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    media: tw5864, fc0011: better handle WARN_ON() · f7d84fa7
    Mauro Carvalho Chehab 提交于
    As such macro will check if the expression is true, it may fall through, as
    warned:
    
    In file included from ./include/uapi/linux/stddef.h:1:0,
                     from ./include/linux/stddef.h:4,
                     from ./include/uapi/linux/posix_types.h:4,
                     from ./include/uapi/linux/types.h:13,
                     from ./include/linux/types.h:5,
                     from ./drivers/media/dvb-core/dvb_frontend.h:35,
                     from drivers/media/tuners/fc0011.h:4,
                     from drivers/media/tuners/fc0011.c:20:
    drivers/media/tuners/fc0011.c: In function 'fc0011_set_params':
    ./include/linux/compiler.h:179:22: warning: this statement may fall through [-Wimplicit-fallthrough=]
     # define unlikely(x) __builtin_expect(!!(x), 0)
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~
    ./include/asm-generic/bug.h:109:2: note: in expansion of macro 'unlikely'
      unlikely(__ret_warn_on);     \
      ^~~~~~~~
    drivers/media/tuners/fc0011.c:344:3: note: in expansion of macro 'WARN_ON'
       WARN_ON(1);
       ^~~~~~~
    drivers/media/tuners/fc0011.c:345:2: note: here
      case 0:
      ^~~~
    In file included from ./include/uapi/linux/stddef.h:1:0,
                     from ./include/linux/stddef.h:4,
                     from ./include/uapi/linux/posix_types.h:4,
                     from ./include/uapi/linux/types.h:13,
                     from ./include/linux/types.h:5,
                     from ./include/linux/list.h:4,
                     from ./include/linux/module.h:9,
                     from drivers/media/pci/tw5864/tw5864-video.c:17:
    drivers/media/pci/tw5864/tw5864-video.c: In function 'tw5864_fmt_vid_cap':
    ./include/linux/compiler.h:179:22: warning: this statement may fall through [-Wimplicit-fallthrough=]
     # define unlikely(x) __builtin_expect(!!(x), 0)
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~
    ./include/asm-generic/bug.h:68:2: note: in expansion of macro 'unlikely'
      unlikely(__ret_warn_on);    \
      ^~~~~~~~
    drivers/media/pci/tw5864/tw5864-video.c:547:3: note: in expansion of macro 'WARN_ON_ONCE'
       WARN_ON_ONCE(1);
       ^~~~~~~~~~~~
    drivers/media/pci/tw5864/tw5864-video.c:548:2: note: here
      case STD_NTSC:
      ^~~~
    
    On both cases, it means an error, so, let's return an error
    code, to make gcc happy.
    Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>
    Acked-by: NMichael Büsch <m@bues.ch>
    Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>
    f7d84fa7
fc0011.c 12.4 KB