dmaengine: Add might_sleep() to dmaengine_synchronize()

commit b1d6ab1aa8cdc23b89bcd578ea8d5e3c501a13d9 upstream.

Implementations of dmaengine_synchronize() are allowed to sleep, hence the
function must not be called to from atomic context. Add might_sleep() to
dmaengine_synchronize() to make it easier to detect non-compliant callers.

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 6a44358af87bcf05d7c474b4e53d1120dd5975ef..95e689276ef122852b62cb400a8b41b455547e6e 100644 (file)
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -836,6 +836,8 @@ static inline int dmaengine_terminate_async(struct dma_chan *chan)
  */
 static inline void dmaengine_synchronize(struct dma_chan *chan)
 {
+       might_sleep();
+
        if (chan->device->device_synchronize)
                chan->device->device_synchronize(chan);
 }