linux-kernel - Re: [PATCH] usb: dwc3: avoid empty-body warning

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Date:   Thu, 17 Nov 2016 13:23:43 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>, John Youn <johnyoun@...opsys.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: dwc3: avoid empty-body warning


Hi,

Arnd Bergmann <arnd@...db.de> writes:
> Building with W=1, we get a warning about harmless empty statements:
>
> drivers/usb/dwc3/ep0.c: In function 'dwc3_ep0_handle_intf':
> drivers/usb/dwc3/ep0.c:491:4: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
>
> gcc does not warn about {} here, so maybe use that instead.
> Alternatively, the code could be removed entirely as it does
> nothing.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> This has been present in the driver for a while, but the code
> just moved around, so it showed up as a new warning for me.
> I hope to eventually address all W=1 warnings as they tend to
> find real bugs elsewhere and we may as well fix it now that the
> code has changed.

Thank you, the only problem is that now checkpatch.pl warns. I'll just
remove the code and turn it into a comment. Authorship kept, let me know
if you're okay with me adding your S-o-b:

8<------------------------------------------------------------------------

From ea97b854e5c4437975c5d0e887488390410cfb30 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@...db.de>
Date: Wed, 16 Nov 2016 16:37:30 +0100
Subject: [PATCH] usb: dwc3: ep0: avoid empty-body warning

Building with W=1, we get a warning about harmless empty statements:

drivers/usb/dwc3/ep0.c: In function 'dwc3_ep0_handle_intf':
drivers/usb/dwc3/ep0.c:491:4: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]

Instead of adding empty braces which would introduce checkpatch.pl
warnings, we're just removing the code which doesn't do anything and
making sure we return 0 so USBCV tool is happy.

NYET-Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
---
 drivers/usb/dwc3/ep0.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 2b22ea7263d8..4c0664640862 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -486,12 +486,13 @@ static int dwc3_ep0_handle_intf(struct dwc3 *dwc,
 
 	switch (wValue) {
 	case USB_INTRF_FUNC_SUSPEND:
-		if (wIndex & USB_INTRF_FUNC_SUSPEND_LP)
-			/* XXX enable Low power suspend */
-			;
-		if (wIndex & USB_INTRF_FUNC_SUSPEND_RW)
-			/* XXX enable remote wakeup */
-			;
+		/*
+		 * REVISIT: Ideally we would enable some low power mode here,
+		 * however it's unclear what we should be doing here.
+		 *
+		 * For now, we're not doing anything, just making sure we return
+		 * 0 so USB Command Verifier tests pass without any errors.
+		 */
 		break;
 	default:
 		ret = -EINVAL;
-- 
2.10.1



-- 
balbi

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