Commit fa48403a authored by Takashi Iwai's avatar Takashi Iwai Committed by Sasha Levin

ALSA: au88x0: Fix calculation in vortex_wtdma_bufshift()

[ Upstream commit 62db7152 ]

vortex_wtdma_bufshift() function does calculate the page index
wrongly, first masking then shift, which always results in zero.
The proper computation is to first shift, then mask.
Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 9f0a4f41
......@@ -1442,9 +1442,8 @@ static int vortex_wtdma_bufshift(vortex_t * vortex, int wtdma)
int page, p, pp, delta, i;
page =
(hwread(vortex->mmio, VORTEX_WTDMA_STAT + (wtdma << 2)) &
WT_SUBBUF_MASK)
>> WT_SUBBUF_SHIFT;
(hwread(vortex->mmio, VORTEX_WTDMA_STAT + (wtdma << 2))
>> WT_SUBBUF_SHIFT) & WT_SUBBUF_MASK;
if (dma->nr_periods >= 4)
delta = (page - dma->period_real) & 3;
else {
......
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