1. Apr 23, 2015
    • Takashi Iwai's avatar
      ALSA: core: Use seq_file for text proc file reads · 4adb7bcb
      Takashi Iwai authored
      
      
      seq_file is _the_ standard interface for simple text proc files.
      Though, we still need to support the binary proc files and the text
      file write, and also we need to manage the device disconnection
      gracefully.  Thus this patch just replaces the text file read code
      with seq_file while keeping the rest intact.
      
      snd_iprintf() helper function is now a macro to expand itself to
      seq_printf() to be compatible with the existing code.  The seq_file
      object is stored to the unused entry->rbuffer->buffer pointer.
      
      When the output size is expected to be large (greater than PAGE_SIZE),
      the driver should set entry->size field beforehand.  Then the given
      size will be preallocated and the multiple show calls can be avoided.
      
      Acked-by: default avatarJaroslav Kysela <perex@perex.cz>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      4adb7bcb
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