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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
        Ian Abbott <abbotti@mev.co.uk>
Subject: [PATCH 4.9 07/96] staging: comedi: ni_660x: fix missing break in switch statement
Date:   Tue, 12 Mar 2019 10:09:25 -0700
Message-Id: <20190312171035.120361433@linuxfoundation.org>
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4.9-stable review patch.  If anyone has any objections, please let me know.

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

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

commit 479826cc86118e0d87e5cefb3df5b748e0480924 upstream.

Add missing break statement in order to prevent the code from falling
through to the default case and return -EINVAL every time.

This bug was found thanks to the ongoing efforts to enable
-Wimplicit-fallthrough.

Fixes: aa94f2888825 ("staging: comedi: ni_660x: tidy up ni_660x_set_pfi_routing()")
Cc: stable@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/staging/comedi/drivers/ni_660x.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/staging/comedi/drivers/ni_660x.c
+++ b/drivers/staging/comedi/drivers/ni_660x.c
@@ -606,6 +606,7 @@ static int ni_660x_set_pfi_routing(struc
 	case NI_660X_PFI_OUTPUT_DIO:
 		if (chan > 31)
 			return -EINVAL;
+		break;
 	default:
 		return -EINVAL;
 	}