dmaengine: Add privatecnt to revert DMA_PRIVATE property

Currently dma_request_channel() set DMA_PRIVATE capability but never
clear it.  So if a public channel was once grabbed by
dma_request_channel(), the device stay PRIVATE forever.  Add
privatecnt member to dma_device to correctly revert it.

[lg@denx.de: fix bad usage of 'chan' in dma_async_device_register]
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

2 files changed, 17 insertions, 0 deletions

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index a41d1ea10fa3..92438e9dacc3 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -507,6 +507,7 @@ struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, v
                          * published in the general-purpose allocator
                          */
                         dma_cap_set(DMA_PRIVATE, device->cap_mask);
+                        device->privatecnt++;
                         err = dma_chan_get(chan);
 
                         if (err == -ENODEV) {
@@ -518,6 +519,8 @@ struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, v
                                        dma_chan_name(chan), err);
                         else
                                 break;
+                        if (--device->privatecnt == 0)
+                                dma_cap_clear(DMA_PRIVATE, device->cap_mask);
                         chan->private = NULL;
                         chan = NULL;
                 }
@@ -537,6 +540,9 @@ void dma_release_channel(struct dma_chan *chan)
         WARN_ONCE(chan->client_count != 1,
                   "chan reference count %d != 1\n", chan->client_count);
         dma_chan_put(chan);
+        /* drop PRIVATE cap enabled by __dma_request_channel() */
+        if (--chan->device->privatecnt == 0)
+                dma_cap_clear(DMA_PRIVATE, chan->device->cap_mask);
         chan->private = NULL;
         mutex_unlock(&dma_list_mutex);
 }
@@ -719,6 +725,8 @@ int dma_async_device_register(struct dma_device *device)
                         }
                 }
         list_add_tail_rcu(&device->global_node, &dma_device_list);
+        if (dma_has_cap(DMA_PRIVATE, device->cap_mask))
+                device->privatecnt++;   /* Always private */
         dma_channel_rebalance();
         mutex_unlock(&dma_list_mutex);
 
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 2afc2c95e42d..2e2aa3df170c 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -202,6 +202,7 @@ struct dma_async_tx_descriptor {
 /**
  * struct dma_device - info on the entity supplying DMA services
  * @chancnt: how many DMA channels are supported
+ * @privatecnt: how many DMA channels are requested by dma_request_channel
  * @channels: the list of struct dma_chan
  * @global_node: list_head for global dma_device_list
  * @cap_mask: one or more dma_capability flags
@@ -224,6 +225,7 @@ struct dma_async_tx_descriptor {
 struct dma_device {
 
         unsigned int chancnt;
+        unsigned int privatecnt;
         struct list_head channels;
         struct list_head global_node;
         dma_cap_mask_t  cap_mask;
@@ -352,6 +354,13 @@ __dma_cap_set(enum dma_transaction_type tx_type, dma_cap_mask_t *dstp)
         set_bit(tx_type, dstp->bits);
 }
 
+#define dma_cap_clear(tx, mask) __dma_cap_clear((tx), &(mask))
+static inline void
+__dma_cap_clear(enum dma_transaction_type tx_type, dma_cap_mask_t *dstp)
+{
+        clear_bit(tx_type, dstp->bits);
+}
+
 #define dma_cap_zero(mask) __dma_cap_zero(&(mask))
 static inline void __dma_cap_zero(dma_cap_mask_t *dstp)
 {