| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.6 169/203] ALSA: au88x0: Fix calculation in vortex_wtdma_bufshift() | Date | Mon, 25 Jul 2016 13:56:24 -0700 |
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4.6-stable review patch. If anyone has any objections, please let me know.
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From: Takashi Iwai <tiwai@suse.de>
commit 62db7152c924e4c060e42b34a69cd39658e8a0dc upstream.
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> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- sound/pci/au88x0/au88x0_core.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
--- a/sound/pci/au88x0/au88x0_core.c +++ b/sound/pci/au88x0/au88x0_core.c @@ -1444,9 +1444,8 @@ static int vortex_wtdma_bufshift(vortex_ 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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