From 8382e556b1a2f30c4bf866f021b33577a64f9ebf Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Date: Wed, 11 Oct 2017 15:29:46 -0400
Subject: [PATCH] Simplify major/minor non-dynamic logic
changeset 6bbf7a855d20 ("media: dvbdev: convert DVB device types into an enum")
added a new warning on gcc 6:
>> drivers/media/dvb-core/dvbdev.c:86:1: warning: control reaches end of non-void function [-Wreturn-type]
That's because gcc is not smart enough to see that all types are
present at the switch. Also, the current code is not too optimized.
So, replace it to a more optimized one, based on a static table.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Fixes: 6bbf7a855d20 ("media: dvbdev: convert DVB device types into an enum")
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
---
drivers/media/dvb-core/dvbdev.c | 28 +++++++++++++---------------
1 file changed, 13 insertions(+), 15 deletions(-)
diff --git a/drivers/media/dvb-core/dvbdev.c b/drivers/media/dvb-core/dvbdev.c
index a53eb53a4fd5a..060c60ddfcc39 100644
--- a/drivers/media/dvb-core/dvbdev.c
+++ b/drivers/media/dvb-core/dvbdev.c
@@ -68,22 +68,20 @@ static const char * const dnames[] = {
#else
#define DVB_MAX_IDS 4
-static int nums2minor(int num, enum dvb_device_type type, int id)
-{
- int n = (num << 6) | (id << 4);
+static const u8 minor_type[] = {
+ [DVB_DEVICE_VIDEO] = 0,
+ [DVB_DEVICE_AUDIO] = 1,
+ [DVB_DEVICE_SEC] = 2,
+ [DVB_DEVICE_FRONTEND] = 3,
+ [DVB_DEVICE_DEMUX] = 4,
+ [DVB_DEVICE_DVR] = 5,
+ [DVB_DEVICE_CA] = 6,
+ [DVB_DEVICE_NET] = 7,
+ [DVB_DEVICE_OSD] = 8,
+};
- switch (type) {
- case DVB_DEVICE_VIDEO: return n;
- case DVB_DEVICE_AUDIO: return n | 1;
- case DVB_DEVICE_SEC: return n | 2;
- case DVB_DEVICE_FRONTEND: return n | 3;
- case DVB_DEVICE_DEMUX: return n | 4;
- case DVB_DEVICE_DVR: return n | 5;
- case DVB_DEVICE_CA: return n | 6;
- case DVB_DEVICE_NET: return n | 7;
- case DVB_DEVICE_OSD: return n | 8;
- }
-}
+#define nums2minor(num, type, id) \
+ (((num) << 6) | ((id) << 4) | minor_type[type])
#define MAX_DVB_MINORS (DVB_MAX_ADAPTERS*64)
#endif
--
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