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| author | Dan Williams <dan.j.williams@intel.com> | 2009-01-06 11:38:21 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-01-06 11:38:21 -0700 |
| commit | 864498aaa9fef69ee166da023d12413a7776342d (patch) | |
| tree | 023d6bfc15ba192c1a92caab3ff7525a84e409fc /include/linux/dmaengine.h | |
| parent | 41d5e59c1299f27983977bcfe3b360600996051c (diff) | |
| download | lwn-864498aaa9fef69ee166da023d12413a7776342d.tar.gz lwn-864498aaa9fef69ee166da023d12413a7776342d.zip | |
dmaengine: use idr for registering dma device numbers
This brings some predictability to dma device numbers, i.e. an rmmod/insmod
cycle may now result in /sys/class/dma/dma0chan0 being restored rather than
/sys/class/dma/dma1chan0 appearing.
Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/dmaengine.h')
| -rw-r--r-- | include/linux/dmaengine.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index d6b6bff355f4..64dea2ab326c 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -140,10 +140,14 @@ struct dma_chan { * struct dma_chan_dev - relate sysfs device node to backing channel device * @chan - driver channel device * @device - sysfs device + * @dev_id - parent dma_device dev_id + * @idr_ref - reference count to gate release of dma_device dev_id */ struct dma_chan_dev { struct dma_chan *chan; struct device device; + int dev_id; + atomic_t *idr_ref; }; static inline const char *dma_chan_name(struct dma_chan *chan) |