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| author | Jon Mason <jon.mason@intel.com> | 2012-11-11 23:03:20 +0000 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2013-01-07 22:05:05 -0800 |
| commit | 944ea4dd38b8575e30a5699633c81945bff1864d (patch) | |
| tree | 7883205efd57c7c1e95ad2cb2bed59bde165ecc8 /include/linux/dmaengine.h | |
| parent | e4d43c1764bc3ee1150f24e530db2b5b23e91425 (diff) | |
| download | lwn-944ea4dd38b8575e30a5699633c81945bff1864d.tar.gz lwn-944ea4dd38b8575e30a5699633c81945bff1864d.zip | |
dmatest: Fix NULL pointer dereference on ioat
device_control is an optional and not implemented in all DMA drivers.
Any calls to these will result in a NULL pointer dereference. dmatest
makes two of these calls when completing the kernel thread and removing
the module. These are corrected by calling the dmaengine_device_control
wrapper and checking for a non-existant device_control function pointer
there.
Signed-off-by: Jon Mason <jon.mason@intel.com>
CC: Vinod Koul <vinod.koul@intel.com>
CC: Dan Williams <djbw@fb.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Diffstat (limited to 'include/linux/dmaengine.h')
| -rw-r--r-- | include/linux/dmaengine.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 3aa76dbed166..be6e95395b11 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -608,7 +608,10 @@ static inline int dmaengine_device_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg) { - return chan->device->device_control(chan, cmd, arg); + if (chan->device->device_control) + return chan->device->device_control(chan, cmd, arg); + else + return -ENOSYS; } static inline int dmaengine_slave_config(struct dma_chan *chan, |