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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2013-01-10 10:52:58 +0200
committerVinod Koul <vinod.koul@intel.com>2013-01-12 05:07:21 -0800
commitf44b92f4dd2f6caf326b149e0b9636a1d4e50184 (patch)
tree500c283c06fdcb6194f5ec8c4347875a0cdff441 /drivers/dma/dw_dmac.c
parent0e7264cc79a2d5c0ffa32c08d8f1cf84b2ec4fef (diff)
downloadlinux-f44b92f4dd2f6caf326b149e0b9636a1d4e50184.tar.gz
dma: dw_dmac: check direction properly in dw_dma_cyclic_prep
dma_transfer_direction is a normal enum. It means we can't usually use the values as bit fields. Let's adjust this check and move it above the usage of the direction parameter, due to the nature of the following usage of it. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/dw_dmac.c')
-rw-r--r--drivers/dma/dw_dmac.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 6c9e20a7ff5..ca996bc5cca 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1355,6 +1355,9 @@ struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
retval = ERR_PTR(-EINVAL);
+ if (unlikely(!is_slave_direction(direction)))
+ goto out_err;
+
if (direction == DMA_MEM_TO_DEV)
reg_width = __ffs(sconfig->dst_addr_width);
else
@@ -1369,8 +1372,6 @@ struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
goto out_err;
if (unlikely(buf_addr & ((1 << reg_width) - 1)))
goto out_err;
- if (unlikely(!(direction & (DMA_MEM_TO_DEV | DMA_DEV_TO_MEM))))
- goto out_err;
retval = ERR_PTR(-ENOMEM);