[PATCH] [v2] dmaengine: tegra20: Fix runtime PM imbalance on error

[Dinghao Liu]

pm_runtime_get_sync() will increase the runtime PM counter
even it returns an error. Thus a pairing decrement is needed
to prevent refcount leak. Fix this by replacing this API with
pm_runtime_resume_and_get(), which will not change the runtime
PM counter on error.

Signed-off-by: Dinghao Liu <dinghao....@zju.edu.cn>
---

Changelog:

v2: - Fix another similar case in tegra_dma_synchronize().
---
 drivers/dma/tegra20-apb-dma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 71827d9b0aa1..b7260749e8ee 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -723,7 +723,7 @@ static void tegra_dma_issue_pending(struct dma_chan *dc)
                goto end;
        }
        if (!tdc->busy) {
-               err = pm_runtime_get_sync(tdc->tdma->dev);
+               err = pm_runtime_resume_and_get(tdc->tdma->dev);
                if (err < 0) {
                        dev_err(tdc2dev(tdc), "Failed to enable DMA\n");
                        goto end;
@@ -818,7 +818,7 @@ static void tegra_dma_synchronize(struct dma_chan *dc)
        struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
        int err;
 
-       err = pm_runtime_get_sync(tdc->tdma->dev);
+       err = pm_runtime_resume_and_get(tdc->tdma->dev);
        if (err < 0) {
                dev_err(tdc2dev(tdc), "Failed to synchronize DMA: %d\n", err);
                return;
-- 
2.17.1