Merge tag 'cleanup-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...

[karo-tx-linux.git] / drivers / dma / dmaengine.c

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 92caad629d996cec8415b5d96dfc10605b127195..ed610b4975186b8e389de7360d4d3c8e6f5785e3 100644 (file)
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -535,6 +535,34 @@ struct dma_chan *dma_get_slave_channel(struct dma_chan *chan)
 }
 EXPORT_SYMBOL_GPL(dma_get_slave_channel);
 
+struct dma_chan *dma_get_any_slave_channel(struct dma_device *device)
+{
+       dma_cap_mask_t mask;
+       struct dma_chan *chan;
+       int err;
+
+       dma_cap_zero(mask);
+       dma_cap_set(DMA_SLAVE, mask);
+
+       /* lock against __dma_request_channel */
+       mutex_lock(&dma_list_mutex);
+
+       chan = private_candidate(&mask, device, NULL, NULL);
+       if (chan) {
+               err = dma_chan_get(chan);
+               if (err) {
+                       pr_debug("%s: failed to get %s: (%d)\n",
+                               __func__, dma_chan_name(chan), err);
+                       chan = NULL;
+               }
+       }
+
+       mutex_unlock(&dma_list_mutex);
+
+       return chan;
+}
+EXPORT_SYMBOL_GPL(dma_get_any_slave_channel);
+
 /**
  * __dma_request_channel - try to allocate an exclusive channel
  * @mask: capabilities that the channel must satisfy