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From: Dan Carpenter <dan.carpenter@oracle.com>
To: kbuild@lists.01.org
Subject: [gustavoars-linux:testing/fallthrough 144/560] drivers/gpu/drm/drm_dp_helper.c:492 drm_dp_downstream_max_bpc() warn: ignoring unreachable code.
Date: Tue, 07 Jul 2020 17:07:17 +0300	[thread overview]
Message-ID: <20200707140717.GA2549@kadam> (raw)

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/fallthrough
head:   d7f10c2411ed9283df8d763139de9468b88c89ce
commit: 62708a516a6b158e213c46ff731260cb988dbc11 [144/560] drm: Use fallthrough pseudo-keyword
config: i386-randconfig-m021-20200703 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

smatch warnings:
drivers/gpu/drm/drm_dp_helper.c:492 drm_dp_downstream_max_bpc() warn: ignoring unreachable code.

# https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/commit/?id=62708a516a6b158e213c46ff731260cb988dbc11
git remote add gustavoars-linux https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git
git remote update gustavoars-linux
git checkout 62708a516a6b158e213c46ff731260cb988dbc11
vim +492 drivers/gpu/drm/drm_dp_helper.c

7529d6af1cd16b Mika Kahola         2016-09-09  464  int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
7529d6af1cd16b Mika Kahola         2016-09-09  465  			      const u8 port_cap[4])
7529d6af1cd16b Mika Kahola         2016-09-09  466  {
7529d6af1cd16b Mika Kahola         2016-09-09  467  	int type = port_cap[0] & DP_DS_PORT_TYPE_MASK;
7529d6af1cd16b Mika Kahola         2016-09-09  468  	bool detailed_cap_info = dpcd[DP_DOWNSTREAMPORT_PRESENT] &
7529d6af1cd16b Mika Kahola         2016-09-09  469  		DP_DETAILED_CAP_INFO_AVAILABLE;
7529d6af1cd16b Mika Kahola         2016-09-09  470  	int bpc;
7529d6af1cd16b Mika Kahola         2016-09-09  471  
7529d6af1cd16b Mika Kahola         2016-09-09  472  	if (!detailed_cap_info)
7529d6af1cd16b Mika Kahola         2016-09-09  473  		return 0;
7529d6af1cd16b Mika Kahola         2016-09-09  474  
7529d6af1cd16b Mika Kahola         2016-09-09  475  	switch (type) {
7529d6af1cd16b Mika Kahola         2016-09-09  476  	case DP_DS_PORT_TYPE_VGA:
7529d6af1cd16b Mika Kahola         2016-09-09  477  	case DP_DS_PORT_TYPE_DVI:
7529d6af1cd16b Mika Kahola         2016-09-09  478  	case DP_DS_PORT_TYPE_HDMI:
7529d6af1cd16b Mika Kahola         2016-09-09  479  	case DP_DS_PORT_TYPE_DP_DUALMODE:
7529d6af1cd16b Mika Kahola         2016-09-09  480  		bpc = port_cap[2] & DP_DS_MAX_BPC_MASK;
7529d6af1cd16b Mika Kahola         2016-09-09  481  
7529d6af1cd16b Mika Kahola         2016-09-09  482  		switch (bpc) {
7529d6af1cd16b Mika Kahola         2016-09-09  483  		case DP_DS_8BPC:
7529d6af1cd16b Mika Kahola         2016-09-09  484  			return 8;
7529d6af1cd16b Mika Kahola         2016-09-09  485  		case DP_DS_10BPC:
7529d6af1cd16b Mika Kahola         2016-09-09  486  			return 10;
7529d6af1cd16b Mika Kahola         2016-09-09  487  		case DP_DS_12BPC:
7529d6af1cd16b Mika Kahola         2016-09-09  488  			return 12;
7529d6af1cd16b Mika Kahola         2016-09-09  489  		case DP_DS_16BPC:
7529d6af1cd16b Mika Kahola         2016-09-09  490  			return 16;
7529d6af1cd16b Mika Kahola         2016-09-09  491  		}
62708a516a6b15 Gustavo A. R. Silva 2020-07-02 @492  		fallthrough;
                                                                ^^^^^^^^^^^

7529d6af1cd16b Mika Kahola         2016-09-09  493  	default:
7529d6af1cd16b Mika Kahola         2016-09-09  494  		return 0;
7529d6af1cd16b Mika Kahola         2016-09-09  495  	}
7529d6af1cd16b Mika Kahola         2016-09-09  496  }

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: kbuild-all@lists.01.org
Subject: [gustavoars-linux:testing/fallthrough 144/560] drivers/gpu/drm/drm_dp_helper.c:492 drm_dp_downstream_max_bpc() warn: ignoring unreachable code.
Date: Tue, 07 Jul 2020 17:07:17 +0300	[thread overview]
Message-ID: <20200707140717.GA2549@kadam> (raw)

[-- Attachment #1: Type: text/plain, Size: 3608 bytes --]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/fallthrough
head:   d7f10c2411ed9283df8d763139de9468b88c89ce
commit: 62708a516a6b158e213c46ff731260cb988dbc11 [144/560] drm: Use fallthrough pseudo-keyword
config: i386-randconfig-m021-20200703 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

smatch warnings:
drivers/gpu/drm/drm_dp_helper.c:492 drm_dp_downstream_max_bpc() warn: ignoring unreachable code.

