linux-kernel - [ 053/173] xhci: Fix conditional check in bandwidth calculation.

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Message-Id: <20121228190341.201180702@decadent.org.uk>
Date:	Fri, 28 Dec 2012 20:04:23 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	David Binderman <dcb314@...mail.com>
Subject: [ 053/173] xhci: Fix conditional check in bandwidth calculation.

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Sarah Sharp <sarah.a.sharp@...ux.intel.com>

commit 392a07ae3316f2b90b39ce41e66d6f6b5c95de90 upstream.

David reports that at drivers/usb/host/xhci.c:2257:

static bool xhci_is_sync_in_ep(unsigned int ep_type)
{
    return (ep_type == ISOC_IN_EP || ep_type != INT_IN_EP);
}

The static analyser cppcheck says

[linux-3.7-rc2/drivers/usb/host/xhci.c:2257]: (style) Redundant condition: If ep_type == 5, the comparison ep_type != 7 is always true.

Maybe the original programmer intention was something like

static bool xhci_is_sync_in_ep(unsigned int ep_type)
{
    return (ep_type == ISOC_IN_EP || ep_type == INT_IN_EP);
}

Fix this.

This patch should be backported to stable kernels as old as 3.2, that
contain the commit 2b69899934c63b7b9432568584fb4c4a2924f40c "xhci: USB
3.0 BW checking."

Signed-off-by: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Reported-by: David Binderman <dcb314@...mail.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/host/xhci.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 1ca0f3a..2e29f2f 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -2255,7 +2255,7 @@ static bool xhci_is_async_ep(unsigned int ep_type)
 
 static bool xhci_is_sync_in_ep(unsigned int ep_type)
 {
-	return (ep_type == ISOC_IN_EP || ep_type != INT_IN_EP);
+	return (ep_type == ISOC_IN_EP || ep_type == INT_IN_EP);
 }
 
 static unsigned int xhci_get_ss_bw_consumed(struct xhci_bw_info *ep_bw)


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