *const counter,
 		case COUNTER_SCOPE_COUNT:
 			ret = comp->count_u8_read(counter, parent, &value_u8);
 			break;
+		default:
+			return -EINVAL;
 		}
 		*value = value_u8;
 		return ret;
@@ -496,6 +498,8 @@ static int counter_get_data(struct counter_device *const counter,
 		case COUNTER_SCOPE_COUNT:
 			ret = comp->count_u32_read(counter, parent, &value_u32);
 			break;
+		default:
+			return -EINVAL;
 		}
 		*value = value_u32;
 		return ret;
-- 
2.26.3