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>

parent 6858107e

sound/pci/au88x0/au88x0_core.c

+2 −3

Original line number	Diff line number	Diff line
		@@ -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 {