[ALSA] echoaudio - Add barrier() to prevent compiler optimization
This patch adds a barrier() to prevent the compiler from moving the read outside of the loop. It also fixes a comment. Signed-off-by: NGiuliano Pochini <pochini@shiny.it> Signed-off-by: NTakashi Iwai <tiwai@suse.de> Signed-off-by: NJaroslav Kysela <perex@suse.cz>
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