linux-kernel - [PATCH 2/2] scsi: message: fusion: avoid -Wempty-body warnings

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Date:   Mon, 22 Mar 2021 11:25:44 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Sathya Prakash <sathya.prakash@...adcom.com>,
        Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@...adcom.com>
Cc:     Arnd Bergmann <arnd@...db.de>, MPT-FusionLinux.pdl@...adcom.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] scsi: message: fusion: avoid -Wempty-body warnings

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

There are a couple of warnings in this driver when building with W=1:

drivers/message/fusion/mptbase.c: In function 'PrimeIocFifos':
drivers/message/fusion/mptbase.c:4608:65: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
 4608 |                     "restoring 64 bit addressing\n", ioc->name));
      |                                                                 ^
drivers/message/fusion/mptbase.c:4633:65: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
 4633 |                     "restoring 64 bit addressing\n", ioc->name));

The macros are slightly suboptimal since are not proper statements.
Change both versions to the usual "do { ... } while (0)" style to
make them more robust and avoid the warning.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/message/fusion/mptdebug.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/message/fusion/mptdebug.h b/drivers/message/fusion/mptdebug.h
index 2205dcab0adb..c281b1359419 100644
--- a/drivers/message/fusion/mptdebug.h
+++ b/drivers/message/fusion/mptdebug.h
@@ -67,12 +67,13 @@
 
 #ifdef CONFIG_FUSION_LOGGING
 #define MPT_CHECK_LOGGING(IOC, CMD, BITS)			\
-{								\
+do {								\
 	if (IOC->debug_level & BITS)				\
 		CMD;						\
-}
+} while (0)
 #else
-#define MPT_CHECK_LOGGING(IOC, CMD, BITS)
+#define MPT_CHECK_LOGGING(IOC, CMD, BITS)			\
+do { } while (0)
 #endif
 
 
-- 
2.29.2