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authorTakashi Iwai <tiwai@suse.de>2016-06-29 15:23:08 +0200
committerTakashi Iwai <tiwai@suse.de>2016-06-29 15:26:12 +0200
commit62db7152c924e4c060e42b34a69cd39658e8a0dc (patch)
treea6c344f3ae277352df3f06b24a8b6eb6c9f30663 /sound
parent6858107e78b4ecb9f244db814ffbdba1b5ce759b (diff)
ALSA: au88x0: Fix calculation in vortex_wtdma_bufshift()
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: Dan Carpenter <dan.carpenter@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/pci/au88x0/au88x0_core.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/sound/pci/au88x0/au88x0_core.c b/sound/pci/au88x0/au88x0_core.c
index 4a054d720112..d3125c169684 100644
--- a/sound/pci/au88x0/au88x0_core.c
+++ b/sound/pci/au88x0/au88x0_core.c
@@ -1444,9 +1444,8 @@ 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 {