[PATCH] dmaengine: tegra-apb: fix reference leak in tegra_dma_issue_pending and tegra_dma_synchronize

[Qinglang Miao]

pm_runtime_get_sync will increment pm usage counter even it
failed. Forgetting to putting operation will result in a
reference leak here.

A new function pm_runtime_resume_and_get is introduced in
[0] to keep usage counter balanced. So We fix the reference
leak by replacing it with new funtion.

[0] dd8088d5a896 ("PM: runtime: Add  pm_runtime_resume_and_get to deal with 
usage counter")

Fixes: 84a3f375eea9 ("dmaengine: tegra-apb: Keep clock enabled only during of 
DMA transfer")
Fixes: 664475cffb8c ("dmaengine: tegra-apb: Ensure that clock is enabled during 
of DMA synchronization")
Reported-by: Hulk Robot <hul...@huawei.com>
Signed-off-by: Qinglang Miao <miaoqingl...@huawei.com>
---
 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 71827d9b0..b7260749e 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;
-- 
2.23.0