# https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/commit/?id=62708a516a6b158e213c46ff731260cb988dbc11
git remote add gustavoars-linux https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git
git remote update gustavoars-linux
git checkout 62708a516a6b158e213c46ff731260cb988dbc11
vim +492 drivers/gpu/drm/drm_dp_helper.c

7529d6af1cd16b Mika Kahola         2016-09-09  464  int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
7529d6af1cd16b Mika Kahola         2016-09-09  465  			      const u8 port_cap[4])
7529d6af1cd16b Mika Kahola         2016-09-09  466  {
7529d6af1cd16b Mika Kahola         2016-09-09  467  	int type = port_cap[0] & DP_DS_PORT_TYPE_MASK;
7529d6af1cd16b Mika Kahola         2016-09-09  468  	bool detailed_cap_info = dpcd[DP_DOWNSTREAMPORT_PRESENT] &
7529d6af1cd16b Mika Kahola         2016-09-09  469  		DP_DETAILED_CAP_INFO_AVAILABLE;
7529d6af1cd16b Mika Kahola         2016-09-09  470  	int bpc;
7529d6af1cd16b Mika Kahola         2016-09-09  471  
7529d6af1cd16b Mika Kahola         2016-09-09  472  	if (!detailed_cap_info)
7529d6af1cd16b Mika Kahola         2016-09-09  473  		return 0;
7529d6af1cd16b Mika Kahola         2016-09-09  474  
7529d6af1cd16b Mika Kahola         2016-09-09  475  	switch (type) {
7529d6af1cd16b Mika Kahola         2016-09-09  476  	case DP_DS_PORT_TYPE_VGA:
7529d6af1cd16b Mika Kahola         2016-09-09  477  	case DP_DS_PORT_TYPE_DVI:
7529d6af1cd16b Mika Kahola         2016-09-09  478  	case DP_DS_PORT_TYPE_HDMI:
7529d6af1cd16b Mika Kahola         2016-09-09  479  	case DP_DS_PORT_TYPE_DP_DUALMODE:
7529d6af1cd16b Mika Kahola         2016-09-09  480  		bpc = port_cap[2] & DP_DS_MAX_BPC_MASK;
7529d6af1cd16b Mika Kahola         2016-09-09  481  
7529d6af1cd16b Mika Kahola         2016-09-09  482  		switch (bpc) {
7529d6af1cd16b Mika Kahola         2016-09-09  483  		case DP_DS_8BPC:
7529d6af1cd16b Mika Kahola         2016-09-09  484  			return 8;
7529d6af1cd16b Mika Kahola         2016-09-09  485  		case DP_DS_10BPC:
7529d6af1cd16b Mika Kahola         2016-09-09  486  			return 10;
7529d6af1cd16b Mika Kahola         2016-09-09  487  		case DP_DS_12BPC:
7529d6af1cd16b Mika Kahola         2016-09-09  488  			return 12;
7529d6af1cd16b Mika Kahola         2016-09-09  489  		case DP_DS_16BPC:
7529d6af1cd16b Mika Kahola         2016-09-09  490  			return 16;
7529d6af1cd16b Mika Kahola         2016-09-09  491  		}
62708a516a6b15 Gustavo A. R. Silva 2020-07-02 @492  		fallthrough;
                                                                ^^^^^^^^^^^

7529d6af1cd16b Mika Kahola         2016-09-09  493  	default:
7529d6af1cd16b Mika Kahola         2016-09-09  494  		return 0;
7529d6af1cd16b Mika Kahola         2016-09-09  495  	}
7529d6af1cd16b Mika Kahola         2016-09-09  496  }

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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             reply	other threads:[~2020-07-07 14:07 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-07 14:07 Dan Carpenter [this message]
2020-07-07 14:07 ` [gustavoars-linux:testing/fallthrough 144/560] drivers/gpu/drm/drm_dp_helper.c:492 drm_dp_downstream_max_bpc() warn: ignoring unreachable code Dan Carpenter
2020-07-07 15:25 ` Gustavo A. R. Silva
2020-07-07 17:19   ` Dan Carpenter
2020-07-07 17:19     ` Dan Carpenter
  -- strict thread matches above, loose matches on Subject: below --
2020-07-03 16:09 kernel test robot

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