[PATCH v2] usb: host: Replace empty define with do while

[Corentin Labbe <clabbe@xxxxxxxxxxxx>]

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)"

Furthermore, as suggested by Joe Perches, rename the macro to INCR.

Signed-off-by: Corentin Labbe <clabbe@xxxxxxxxxxxx>
---
Changes since v1:
- rename the macro from COUNT to INCR

 drivers/usb/host/ehci-hcd.c    |  6 +++---
 drivers/usb/host/ehci-q.c      |  4 ++--
 drivers/usb/host/ehci-timer.c  |  2 +-
 drivers/usb/host/ehci.h        |  4 ++--
 drivers/usb/host/fotg210-hcd.c | 12 ++++++------
 drivers/usb/host/fotg210.h     |  4 ++--
 6 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 8608ac513fb7..64186cf59c33 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -730,9 +730,9 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
 	/* normal [4.15.1.2] or error [4.15.1.1] completion */
 	if (likely ((status & (STS_INT|STS_ERR)) != 0)) {
 		if (likely ((status & STS_ERR) == 0))
-			COUNT (ehci->stats.normal);
+			INCR(ehci->stats.normal);
 		else
-			COUNT (ehci->stats.error);
+			INCR(ehci->stats.error);
 		bh = 1;
 	}
 
@@ -756,7 +756,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
 		if (cmd & CMD_IAAD)
 			ehci_dbg(ehci, "IAA with IAAD still set?\n");
 		if (ehci->iaa_in_progress)
-			COUNT(ehci->stats.iaa);
+			INCR(ehci->stats.iaa);
 		end_iaa_cycle(ehci);
 	}
 
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 327630405695..aa2f77f1506d 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -245,12 +245,12 @@ ehci_urb_done(struct ehci_hcd *ehci, struct urb *urb, int status)
 	}
 
 	if (unlikely(urb->unlinked)) {
-		COUNT(ehci->stats.unlink);
+		INCR(ehci->stats.unlink);
 	} else {
 		/* report non-error and short read status as zero */
 		if (status == -EINPROGRESS || status == -EREMOTEIO)
 			status = 0;
-		COUNT(ehci->stats.complete);
+		INCR(ehci->stats.complete);
 	}
 
 #ifdef EHCI_URB_TRACE
diff --git a/drivers/usb/host/ehci-timer.c b/drivers/usb/host/ehci-timer.c
index 4fcebda4b79d..a79c8ac0a55f 100644
--- a/drivers/usb/host/ehci-timer.c
+++ b/drivers/usb/host/ehci-timer.c
@@ -347,7 +347,7 @@ static void ehci_iaa_watchdog(struct ehci_hcd *ehci)
 	 */
 	status = ehci_readl(ehci, &ehci->regs->status);
 	if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
-		COUNT(ehci->stats.lost_iaa);
+		INCR(ehci->stats.lost_iaa);
 		ehci_writel(ehci, STS_IAA, &ehci->regs->status);
 	}
 
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index c8e9a48e1d51..ac5e967907d1 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -235,9 +235,9 @@ struct ehci_hcd {			/* one per controller */
 	/* irq statistics */
 #ifdef EHCI_STATS
 	struct ehci_stats	stats;
-#	define COUNT(x) ((x)++)
+#	define INCR(x) ((x)++)
 #else
-#	define COUNT(x)
+#	define INCR(x) do {} while (0)
 #endif
 
 	/* debug files */
diff --git a/drivers/usb/host/fotg210-hcd.c b/drivers/usb/host/fotg210-hcd.c
index 058ff82ea789..de43d0d326bc 100644
--- a/drivers/usb/host/fotg210-hcd.c
+++ b/drivers/usb/host/fotg210-hcd.c
@@ -1286,7 +1286,7 @@ static void fotg210_iaa_watchdog(struct fotg210_hcd *fotg210)
 		 */
 		status = fotg210_readl(fotg210, &fotg210->regs->status);
 		if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
-			COUNT(fotg210->stats.lost_iaa);
+			INCR(fotg210->stats.lost_iaa);
 			fotg210_writel(fotg210, STS_IAA,
 					&fotg210->regs->status);
 		}
@@ -2205,12 +2205,12 @@ __acquires(fotg210->lock)
 	}
 
 	if (unlikely(urb->unlinked)) {
-		COUNT(fotg210->stats.unlink);
+		INCR(fotg210->stats.unlink);
 	} else {
 		/* report non-error and short read status as zero */
 		if (status == -EINPROGRESS || status == -EREMOTEIO)
 			status = 0;
-		COUNT(fotg210->stats.complete);
+		INCR(fotg210->stats.complete);
 	}
 
 #ifdef FOTG210_URB_TRACE
@@ -5154,9 +5154,9 @@ static irqreturn_t fotg210_irq(struct usb_hcd *hcd)
 	/* normal [4.15.1.2] or error [4.15.1.1] completion */
 	if (likely((status & (STS_INT|STS_ERR)) != 0)) {
 		if (likely((status & STS_ERR) == 0))
-			COUNT(fotg210->stats.normal);
+			INCR(fotg210->stats.normal);
 		else
-			COUNT(fotg210->stats.error);
+			INCR(fotg210->stats.error);
 		bh = 1;
 	}
 
@@ -5181,7 +5181,7 @@ static irqreturn_t fotg210_irq(struct usb_hcd *hcd)
 		if (cmd & CMD_IAAD)
 			fotg210_dbg(fotg210, "IAA with IAAD still set?\n");
 		if (fotg210->async_iaa) {
-			COUNT(fotg210->stats.iaa);
+			INCR(fotg210->stats.iaa);
 			end_unlink_async(fotg210);
 		} else
 			fotg210_dbg(fotg210, "IAA with nothing unlinked?\n");
diff --git a/drivers/usb/host/fotg210.h b/drivers/usb/host/fotg210.h
index 28f6467c0cbf..1b4db95e5c43 100644
--- a/drivers/usb/host/fotg210.h
+++ b/drivers/usb/host/fotg210.h
@@ -177,9 +177,9 @@ struct fotg210_hcd {			/* one per controller */
 	/* irq statistics */
 #ifdef FOTG210_STATS
 	struct fotg210_stats	stats;
-#	define COUNT(x) ((x)++)
+#	define INCR(x) ((x)++)
 #else
-#	define COUNT(x)
+#	define INCR(x) do {} while (0)
 #endif
 
 	/* silicon clock */
-- 
2.16.4