linux-kernel - [PATCH v2] media: dvb_frontend.h: Fix shifting signed 32-bit value problem

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Date:   Thu, 4 Jul 2019 13:58:12 -0700
From:   Luke Nowakowski-Krijger <lnowakow@....ucsd.edu>
To:     mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: [PATCH v2] media: dvb_frontend.h: Fix shifting signed 32-bit value
 problem

Fix DVBFE_ALGO_RECOVERY and DVBFE_ALGO_SEARCH_ERROR use BIT macro which
fixes undefined behavior error by certain compilers. 

Also changed all other bit shifted definitions to use macro for better
readability. 

Signed-off-by: Luke Nowakowski-Krijger <lnowakow@....ucsd.edu>
---
 Changes in V2:
 + Added BIT macro to all bit shifted definitions
 - Removed U cast on 31 bit shifted definition
 Changes in V1:
 + Added U cast to shifting 31 bits

 include/media/dvb_frontend.h | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/include/media/dvb_frontend.h b/include/media/dvb_frontend.h
index f05cd7b94a2c..0d76fa4551b3 100644
--- a/include/media/dvb_frontend.h
+++ b/include/media/dvb_frontend.h
@@ -41,6 +41,7 @@
 #include <linux/delay.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
+#include <linux/bitops.h>
 
 #include <linux/dvb/frontend.h>
 
@@ -141,10 +142,10 @@ struct analog_parameters {
  *	These devices have AUTO recovery capabilities from LOCK failure
  */
 enum dvbfe_algo {
-	DVBFE_ALGO_HW			= (1 <<  0),
-	DVBFE_ALGO_SW			= (1 <<  1),
-	DVBFE_ALGO_CUSTOM		= (1 <<  2),
-	DVBFE_ALGO_RECOVERY		= (1 << 31)
+	DVBFE_ALGO_HW			= BIT(0),
+	DVBFE_ALGO_SW			= BIT(1),
+	DVBFE_ALGO_CUSTOM		= BIT(2),
+	DVBFE_ALGO_RECOVERY		= BIT(31),
 };
 
 /**
@@ -170,12 +171,12 @@ enum dvbfe_algo {
  *	The frontend search algorithm was requested to search again
  */
 enum dvbfe_search {
-	DVBFE_ALGO_SEARCH_SUCCESS	= (1 <<  0),
-	DVBFE_ALGO_SEARCH_ASLEEP	= (1 <<  1),
-	DVBFE_ALGO_SEARCH_FAILED	= (1 <<  2),
-	DVBFE_ALGO_SEARCH_INVALID	= (1 <<  3),
-	DVBFE_ALGO_SEARCH_AGAIN		= (1 <<  4),
-	DVBFE_ALGO_SEARCH_ERROR		= (1 << 31),
+	DVBFE_ALGO_SEARCH_SUCCESS	= BIT(0),
+	DVBFE_ALGO_SEARCH_ASLEEP	= BIT(1),
+	DVBFE_ALGO_SEARCH_FAILED	= BIT(2),
+	DVBFE_ALGO_SEARCH_INVALID	= BIT(3),
+	DVBFE_ALGO_SEARCH_AGAIN		= BIT(4),
+	DVBFE_ALGO_SEARCH_ERROR		= BIT(31),
 };
 
 /**
-- 
2.20.1