linux-kernel - [PATCH 5.16 0980/1039] rtc: Move variable into switch case statement

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Date:   Mon, 24 Jan 2022 19:46:09 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH 5.16 0980/1039] rtc: Move variable into switch case statement

From: Kees Cook <keescook@...omium.org>

commit ba52eac083e1598e748811ff58d259f77e4c5c4d upstream.

When building with automatic stack variable initialization, GCC 12
complains about variables defined outside of switch case statements.
Move the variable into the case that uses it, which silences the warning:

drivers/rtc/dev.c: In function 'rtc_dev_ioctl':
drivers/rtc/dev.c:394:30: warning: statement will never be executed [-Wswitch-unreachable]
  394 |                         long offset;
      |                              ^~~~~~

Fixes: 6a8af1b6568a ("rtc: add parameter ioctl")
Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Link: https://lore.kernel.org/r/20211209043915.1378393-1-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/rtc/dev.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/rtc/dev.c
+++ b/drivers/rtc/dev.c
@@ -391,14 +391,14 @@ static long rtc_dev_ioctl(struct file *f
 		}
 
 		switch(param.param) {
-			long offset;
 		case RTC_PARAM_FEATURES:
 			if (param.index != 0)
 				err = -EINVAL;
 			param.uvalue = rtc->features[0];
 			break;
 
-		case RTC_PARAM_CORRECTION:
+		case RTC_PARAM_CORRECTION: {
+			long offset;
 			mutex_unlock(&rtc->ops_lock);
 			if (param.index != 0)
 				return -EINVAL;
@@ -407,7 +407,7 @@ static long rtc_dev_ioctl(struct file *f
 			if (err == 0)
 				param.svalue = offset;
 			break;
-
+		}
 		default:
 			if (rtc->ops->param_get)
 				err = rtc->ops->param_get(rtc->dev.parent, &param);