linux-kernel - [PATCH 3.2 015/140] usb: host: fix incorrect updating of offset

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Message-ID: <lsq.1519831221.540472503@decadent.org.uk>
Date:   Wed, 28 Feb 2018 15:20:21 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Alan Stern" <stern@...land.harvard.edu>,
        "Colin Ian King" <colin.king@...onical.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: [PATCH 3.2 015/140] usb: host: fix incorrect updating of offset

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

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

From: Colin Ian King <colin.king@...onical.com>

commit 1d5a31582ef046d3b233f0da1a68ae26519b2f0a upstream.

The variable temp is incorrectly being updated, instead it should
be offset otherwise the loop just reads the same capability value
and loops forever.  Thanks to Alan Stern for pointing out the
correct fix to my original fix.  Fix also cleans up clang warning:

drivers/usb/host/ehci-dbg.c:840:4: warning: Value stored to 'temp'
is never read

Fixes: d49d43174400 ("USB: misc ehci updates")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/host/ehci-dbg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/host/ehci-dbg.c
+++ b/drivers/usb/host/ehci-dbg.c
@@ -785,7 +785,7 @@ static ssize_t fill_registers_buffer(str
 			default:		/* unknown */
 				break;
 			}
-			temp = (cap >> 8) & 0xff;
+			offset = (cap >> 8) & 0xff;
 		}
 	}
 #endif