From c95905a6a36858122afe1c334eba64499b39d7a2 Mon Sep 17 00:00:00 2001 From: Guennadi Liakhovetski Date: Wed, 18 Sep 2013 09:33:08 +0200 Subject: [PATCH] DMA: ste_dma40: use a power of 2 check dst_addr_width and src_addr_width should be a power of 2. Currently the driver checks, that they both lie between 1 and 8 and that they are equal to 1 or even. This however leaves an invalid value of 6 uncaught. Use an explicit power of 2 check instead. Signed-off-by: Guennadi Liakhovetski [typo fix on changelog] Signed-off-by: Vinod Koul --- drivers/dma/ste_dma40.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index 82d2b97..3d5e4ee 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -2796,8 +2797,8 @@ static int d40_set_runtime_config(struct dma_chan *chan, src_addr_width > DMA_SLAVE_BUSWIDTH_8_BYTES || dst_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED || dst_addr_width > DMA_SLAVE_BUSWIDTH_8_BYTES || - ((src_addr_width > 1) && (src_addr_width & 1)) || - ((dst_addr_width > 1) && (dst_addr_width & 1))) + !is_power_of_2(src_addr_width) || + !is_power_of_2(dst_addr_width)) return -EINVAL; cfg->src_info.data_width = src_addr_width; -- 2.7.4