diff options
Diffstat (limited to 'drivers/dma/dmaengine.c')
| -rw-r--r-- | drivers/dma/dmaengine.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 21eb896f4dfd..9d31d5eb95c1 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -58,6 +58,7 @@ #include <linux/jiffies.h> #include <linux/rculist.h> #include <linux/idr.h> +#include <linux/slab.h> static DEFINE_MUTEX(dma_list_mutex); static LIST_HEAD(dma_device_list); @@ -975,7 +976,9 @@ void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx, struct dma_chan *chan) { tx->chan = chan; + #ifndef CONFIG_ASYNC_TX_DISABLE_CHANNEL_SWITCH spin_lock_init(&tx->lock); + #endif } EXPORT_SYMBOL(dma_async_tx_descriptor_init); @@ -1008,7 +1011,7 @@ EXPORT_SYMBOL_GPL(dma_wait_for_async_tx); */ void dma_run_dependencies(struct dma_async_tx_descriptor *tx) { - struct dma_async_tx_descriptor *dep = tx->next; + struct dma_async_tx_descriptor *dep = txd_next(tx); struct dma_async_tx_descriptor *dep_next; struct dma_chan *chan; @@ -1016,7 +1019,7 @@ void dma_run_dependencies(struct dma_async_tx_descriptor *tx) return; /* we'll submit tx->next now, so clear the link */ - tx->next = NULL; + txd_clear_next(tx); chan = dep->chan; /* keep submitting up until a channel switch is detected @@ -1024,14 +1027,14 @@ void dma_run_dependencies(struct dma_async_tx_descriptor *tx) * processing the interrupt from async_tx_channel_switch */ for (; dep; dep = dep_next) { - spin_lock_bh(&dep->lock); - dep->parent = NULL; - dep_next = dep->next; + txd_lock(dep); + txd_clear_parent(dep); + dep_next = txd_next(dep); if (dep_next && dep_next->chan == chan) - dep->next = NULL; /* ->next will be submitted */ + txd_clear_next(dep); /* ->next will be submitted */ else dep_next = NULL; /* submit current dep and terminate */ - spin_unlock_bh(&dep->lock); + txd_unlock(dep); dep->tx_submit(dep); } |