dmaengine: increment privatecnt when using dma_get_any_slave_channel

Channels allocated via dma_get_any_slave_channel were not increasing
the counter tracking private allocations.  When these channels were
released, privatecnt may erroneously fall to zero.  The DMA device
would then lose its DMA_PRIVATE cap and fail to allocate future private
channels (via private_candidate) as any allocations still outstanding
would incorrectly be seen as public allocations.

Signed-off-by: Christopher Freeman <cfreeman@nvidia.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 0e035a8cf401..2890d744bb1b 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -571,11 +571,15 @@ struct dma_chan *dma_get_any_slave_channel(struct dma_device *device)
 
         chan = private_candidate(&mask, device, NULL, NULL);
         if (chan) {
+                dma_cap_set(DMA_PRIVATE, device->cap_mask);
+                device->privatecnt++;
                 err = dma_chan_get(chan);
                 if (err) {
                         pr_debug("%s: failed to get %s: (%d)\n",
                                 __func__, dma_chan_name(chan), err);
                         chan = NULL;
+                        if (--device->privatecnt == 0)
+                                dma_cap_clear(DMA_PRIVATE, device->cap_mask);
                 }
         }