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dmaengine: ensure dmaengine helpers check valid callback 

dmaengine has various device callbacks and exposes helper
functions to invoke these. These helpers should check if channel,
device and callback is valid or not before invoking them.

Reported-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Vinod Koul 2016-04-12 21:07:06 +05:30
parent b2d8984f3e
commit 757d12e584
1 changed files with 19 additions and 1 deletions
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20
include/linux/dmaengine.h
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@ -804,6 +804,9 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_single(
sg_dma_address(&sg) = buf;
sg_dma_len(&sg) = len;
if (!chan || !chan->device || !chan->device->device_prep_slave_sg)
return NULL;
return chan->device->device_prep_slave_sg(chan, &sg, 1,
dir, flags, NULL);
}
@ -812,6 +815,9 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
enum dma_transfer_direction dir, unsigned long flags)
{
if (!chan || !chan->device || !chan->device->device_prep_slave_sg)
return NULL;
return chan->device->device_prep_slave_sg(chan, sgl, sg_len,
dir, flags, NULL);
}
@ -823,6 +829,9 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_rio_sg(
enum dma_transfer_direction dir, unsigned long flags,
struct rio_dma_ext *rio_ext)
{
if (!chan || !chan->device || !chan->device->device_prep_slave_sg)
return NULL;
return chan->device->device_prep_slave_sg(chan, sgl, sg_len,
dir, flags, rio_ext);
}
@ -833,6 +842,9 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_cyclic(
size_t period_len, enum dma_transfer_direction dir,
unsigned long flags)
{
if (!chan || !chan->device || !chan->device->device_prep_dma_cyclic)
return NULL;
return chan->device->device_prep_dma_cyclic(chan, buf_addr, buf_len,
period_len, dir, flags);
}
@ -841,6 +853,9 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_interleaved_dma(
struct dma_chan *chan, struct dma_interleaved_template *xt,
unsigned long flags)
{
if (!chan || !chan->device || !chan->device->device_prep_interleaved_dma)
return NULL;
return chan->device->device_prep_interleaved_dma(chan, xt, flags);
}
@ -848,7 +863,7 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_memset(
struct dma_chan *chan, dma_addr_t dest, int value, size_t len,
unsigned long flags)
{
if (!chan || !chan->device)
if (!chan || !chan->device || !chan->device->device_prep_dma_memset)
return NULL;
return chan->device->device_prep_dma_memset(chan, dest, value,
@ -861,6 +876,9 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_sg(
struct scatterlist *src_sg, unsigned int src_nents,
unsigned long flags)
{
if (!chan || !chan->device || !chan->device->device_prep_dma_sg)
return NULL;
return chan->device->device_prep_dma_sg(chan, dst_sg, dst_nents,
src_sg, src_nents, flags);
}