[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: Giuliano Pochini <pochini@shiny.it>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 2 insertions, 2 deletions

diff --git a/sound/pci/echoaudio/echoaudio_dsp.c b/sound/pci/echoaudio/echoaudio_dsp.c
index 42afa837d9b4..e6c100770392 100644
--- a/sound/pci/echoaudio/echoaudio_dsp.c
+++ b/sound/pci/echoaudio/echoaudio_dsp.c
@@ -43,11 +43,11 @@ static int wait_handshake(struct echoaudio *chip)
 {
         int i;
 
-        /* Wait up to 10ms for the handshake from the DSP */
+        /* Wait up to 20ms for the handshake from the DSP */
         for (i = 0; i < HANDSHAKE_TIMEOUT; i++) {
                 /* Look for the handshake value */
+                barrier();
                 if (chip->comm_page->handshake) {
-                        /*if (i)  DE_ACT(("Handshake time: %d\n", i));*/
                         return 0;
                 }
                 udelay(1);