diff options
Diffstat (limited to 'include/linux/dmaengine.h')
| -rw-r--r-- | include/linux/dmaengine.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 11b15a2e97a0..7927731e3716 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -719,9 +719,14 @@ struct dma_filter { * will just return a simple status code * @device_issue_pending: push pending transactions to hardware * @descriptor_reuse: a submitted transfer can be resubmitted after completion + * @device_release: called sometime atfer dma_async_device_unregister() is + * called and there are no further references to this structure. This + * must be implemented to free resources however many existing drivers + * do not and are therefore not safe to unbind while in use. + * */ struct dma_device { - + struct kref ref; unsigned int chancnt; unsigned int privatecnt; struct list_head channels; @@ -802,6 +807,7 @@ struct dma_device { dma_cookie_t cookie, struct dma_tx_state *txstate); void (*device_issue_pending)(struct dma_chan *chan); + void (*device_release)(struct dma_device *dev); }; static inline int dmaengine_slave_config(struct dma_chan *chan, |