Commit 22d3a200 authored Sep 17, 2007 by Giuliano Pochini Committed by Jaroslav Kysela Oct 16, 2007

[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>

parent 11370ee2

sound/pci/echoaudio/echoaudio_dsp.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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);