linux-kernel - [PATCH 3.16 088/132] platform/x86: sony-laptop: Fix unintentional fall-through

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Message-ID: <lsq.1568989415.805533588@decadent.org.uk>
Date:   Fri, 20 Sep 2019 15:23:35 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Kees Cook" <keescook@...omium.org>,
        "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH 3.16 088/132] platform/x86: sony-laptop: Fix unintentional
 fall-through

3.16.74-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>

commit 1cbd7a64959d33e7a2a1fa2bf36a62b350a9fcbd upstream.

It seems that the default case should return AE_CTRL_TERMINATE, instead
of falling through to case ACPI_RESOURCE_TYPE_END_TAG and returning AE_OK;
otherwise the line of code at the end of the function is unreachable and
makes no sense:

return AE_CTRL_TERMINATE;

This fix is based on the following thread of discussion:

https://lore.kernel.org/patchwork/patch/959782/

Fixes: 33a04454527e ("sony-laptop: Add SNY6001 device handling (sonypi reimplementation)")
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/platform/x86/sony-laptop.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -4401,14 +4401,16 @@ sony_pic_read_possible_resource(struct a
 			}
 			return AE_OK;
 		}
+
+	case ACPI_RESOURCE_TYPE_END_TAG:
+		return AE_OK;
+
 	default:
 		dprintk("Resource %d isn't an IRQ nor an IO port\n",
 			resource->type);
+		return AE_CTRL_TERMINATE;
 
-	case ACPI_RESOURCE_TYPE_END_TAG:
-		return AE_OK;
 	}
-	return AE_CTRL_TERMINATE;
 }
 
 static int sony_pic_possible_resources(struct acpi_device *device)