dmaengine: sun6i: Fix impossible settings of burst and bus width

In the commit 1f9cd91 ("dmaengine: sun6i: Fix memcpy operation"), the signed values returned by convert_burst() and convert_buswidth() were stored in an unsigned value. Then, these values were considered as errors when non null. As a result, DMA transfers were rejected when the burst or buswidth had values different from 1, as 8 for the burst or 4 for the bus width. Acked-by: Maxime Ripard <[email protected]> Signed-off-by: Jean-Francois Moine <[email protected]> Signed-off-by: Vinod Koul <[email protected]>
chewitt · Apr 26, 2016 · dc6a58c · dc6a58c
1 parent 128fe7e
commit dc6a58c
Showing 1 changed file with 5 additions and 5 deletions.
diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
@@ -281,25 +281,25 @@ static inline int sun6i_dma_cfg_lli(struct sun6i_dma_lli *lli,
 				    dma_addr_t dst, u32 len,
 				    struct dma_slave_config *config)
 {
-	u8 src_width, dst_width, src_burst, dst_burst;
+	s8 src_width, dst_width, src_burst, dst_burst;
 
 	if (!config)
 		return -EINVAL;
 
 	src_burst = convert_burst(config->src_maxburst);
-	if (src_burst)
+	if (src_burst < 0)
 		return src_burst;
 
 	dst_burst = convert_burst(config->dst_maxburst);
-	if (dst_burst)
+	if (dst_burst < 0)
 		return dst_burst;
 
 	src_width = convert_buswidth(config->src_addr_width);
-	if (src_width)
+	if (src_width < 0)
 		return src_width;
 
 	dst_width = convert_buswidth(config->dst_addr_width);
-	if (dst_width)
+	if (dst_width < 0)
 		return dst_width;
 
 	lli->cfg = DMA_CHAN_CFG_SRC_BURST(src_burst) |