linux-kernel - [PATCH] usb: Replace empty define with do while

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Date:   Thu,  7 Jun 2018 20:05:11 +0000
From:   Corentin Labbe <clabbe@...libre.com>
To:     gregkh@...uxfoundation.org, stern@...land.harvard.edu
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Corentin Labbe <clabbe@...libre.com>
Subject: [PATCH] usb: Replace empty define with do while

It's dangerous to use empty code define.
Furthermore it lead to the following warning:
"suggest braces around empty body in an « else » statement"

So let's replace emptyness by "do {} while(0)"

Signed-off-by: Corentin Labbe <clabbe@...libre.com>
---
 drivers/usb/host/ehci.h    | 2 +-
 drivers/usb/host/fotg210.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index c8e9a48e1d51..a60d91eac771 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -237,7 +237,7 @@ struct ehci_hcd {			/* one per controller */
 	struct ehci_stats	stats;
 #	define COUNT(x) ((x)++)
 #else
-#	define COUNT(x)
+#	define COUNT(x) do {} while (0)
 #endif
 
 	/* debug files */
diff --git a/drivers/usb/host/fotg210.h b/drivers/usb/host/fotg210.h
index 7fcd785c7bc8..dca46d04e288 100644
--- a/drivers/usb/host/fotg210.h
+++ b/drivers/usb/host/fotg210.h
@@ -179,7 +179,7 @@ struct fotg210_hcd {			/* one per controller */
 	struct fotg210_stats	stats;
 #	define COUNT(x) ((x)++)
 #else
-#	define COUNT(x)
+#	define COUNT(x) do {} while (0)
 #endif
 
 	/* debug files */
-- 
2.16.4