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| author | Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2013-09-18 09:33:08 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2013-10-07 07:41:39 +0530 |
| commit | c95905a6a36858122afe1c334eba64499b39d7a2 (patch) | |
| tree | 1f98979430da6498536d935e52a763bdcd1262fa /drivers/dma/ste_dma40.c | |
| parent | 717d818169e5d5672fb81bc7357e9bb265d1e228 (diff) | |
| download | op-kernel-dev-c95905a6a36858122afe1c334eba64499b39d7a2.zip op-kernel-dev-c95905a6a36858122afe1c334eba64499b39d7a2.tar.gz | |
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 <g.liakhovetski+renesas@gmail.com>
[typo fix on changelog]
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/ste_dma40.c')
| -rw-r--r-- | drivers/dma/ste_dma40.c | 5 |
1 files 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 <linux/platform_device.h> #include <linux/clk.h> #include <linux/delay.h> +#include <linux/log2.h> #include <linux/pm.h> #include <linux/pm_runtime.h> #include <linux/err.h> @@ -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; |
