Blackfin arch: dma code: cannot simply OR the ndsize

cannot simply OR the ndsize ... need to clear out the old value first

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/blackfin/include/asm/dma.h b/arch/blackfin/include/asm/dma.h
index 264feb4eb175..f58ca64d729c 100644
--- a/arch/blackfin/include/asm/dma.h
+++ b/arch/blackfin/include/asm/dma.h
@@ -205,7 +205,9 @@ static inline unsigned long get_dma_curr_addr(unsigned int channel)
 
 static inline void set_dma_sg(unsigned int channel, struct dmasg *sg, int ndsize)
 {
-        dma_ch[channel].regs->cfg |= ((ndsize & 0x0F) << 8);
+        dma_ch[channel].regs->cfg =
+                (dma_ch[channel].regs->cfg & ~(0xf << 8)) |
+                ((ndsize & 0xf) << 8);
         dma_ch[channel].regs->next_desc_ptr = sg;
 }