Re: [PATCH net 2/3] net: ipa: use state to determine channel command success

[kernel test robot]

Hi Alex,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net/master]

url:    https://github.com/0day-ci/linux/commits/Alex-Elder/net-ipa-GSI-interrupt-handling-fixes/20201223-020409
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git 2575bc1aa9d52a62342b57a0b7d0a12146cf6aed
config: arm64-allyesconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/4073b68cee8a9d0dbb83080db22255fc9b9d7fd5
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Alex-Elder/net-ipa-GSI-interrupt-handling-fixes/20201223-020409
        git checkout 4073b68cee8a9d0dbb83080db22255fc9b9d7fd5
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

   drivers/net/ipa/gsi.c: In function 'gsi_channel_alloc_command':
>> drivers/net/ipa/gsi.c:496:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
     496 |  int ret;
         |      ^~~
   drivers/net/ipa/gsi.c: In function 'gsi_channel_start_command':
   drivers/net/ipa/gsi.c:524:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
     524 |  int ret;
         |      ^~~
   drivers/net/ipa/gsi.c: In function 'gsi_channel_stop_command':
   drivers/net/ipa/gsi.c:552:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
     552 |  int ret;
         |      ^~~
   drivers/net/ipa/gsi.c: In function 'gsi_channel_reset_command':
   drivers/net/ipa/gsi.c:591:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
     591 |  int ret;
         |      ^~~
   drivers/net/ipa/gsi.c: In function 'gsi_channel_de_alloc_command':
   drivers/net/ipa/gsi.c:620:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
     620 |  int ret;
         |      ^~~


vim +/ret +496 drivers/net/ipa/gsi.c

650d1603825d8ba Alex Elder 2020-03-05  489  
650d1603825d8ba Alex Elder 2020-03-05  490  /* Allocate GSI channel in NOT_ALLOCATED state */
650d1603825d8ba Alex Elder 2020-03-05  491  static int gsi_channel_alloc_command(struct gsi *gsi, u32 channel_id)
650d1603825d8ba Alex Elder 2020-03-05  492  {
650d1603825d8ba Alex Elder 2020-03-05  493  	struct gsi_channel *channel = &gsi->channel[channel_id];
a442b3c7554898f Alex Elder 2020-06-30  494  	struct device *dev = gsi->dev;
a2003b303875b41 Alex Elder 2020-04-30  495  	enum gsi_channel_state state;
650d1603825d8ba Alex Elder 2020-03-05 @496  	int ret;
650d1603825d8ba Alex Elder 2020-03-05  497  
650d1603825d8ba Alex Elder 2020-03-05  498  	/* Get initial channel state */
a2003b303875b41 Alex Elder 2020-04-30  499  	state = gsi_channel_state(channel);
a442b3c7554898f Alex Elder 2020-06-30  500  	if (state != GSI_CHANNEL_STATE_NOT_ALLOCATED) {
f8d3bdd561a7c95 Alex Elder 2020-11-19  501  		dev_err(dev, "channel %u bad state %u before alloc\n",
f8d3bdd561a7c95 Alex Elder 2020-11-19  502  			channel_id, state);
650d1603825d8ba Alex Elder 2020-03-05  503  		return -EINVAL;
a442b3c7554898f Alex Elder 2020-06-30  504  	}
650d1603825d8ba Alex Elder 2020-03-05  505  
650d1603825d8ba Alex Elder 2020-03-05  506  	ret = gsi_channel_command(channel, GSI_CH_ALLOCATE);
a2003b303875b41 Alex Elder 2020-04-30  507  
4073b68cee8a9d0 Alex Elder 2020-12-22  508  	/* If successful the channel state will have changed */
a2003b303875b41 Alex Elder 2020-04-30  509  	state = gsi_channel_state(channel);
4073b68cee8a9d0 Alex Elder 2020-12-22  510  	if (state == GSI_CHANNEL_STATE_ALLOCATED)
4073b68cee8a9d0 Alex Elder 2020-12-22  511  		return 0;
4073b68cee8a9d0 Alex Elder 2020-12-22  512  
f8d3bdd561a7c95 Alex Elder 2020-11-19  513  	dev_err(dev, "channel %u bad state %u after alloc\n",
f8d3bdd561a7c95 Alex Elder 2020-11-19  514  		channel_id, state);
650d1603825d8ba Alex Elder 2020-03-05  515  
4073b68cee8a9d0 Alex Elder 2020-12-22  516  	return -EIO;
650d1603825d8ba Alex Elder 2020-03-05  517  }
650d1603825d8ba Alex Elder 2020-03-05  518  

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