fsldma: fix off by one in dma_halt

Prevent dev_err from firing even if we successfully detected 'dma-idle'
before the full 1ms timeout has elapsed.

Acked-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 70126a6..86d6da4 100644 (file)
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -158,7 +158,8 @@ static void dma_start(struct fsl_dma_chan *fsl_chan)
 
 static void dma_halt(struct fsl_dma_chan *fsl_chan)
 {
-       int i = 0;
+       int i;
+
        DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr,
                DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) | FSL_DMA_MR_CA,
                32);
@@ -166,8 +167,11 @@ static void dma_halt(struct fsl_dma_chan *fsl_chan)
                DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32) & ~(FSL_DMA_MR_CS
                | FSL_DMA_MR_EMS_EN | FSL_DMA_MR_CA), 32);
 
-       while (!dma_is_idle(fsl_chan) && (i++ < 100))
+       for (i = 0; i < 100; i++) {
+               if (dma_is_idle(fsl_chan))
+                       break;
                udelay(10);
+       }
        if (i >= 100 && !dma_is_idle(fsl_chan))
                dev_err(fsl_chan->dev, "DMA halt timeout!\n");
 }