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If a driver does not supply a drain operation for outputs, a default code path will execute msleep(50). Especially for a virtual midi device this severely limmits the throughput. This implementation for the virtual midi driver simply flushes the output workqueue. Signed-off-by: Stefan Sauer <st_kost@gmx.de> Link: https://lore.kernel.org/r/20220106124145.17254-1-st_kost@gmx.de Signed-off-by: Takashi Iwai <tiwai@suse.de>