diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index 7704b016aed8..a8b12262b3c3 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -590,6 +590,9 @@ static u32 find_burst_size(const u32 burst_lengths, u32 maxburst)
 	if (!maxburst)
 		return 1;
 
+	/* maxburst is a transfer limit, not necessarily a valid bit index. */
+	maxburst = min_t(u32, maxburst, fls(burst_lengths) - 1);
+
 	if (BIT(maxburst) & burst_lengths)
 		return maxburst;