linux-kernel - [PATCH 2/2] media: dvb-usb: avoid -Wempty-body warnings

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Date:   Mon, 22 Mar 2021 11:07:25 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Sean Young <sean@...s.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] media: dvb-usb: avoid -Wempty-body warnings

From: Arnd Bergmann <arnd@...db.de>

Building with 'make W=1' shows many warnings -Wempty-body warnings like

drivers/media/usb/dvb-usb/vp702x-fe.c: In function 'vp702x_fe_set_frontend':
drivers/media/usb/dvb-usb/vp702x-fe.c:190:46: error: suggest braces around empty body in an 'else' statement [-Werror=empty-body]
  190 |                 deb_fe("tuning succeeded.\n");
drivers/media/usb/dvb-usb/dtt200u.c: In function 'dtt200u_rc_query':
drivers/media/usb/dvb-usb/dtt200u.c:124:58: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
  124 |                 deb_info("st->data: %*ph\n", 5, st->data);
drivers/media/usb/dvb-usb/m920x.c: In function 'm920x_rc_query':
drivers/media/usb/dvb-usb/m920x.c:207:58: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
  207 |                 deb("Unknown rc key %02x\n", rc_state[1]);

Change the empty dprintk() macros to no_printk(), which avoids this
warning and adds format string checking.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/media/usb/dvb-usb/dvb-usb.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/dvb-usb/dvb-usb.h b/drivers/media/usb/dvb-usb/dvb-usb.h
index 2b8ad2bde8a4..42f4d2fece8b 100644
--- a/drivers/media/usb/dvb-usb/dvb-usb.h
+++ b/drivers/media/usb/dvb-usb/dvb-usb.h
@@ -38,8 +38,8 @@
 }
 #define DVB_USB_DEBUG_STATUS
 #else
-#define dprintk(args...)
-#define debug_dump(b,l,func)
+#define dprintk(var,level,args...) no_printk(args)
+#define debug_dump(b,l,func) do { } while (0)
 
 #define DVB_USB_DEBUG_STATUS " (debugging is not enabled)"
 
-- 
2.29.2